Answer:
Answer is option C.
Step-by-step explanation:
This is because it does not take into account "random selection" (probability). Thus the mode of selection is biased. The mere fact that a teacher selects his favourite student means the experiment is biased.
Solve for c.
3 − 7c − 20c = 7(–7c − 19) + 14c
c =
Answer:
[tex] \boxed{c = -17} [/tex]
Step-by-step explanation:
[tex] = > 3 - 7c - 20c = 7( - 7c - 19) + 14c \\ \\ = > 3 - 27c = ( - 7c \times 7) - (7 \times 19) + 14c \\ \\ = > 3 - 27c = - 49c - 133 + 14c \\ \\ = > 3 - 27c = - 35c - 133 \\ \\ = > 3 - 27c + 35c = - 133 \\ \\ = > 3 + 8c = - 133 \\ \\ = > 8c = - 133 - 3 \\ \\ = > 8c = - 136 \\ \\ = > c = - \frac{136}{8} \\ \\ = > c = - 17[/tex]
Answer:
c = -17
Step-by-step explanation:
→Distribute the 7 to (-7c - 19):
3 - 7c - 20c = -49c - 133 + 14c
→Add like terms (-7c and -20c, -49c and 14c):
3 - 27c = -35c - 133
→Add 35c to both sides:
3 + 8c = -133
→Subtract 3 from both sides:
8c = -136
→Divide both sides by 8:
c = -17
Marie wants to know the most popular car for parents. She plans to survey the people shopping at the used car lot from 10 AM to 11 PM. Which statement below best reflects Marie’s plan?
A) Marie’s sample is valid
B) Marie should also survey people entering the grocery stores.
C) Marie’s sample is biased
D) Marie should make sure she surveys both men and women.
Answer:
This is biased.
Step-by-step explanation:
A used car lot tends to have cheaper cars, so people who can't afford brand new cars come here to buy used cars.
pls help brodddddda for da brainliest
Answer:
a) 21, 24, 29
b) 5 terms in the sequence are less than 50
Step-by-step explanation:
[tex]t_n = n^2+20\\t_1 = 1^2+20 = 1+20= 21\\t_2 = 2^2+20 = 4+20= 24\\t_3 = 3^2+20 = 9+20= 29\\\\\\t_5 = 5^2+20 = 25+20= 45\\\\\\t_6 = 6^2+20 = 36+20= 56\\[/tex]
Since, 5th term is less than 50 and 6th term exceeds 50, therefore 5 terms in the sequence are less than 50.
What is the measurement of angle A to the nearest degree?
At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were at the party?
Answer:
There were 12 people at the party
Answer:
Step-by-step explanation:
Other answers have already shown that there are n=12 people at the party, either using combinatorial choose notation
(n2)=n!2!(n−2)!=66
or by counting handshakes person by person, noting that each successive person has one fewer unique handshake than the prior (as the previously counted people are disregarded), and then using the sum-of-consecutive-integers formula to get
(n−1)+(n−2)+...+2+1=∑n−1k=1k=(n−1)n2=66
and solving for n .
Here I will provide another method of arriving at n(n−1)2=66.
Instead of keeping track of unique handshakes from the start, note that each person shakes hands with n−1 other people. As there are n people at the party, this gives us n(n−1) handshakes. However, notice that we counted each handshake twice; for example, if Alice and Bob shook hands, we counted that once for Alice, and then again for Bob. To account for the double-counting, we can divide by 2, which gives us the previously mentioned formula of n(n−1)2.
As a side note, if we did not previously know the sum formula, we could use this as a combinatorial proof to show that it works. Also, if we account for repeated counting by dividing by k! , the number of permutations of k objects, a similar method can be used to derive the chosen formula (nk)=n!k!(n−k)!.
Helppppppp Asappppppp
Answer:
All of them
Step-by-step explanation:
2/2 is 1, and if the shaded part is 2/2, everything would be shaded.
Answer:
A, B, C, D
Step-by-step explanation:
2/2 is equivilant to 1. This means that to be equvilant to 2/2 the entire diagram would have to be shaded in.
Hope this helps! (Please consider giving brainliest)
Heather is flying a kite at the park. The string makes an angle of 53° with the level ground. The kite is 28 meters above the ground. How long is the string from heather.To the kite?
Answer:
35.06 meters
Step-by-step explanation:
This represents a right angled triangle.
The height of the kite above the ground represents the opposite side while the length of the string of the heather of the kite is the hypotenuse.
We need to find the hypotenuse, h.
We can use the sine part of the trigonometric function SOHCAHTOA:
sin(Ф) = opp / hyp
where opp is the side opposite the angle
hyp is the hypotenuse
=> sin(53) = 28 / h
h = 28 / sin(53)
h = 35.06 meters
The length of the string from the heather to the kite is 35.06 meters
find the value of x
m<2 = 9x - 1
Answer: x=9
Step-by-step explanation:
The bottom triangle that has a 40° is an isosceles triangle, therefore the other angle at the bottom right is also 40°. This leaves the top angle to be 100°.
180=40+40+x
180=80+x
x=100
Now, to find ∠2, you can tell it is a supplementary angle. Therefore, the 2 angles add up to 180°
180-100=∠2
80°=∠2
The problem states that ∠2 is 9x-1. We know that ∠2 is 80°. We can solve for x.
80=9x-1
81=9x
x=9
when graphed which equation will yield the same maximum value as the graph of y = -3x^2 + 6x + 9 ?
a) y = -3(x - 1)^2+12
b) y = -3(x + 1) ^2 - 12
c) y = 3(x - 1)^2 -12
d) y = 3(x + 1)^2 + 12
Answer:
A
Step-by-step explanation:
Graphed below are all 5 graphs. The one in red is the original, but it cannot be seen because it is entirely concealed by the blue graph, or graph A. Since they are the same graph, they must share all characteristics, including a maximum value. Therefore, the correct answer is choice A. Hope this helps!
Answer:
-3(x - 1)^2+12
Step-by-step explanation:
Have a good day :)
Can someone please answer the question in the picture?
Answer:
c = 68
Step-by-step explanation:
Use pythagorean theorem, which states that [tex]a^{2} +b^{2} =c^{2}[/tex].
In this diagram, we are given the values of a and b.
a = 32 b = 60
Simply put these into the equation.
(32)^2 + (60)^2 = c^2
1024 + 3600 = c^2
4624 = c^2
Find the square root of both sides to solve for c.
[tex]\sqrt{4624}[/tex] = c
c = 68
examples of spiral motion
Answer:Examples of Spiral Movement are:
Step-by-step explanation:
1)Cyclone
2)Spiral fern
The examples of a spiral motion include cyclone, motion of electron in uniform magnetic field.
What is spiral motion?The path of a point in a plane moving around a central point while continuously receding from or approaching it.
Given is a spiral motion.
The examples of a spiral motion include cyclone, motion of electron in uniform magnetic field.
Therefore, the examples of a spiral motion include cyclone, motion of electron in uniform magnetic field.
To solve more questions on spiral motion, visit the link below -
https://brainly.com/question/11020427
#SPJ2
plz help will give brainiest cuz like u r duh lol!
Answer:
C
Step-by-step explanation:
-4d is greater or equal to -12
d is less than or equal to 3
Answer:
c
Step-by-step explanation:
c is the answer
the area of square abcd is 7cm^2
show that x^2+4x=3
Answer:
see explanation
Step-by-step explanation:
The area (A) of the square = s² ( s is the measure of the side )
Here s = x + 2 and A = 7 , thus
(x + 2)² = 7 ← expand left side using FOIL
x² + 4x + 4 = 7 ( subtract 4 from both sides )
x² + 4x = 3 ← as required
Answer:
(x + 2)² = 7
x² + 4x + 4 = 7
x² + 4x = 3
Step-by-step explanation:
I NEED HELP PLS PLS PLS
MEAN OR MEDIAN
IQR OR MAD
Answer:
mean and range
Step-by-step explanation:
The endpoints of a segment are (4,2) and (7,4). What are the endpoints of the segment after it has been translated 3 units to the right? A. (1,2), (4,4) B. (4,2), (10,4) C. (4,5), (7,7) D. (7,2), (10,4)
Answer:
The endpoints of the segment are (7,2) and (10,4).
Step-by-step explanation:
Since it is being translated to the right, you add 3 to both x values.
Answer:
DDDD
Step-by-step explanation:
got it right on edge <3
complete the table of values for y=2x+3
[tex]\left \{ {{x=-2 -1 0 1 2 3} \atop {y= 1 7}} \right.[/tex]
[tex]y = - 2047 \\ x = - 10125[/tex]
Step-by-step explanation:
[tex]y = 2x + 3 \\ x = - 2 - 10123 \\ x = - 10125 \\ y = 2( - 10125) + 3 \\ y = - 20520 + 3 \\ y = - 20247[/tex]
choose the correct congruence statement for the figure shown
Answer:
see below
Step-by-step explanation:
In order by increasing number of angle marks, the vertices of the lower triangle are ...
I H G
In the same order, the vertices of the upper triangle are ...
H I E
Using these as the names of the triangles, we can write the congruence statement ...
ΔIHG ≅ ΔHIE . . . . . matches the 2nd choice
20 POINTS- EASY
8. Luisa invests $1900 for 4 years and earns $152 in simple interest. What is
the interest rate as a percent?
A. 2%
B. 4%
C.6%
D. 102%
Answer:
2%
Step-by-step explanation:
1900(x)^4= 1900+152
1.019 and is closer to 2%
The Hernandez family built a backyard patio. The width and length of the patio are whole numbers. What could be the dimensions of the patio if the area is 50 square feet? Pls help me due in 10 min!! Thanks
Answer:
10ftx15ft could be possibility.
Step-by-step explanation:
SOMEONE PLEASE HELP ME!
Answer:
-7 and 3
-5 and 1
-3 and -1
They all give the same total i.e. -4
Answer:
-7 and 3
-5 and 1
-3 and -1
Step-by-step explanation:
The total is -4
What is the value of 7C2?
7!/2!
Step-by-step explanation:
nCr=(nr)=n!r!(n−r)! 7C2=(72)=7!2!(7−2)!=7!2!⋅5!=50402⋅120=5040240=21.
Choose the answer that expresses the area of this square as a trinomial ( 2y+ 3) and ( 2y+3)
Answer:
4y^2 + 12y + 9
Step-by-step explanation:
Unclear what your (2y + 3) represent. If it's the length of one side of the square, please say so.
If that's the case, then the area of the square is (2y + 3)^2, or 4y^2 + 12y + 9, which is a trinomial.
Please answer CORRECTLY !!!!! Will mark brainliest !!!!!!!!!!
Answer:
5x² + 10
Step-by-step explanation:
5(x² + 2)
= 5x² + 10
PLEASE HELP!
Which shape contains exactly three congruent sides?
A. Scalene triangle
B. Equilateral triangle
C. Isosceles triangle
D. Right triangle
Answer:
B. Equilateral triangle
Step-by-step explanation:
The shape that contains exactly three congruent sides is an equilateral triangle.
PLS HELP!!!!
EMERGENCY!
What is the exponential regression equation for the data set?
X: 1, 3, 5, 7, 9, 11, 13
Y: 12, 21, 29, 36, 44, 58, 67
(A) yˆ=12.85⋅1.15x
(B) yˆ=12.85⋅0.15x
(C) yˆ=1.15⋅12.85x
(D) yˆ=(1.15⋅12.85)x
Answer:
B, i'm not quite sure though i hope this helped
Step-by-step explanation:
Answer:
its A
Step-by-step explanation:
I just took the test
A bag has 10 pens in it: 4 black, 3 blue, 2 green and 1 red
You randomly choose one pen from the bag and give it to Maria (who keeps it). You then randomly choose another
pen from the bag and give it to Ahmed. What is the probability that Maria gets a black pen and Ahmed gets a red
pen?
45
O
0 1 / 2
cation
Ri
E
w
9
Chip
Can someone help me on this
Answer:
The new area is 20.75 square
Step-by-step explanation:
Work out the length of BC .
Answer:
10
Step-by-step explanation:
Use the Pythagorean theorem: a^2+b^2=c^2 to find the hypotenuse
a=6
b=8
6^2+8^2=c^2
36+64=c^2
100=c^2
10=c
Hope this helps! :)
Answer:
10 cm.
Step-by-step explanation:
By Pythagoras:
BC^2 = 6^2 + 8^2
BC^2 = 100
BC = 10.
What is the simplified expression for the expression below? Negative one-fifth (5 x + 20) minus one-fourth (4 x minus 28) –2x + 3 –2x – 3 –2x – 8 –2x + 8
Answer:
Hello, the answer to this question is A the other person is wrong
Step-by-step explanation:
Answer:
A) –2x + 3
Step-by-step explanation:
What is the inverse of f(x) =1/3x +3
Answer:
h(x) = 3x - 6
Step-by-step explanation:
To find the inverse of a function, you have to switch the x- and y-values.
y = 1/3x + 2
x = 1/3y + 2
(x) - 2 = (1/3y + 2) - 2
x - 2 = 1/3y
(x - 2)(3) = (1/3y)(3)
3x - 6 = y
y = 3x - 6