Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try! A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
[need math help] Study buddies part #3
9514 1404 393
Answer:
a) at t=12, Whitney is speeding up
b) 13/48 = 0.2704833 . . . miles/min; not a good measure
Step-by-step explanation:
a) At t=12, Whitney's velocity is -0.2 miles/min and is decreasing. That is, the magnitude of her velocity (speed) is increasing. Whitney is speeding up at t=12.
__
b) The (signed) area under the curve, divided by the time period (24 min) will give Whitney's average velocity. It can be found by using the formulas for area of a trapezoid and triangle.
distance 0-11 = 1/2(11 +3)(0.8) = 5.6 miles
distance 11-16 = 1/2(5)(-0.6) = -1.5 miles
distance 16-24 = 1/2(8)(0.6 = 2.4 miles
Whitney's average velocity is ...
(5.6 -1.5 +2.4)mi/(24 min) = 6.5 mi/(24 min) = (13/48) mi/min ≈ 0.270 mi/min
The laws of physics tell us that no work is being done if velocity is constant. Hence, the strenuousness of Whitney's pedaling depends on the acceleration she is maintaining. The average velocity measure tells nothing of that, so is a poor measure of how strenuously Whitney is pedaling.
which of the following equations would contain the point (4,12) A. y=3/4x+6 B. y=-1/2x-14 C. y=1/2x+10 D. y=-2x+4
Select all the expressions that are the result of decreasing x by 80%
Please use the photo, also please don't give me a file cause I know it's a virus
Answer:
A,B,E or 1,2,5
if its letters or numbers.
Step-by-step explanat
The expressions that are the result of decreasing x by 80% will be (1 - 0.80)x, x - (80/100)x, and (20/100)x. Then the correct options are A, C, and E.
What is the percentage?The quantity of anything is stated as though it were a fraction of a hundred. A quarter of 100 can be used to express the ratio. Per 100 is what the term percent signifies. The symbol ‘%’ is used to symbolize it.
The expressions that are the result of decreasing x by 80%.
We know that if something is decreased by a percentage p% then the percentage is written as (1 - p%). Then the expression is written as,
⇒ [(100 - 80) / 100]x
Then the expression can be written as,
⇒ [(100 - 80) / 100]x
⇒ x - (80/100)x
⇒ x - 0.80x
⇒ (1 - 0.80)x
⇒ 0.20x
⇒ (20/100)x
The expressions that are the result of decreasing x by 80% will be (1 - 0.80)x, x - (80/100)x, and (20/100)x. Then the correct options are A, C, and E.
More about the percentage link is given below.
https://brainly.com/question/8011401
#SPJ2
Of the numbers 2, 3, or 4, which is a solution of the inequality x - 1 > 2?
Answer:
4
Step-by-step explanation:
x-1 must be greater than 2.
2-1 is lesser than 2.
3-1 is equal to 2.
4-1 is greater than 2, so the answer is 4.
increase 80 in the ratio of 3:2
Answer:
Ratios describe proportions. We can always multiply across ratios, or divide across them (as long as we do it to all of them). For example, the ratio 3 : 2 is the same as 6 : 4 and 300 : 200. Accuracy Tip.
Step-by-step explanation:
A 12 sided solid has equal-sized faces numbered 1 to 12 Find the the Probability number less than 5?
18. How many kilograms are in 21,500 grams?
Answer:
0,0215
Step-by-step explanation:
What is the main problem with this paragraph
Thesis statement: Stores that resell used video games should offer at least 30 percent of the sale price to sellers.
Main points:
More people will sell used games.
More people will buy new games.
The store will make money.
Conclusion: It just makes sense that happy sellers will sell back more used games They'll also be willing to buy more new games, knowing they can sell them back for a good price. This will all lead to more profit for the store. It is a problem that has a simple solution that will benefit everyone involved.
A. It does not restate the thesis.
B. It does not have a satisfying close.
C. It adds new information.
D. It is missing one of the main points
Answer:
A
Step-by-step explanation:
It never restates the thesis, in which you are required to in anything resembling a formative, constructed response, or an essay.
I need help with this question
Answer:
A would be the answer
Step-by-step explanation:
Hope it was helpful .
Suppose that the weights of 3200 registered female Great Danes in the United States are
distributed normally with a mean of 115 lb. and a standard deviation of 5.4 lb.
Approximately how many of the Great Danes weigh more than 125.8 lbs.? Round to the nearest
whole number.
Answer:
794
Step-by-step explanation:
125.8•5.5+115
679.3+115
794
I hope this helps you
Approximately 73 Great Danes weigh more than 125.8 lbs.
Mean [tex]\mu[/tex]=115 lb.
Standard deviation [tex]\sigma[/tex] =5.4 lb.
What is a z-score?Z-score depicts how much a given value differs from the standard deviation.
[tex]z=\frac{x-\mu}{\sigma}[/tex]
[tex]z=\frac{125.8-115}{5.4}[/tex]
[tex]z=2[/tex]
From the standard normal table P-value corresponding to z=2 i.e. P(x>125.8) = 0.02275
Total population =3200
3200*0.02275 = 72.8 ≈73
Thus, approximately 73 Great Danes weigh more than 125.8 lbs.
To get more about the z-score visit:
https://brainly.com/question/25638875
1.Which is greater 2/4 or ¼?
2.Which is the least 3/6 or 3/7?
3.Which is greater 7/21 or ⅓ ?
HELPPPP PLEASE, IF YOU GIVE ME AN ANSWER GARBAGE I WILL REPORT YOU
THANK, :)
what is a diagonal through the interior of the cube?
Answer:
A cube has 6 faces and on each face there are two diagonals joining nonadjacent vertices and there are 4 diagonals through the interior of the cube. Thus in total there are 6×2+4=16 diagonals in a cube. In this cube, the diagonals through the interior of the cube are. AH, CF, DE and BG.
Step-by-step explanation:
Which would be the best method to use to solve the following equation. Explain your reasoning.
Methods:
Factoring
Square root Property
Completing the Square
Quadratic Formula
1. 3x^2 - 192 = 0
Method:
Why:
Answer:
x = ±8
Step-by-step explanation:
The given equation is :
[tex]3x^2-192=0[/tex]
We can use the Square root Property to solve it.
Adding 192 both sides,
[tex]3x^2-192=0\\\\3x^2=192[/tex]
Dividing both sides by 3.
[tex]x^2=64\\\\x=\sqrt{64} \\\\x=\pm 8[/tex]
So, the value of x is equal to +8 and -8.
PLEASE HELP ME!!! AND PLEASE TELL ME THE CORECT ANSWER. THIS WILL BE WORTH 20 POINTS!!!
Answer:
45units²
Step-by-step explanation:
Triangle area = (1/2)(base length)(perpendicular height)
= (1/2)(6)(15)
=3(15)
=45units²
Enter the equation of the circle with the given center and radius. Center: (−2, −5); radius= 1
Answer:
[tex](x + 2)^2 + (y + 5)^2 = 1[/tex]
Step-by-step explanation:
Equation of a circle:
The equation of a circle with center [tex](x_0,y_0)[/tex] and radius r is given by:
[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]
Center: (−2, −5); radius= 1
This means that [tex]x_0 = -2, y_0 = -5, r = 1[/tex]. So
[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]
[tex](x - (-2))^2 + (y - (-5))^2 = 1^2[/tex]
[tex](x + 2)^2 + (y + 5)^2 = 1[/tex]
This is the equation of the circle.
If 2 power x= 1, then find the value of x.
Answer:
x = 0
Step-by-step explanation:
2^x = 1
The only way a number can equal one when there's an exponent is when the exponent is 0
x = 0
2^0 = 1
the probabilities that amy and tess will arrive at party on time are 2/3 and 3/4 respectively. Find the probability that a. amy will arrive on time while tess is not
Answer:
1/6
Step-by-step explanation:
Probability that any arrives on time = 2/3
Probability that teaa arrives on time = 3/4
Probability that teas will not arrive in time = 1 - P(tess arrives on time) = 1 - 3/4 = 1/4
Hence,
The probability that Amy arrives in time and tess does not equals
2/3 * 1/4 = (2*1) / (3*4) = 2 / 12 = 1/6
Using it's concept, it is found that there is a 0.1667 = 16.67% probability that Amy will arrive on time while Tess will not.
What is a probability?A probability is given by the number of desired outcomes divided by the number of total outcomes.
In this problem:
The probability that Amy arrives on time is of 2/3.The probability that Tess does not arrive on time is of 1/4.Since they are independent, we multiply them, hence:
[tex]P = \frac{2}{3} \times \frac{1}{4} = \frac{2}{12} = 0.1667[/tex]
0.1667 = 16.67% probability that Amy will arrive on time while Tess will not.
More can be learned about probabilities at https://brainly.com/question/14398287
A construction worker earned $64 in a week. If he worked eight hours in one week, how much money did he earn per hour?
Answer:
X=8
Step-by-step explanation:
64 Divided by Eight equals Eight.
Because he worked eight hours that week and earned $64 so divide that up by eight then you got your answer.
Which is an equation in terms of x and y for this function? graph of a function is a line that passes through the coordinates (2, 11) and (8, 14).
Answer:
y = 1/2x + 10
Step-by-step explanation:
I'm not sure if this is right but:
First you work out the gradient of the line which is the difference in y divided by the difference in x:
Gradient = (14 - 11) ÷ (8 - 2) = 3 ÷ 6 = 1/2
the gradient is 1/2 so you'd write that as: y= 1/2x + c
Then you need to work out the y-intercept ( c )
You do this by substitution:
14 = 1/2(8) + c
14 = 4 + c
c = 10
So the y-intercept is 10 so you'd write that as:
y = 1/2x + 10
Della has over 500500500 songs on her mobile phone, and she wants to estimate what proportion of the songs are by a female artist. She takes an SRS of 505050 songs on her phone and finds that 202020 of the songs sampled are by a female artist. Based on this sample, which of the following is a 99\%99%99, percent confidence interval for the proportion of songs on her phone that are by a female artist?
Answer: 0.40 2.576 √0.40(0.60)
——————
50
Step-by-step explanation:
Put a upside down T which is the Plus-minus sign in between .40 and 2.576
The 99% confidence interval for the proportion of songs on her phone that are by a female artist will be given below. Then the correct option is A.
[tex]0.4 \pm 2.58 \times \dfrac{0.4(1-0.4)}{50}[/tex]
What is a normal distribution?It is also called the Gaussian Distribution. It is the most important continuous probability distribution. The curve looks like a bell, so it is also called a bell curve.
Della has over 500 songs on her mobile phone, and she wants to estimate what proportion of the songs are by a female artist.
She takes an SRS of 50 songs on her phone and finds that 20 of the songs sampled are by a female artist.
The 99% confidence interval for the proportion of songs on her phone that are by a female artist will be
[tex]\rm x = 20\\\\n = 50 \\\\p = \dfrac{20}{50} = 0.4\\\\z= 99\% \ confidence\ interval = 2.58[/tex]
Then we know that
[tex]p\pm z \times \dfrac{p(1-p)}{n}\\\\0.4 \pm 2.58 \times \dfrac{0.4(1-0.4)}{50}\\\\0.4 \pm 2.58 \times \dfrac{0.4*0.6}{50}\\\\0.4 \pm 0.012384[/tex]
More about the normal distribution link is given below.
https://brainly.com/question/12421652
Hwhhehehebehehehejensnsnsnsnsne
Answer:
djdmfkdkdjdj
Step-by-step explanation:
jfjffmfkdnfjdjdndkd
[tex]5x-3x^{3}+1+6x^{2}[/tex]
Answer:
-32
Step-by-step explanation:
but I'm not that sure
Helpp me plzzzzzzz
Explain how the following two formulas are the same:
Volume = b x h
Volume = l x w x h
Answer:
they are the same because lxw is the b so all you need to do is bxh
Step-by-step explanation:
Please answer 9 and 11
Answer:
9. 3x+11+25=90 90-36=54 54/3=x x=18
11. 45+3x=180, 180-45=135, 3x=135, 135/3=45 x=45
A pair of dice is rolled. Find the probability of rolling a sum not less than 11
Answer:
dos dados con seis o un dado con 5 y otro con 6
Step-by-step explanation:
Answer:
1/12
Step-by-step explanation:
0_____________________________________0
The face says brainliest please!
what is the equation of the line?
Answer:
it is D ithought sinse for x=0 y=0 and for x=4 y=-2 (-1/2 x4 =-2 )and others didnot give correct nbs
A tree in Tom's backyard grows 0.6 meters each month. If the tree is 2.82 meters tall, for how many months has the tree been growing?
Answer:
4.7months
Step-by-step explanation:
2.82÷0.6 = 4.7
The owner of Lakewood Mall wants to know the number of people who shop at the mall more than once a week. He surveys 9696 customers and finds that 2424 of them shop at the mall more than once a week. What is the probability that the next person he surveys shops at the mall more than once a week?
Answer:
go make me a sandwhich you witch
Step-by-step explanation:
Blue Star is starting a new distribution service that delivers auto parts to the service departments of auto dealerships in the local area. Blue Star has found two light-duty trucks that would do the job well, so now it needs to pick one to perform this new service. The Ford TriVan costs $28,000 to buy and uses regular unleaded gasoline, with an average fuel efficiency of 24 miles per gallon. The TriVan has an operating cost of $.20 per mile. The Honda CityVan, a hybrid truck, costs $32,000 to buy and uses regular unleaded gasoline and battery power; it gets an average of 37 miles per gallon. The CityVan has an operating cost of $.22 per mile. The distance traveled annually is estimated to be 22,000 miles, with the life of either truck expected to be 8 years. The average gas price is $4.25 per gallon.
Required:
a. Based on life cycle cost, which model truck is the best choice?
b. How many miles does Blue Star need to put on a truck for the costs to be equal?
c. What is the crossover point in years?
Answer:
Blue Star
a. The Ford TriVan The Honda CityVan
Total life-cycle costs $94,368 $90,936
Based on life cycle cost, the Honda CityVan is the best choice.
b. Blue Star needs to put on the Ford TriVan 9,032 miles more for the cost to be equal with the Honda CityVan's.
c. The crossover point in years = 5 months
Step-by-step explanation:
a) Data and Calculations:
The Ford TriVan The Honda CityVan
Purchase costs $28,000 $32,000
Fuel efficiency per gallon 24 miles 37 miles
Operating cost per mile $0.20 $0.22
Total operating costs $4,400 $4,840
Estimated annual distance 22,000 miles 22,000 miles
Gallons of fuel consumed 916.7 (22,000/24) 594.6 (22,000/37)
Total cost of fuel $3,896 $2,527
Fuel cost per mile $0.18 $0.115
Total cost per mile $0.38 $0.335
Expected life of truck 8 years 8 years
Average gas price = $4.25 per gallon
Total costs:
The Ford TriVan The Honda CityVan
Annual costs:
Total operating costs $4,400 $4,840
Total cost of fuel $3,896 $2,527
Annual costs $8,296 $7,367
Life cycle costs:
Annual costs for 8 years $66,368 $58,936
Purchase costs $28,000 $32,000
Total life-cycle costs $94,368 $90,936
Difference in costs between Ford TriVan and Honda CityVan = $3,432 ($94,368 - $90,936)
Miles to put on the Ford TriVan for the life cycle cost to be equal to the life cycle cost of the Honda CityVan
= Difference in costs divided by total cost per mile of the Ford TriVan
= 9,032 miles ($3,432/$0.38)
Annual distance = 22,000 miles
Monthly distance = 1,833 miles
9,032/1,833 = 4.93 months or 5 months approximately
Skylar goes to a school which has 1000 students in it.She asks 40 random students whether they like the new 8.30 am start to the day. 30 of them say ‘no’ they do not like it. Use this information to estimate how many students in the whole school dislike the 8.30 am start
Answer:
Step-by-step explanation:
30 out of 40 could be used to estimate that 750 out of 1000 would say 'no'
30/40 equals 3/4
3/4 of 1000 is 750