please help.. all my points are gone and I need this asap
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Answer:

The dolphin will be above the surface of the water for 2 seconds.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

[tex]ax^{2} + bx + c, a\neq0[/tex].

This polynomial has roots [tex]x_{1}, x_{2}[/tex] such that [tex]ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})[/tex], given by the following formulas:

[tex]x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}[/tex]

[tex]x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}[/tex]

[tex]\Delta = b^{2} - 4ac[/tex]

The height of the dolphin after t seconds is given by:

[tex]h(t) = -16t^2 + 96t - 128[/tex]

According to Micha's model, how long will the dolphin be above the surface of the water?

It stays above the surface of the water between the first and the second root. Initially, it is below water, when the first time for which [tex]h(t) = 0[/tex] it crosses the surface upwards, and then the second time for which [tex]h(t) = 0[/tex] it crosses the surface downwards.

We have to find these roots. So

[tex]h(t) = -16t^2 + 96t - 128[/tex]

[tex]-16t^2 + 96t - 128 = 0[/tex]

Multiplying by -16

[tex]t^2 - 6t + 8 = 0[/tex]

[tex]\Delta = (-6)^{2} - 4*1*8 = 36 - 32 = 4[/tex]

[tex]t_{1} = \frac{-(-6) + \sqrt{4}}{2} = 4[/tex]

[tex]t_{2} = \frac{-(-6) - \sqrt{4}}{2} = 2[/tex]

4 - 2 = 2

The dolphin will be above the surface of the water for 2 seconds.

Answer:

=3(2(5)+1

=3×10+1

=30+1

=31

Answer:

(a) 33

(b) 27

(c) 1/2

Step-by-step explanation:

(a)

g(x) = 3(2x + 1)

g(5) = 3(2 * 5 + 1)

g(5) = 3(10 + 1)

g(5) = 3(11)

g(5) = 33

(b)

[tex] f(x) = \dfrac{12}{\sqrt{x}} [/tex]

[tex] f(9) = \dfrac{12}{\sqrt{9}} [/tex]

[tex] f(9) = \dfrac{12}{3} [/tex]

[tex] f(9) = 4 [/tex]

g(f(9)) = g(4) = 3(2(4) + 1)

g(f(9)) = 3(9)

g(f(9)) = 27

(c)

[tex] g(x) = 3(2x + 1) [/tex]

[tex] y = 3(2x + 1) [/tex]

[tex] x = 3(2y + 1) [/tex]

[tex] 2y + 1 = \dfrac{x}{3} [/tex]

[tex] 2y = \dfrac{x}{3} - 1 [/tex]

[tex] y = \dfrac{x}{6} - \dfrac{1}{2} [/tex]

[tex] g^{-1}(x) = \dfrac{x}{6} - \dfrac{1}{2} [/tex]

[tex] g^{-1}(6) = \dfrac{6}{6} - \dfrac{1}{2} [/tex]

[tex] g^{-1}(6) = 1 - \dfrac{1}{2} [/tex]

[tex] g^{-1}(6) = \dfrac{1}{2} [/tex]

fill the table

2x -y 2

6x 12^2 -6xy 12x

-y -2xy y^2 -2y

Answer:

[tex]12x + 24 = 2(6x + 12)[/tex]

[tex]12x + 24 = 3(4x + 8)[/tex]

[tex]12x + 24 = 4(3x + 6)[/tex]

[tex]12x + 24 = 6(2x + 4)[/tex]

[tex]12x + 24 = 12(x + 2)[/tex]

Step-by-step explanation:

Given

[tex]12x + 24[/tex]

Required

Equivalent expressions

No option were given; So, I will list out some possible equivalent expressions.

Using distributive property:

[tex]AB + AC = A*(B + C)[/tex]

So, we have:

[tex]12x + 24 = 2*6x + 2 * 12[/tex]

[tex]12x + 24 = 2(6x + 12)[/tex] ----- (1)

Another:

[tex]12x + 24 = 3*4x + 3 * 8[/tex]

[tex]12x + 24 = 3(4x + 8)[/tex]

Another:

[tex]12x + 24 = 4*3x + 4*6[/tex]

[tex]12x + 24 = 4(3x + 6)[/tex]

Another:

[tex]12x + 24 = 6*2x + 6*4[/tex]

[tex]12x + 24 = 6(2x + 4)[/tex]

Another:

[tex]12x + 24 = 12*x + 12*2[/tex]

[tex]12x + 24 = 12(x + 2)[/tex]

Answer: 2,16

Step-by-step explanation:

Answer:

Step-by-step explanation:

sin 60=CB/18

[tex]\frac{\sqrt{3} }{2} =\frac{CB}{18} \\CB=9\sqrt{3}[/tex]

Answer: 25%

Step-by-step explanation:

STEP ONE: Find the total possible ways to roll the dice.

- Each roll has 6 possible numbers

- Each roll is independent

6×6=36 possible combination

STEP TWO: Find the possible ways to roll the dice in odd-odd

- Each roll has 3 odd number (1, 3, 5)

- Each roll is independent

3×3=9 possible combination

STEP THREE: Put it into a fraction

Possibility of odd-odd=(possible odd-odd combination)/(total combination)×100%= 9/36 × 100%=0.25 × 100%= 25%

Hope this helps!! :)

Please let me know if you have any questions

Answer:

3x - 4 = 20

3x = 20 + 4

3x = 24

x = 24/3

x = 8

Answer:

[tex]3x - 4 = 20 \\3x = 20 + 4 \\ 3x = 24 \\ 3x \div 3 = x \\ 24 \ \div 3 = 8 \\ x = 8 [/tex]

Answer:

Confidence Interval =  ( 5.6 < μ < 8.2 )

The interval shows that the mean attractiveness is Above average on a scale of 1 to 10

Step-by-step explanation:

Data Given  : 5, 8, 2, 8, 7, 6, 6, 8, 9, 9, 6, 9

a) construct a confidence interval at a 95% confidence level

confidence interval = x ± tcritical ( s / √ n ) ------ ( 1 )

n = 12

μ (mean) = ( 5+8+2+8+7+6+6+8+9+9+6+9 ) / 12  ≈ 6.92

std ( s ) = √ 1/11 *∑( xi- X )^2

= √ 1/11 *  ( 5 - 6.92)^2 + ( 8 - 6.92)^2 + ( 2 - 6.92)^2 + ( 8 - 6.92)^2 + ( 7-6.92)^2 + ( 6 - 6.92)^2 + (6 - 6.92 )^2 + ( 8 - 6.92 )^2 + ( 9 - 6.92)^2 + ( 9 - 6.92)^2 + ( 6 - 6.92 )^2 + ( 9 - 6.92 )^2

= √ 1/11 * 46.92 =  2.07

tcritical at ∝ 0.05 , df = 11  = 2.20

Back to equation 1

6.92 ± 2.2 ( 2.07 / √ 12 )

( 6.92 ± 1.31 )

Confidence Interval =  ( 5.6 < μ < 8.2 )    

Answer:

y= 5/2x

Step-by-step explanation:

okay so the diffrence between 10, 12, 14 is 2 and diffrence between 25, 30 and 35 is 5

now... y=mx+b

slope or m= 5/2. y=5/2x

Answer:

$525.13

Step-by-step explanation:

cost per month = total expenses /  months in a year

total expenses = fixed cost + variable cost

$2,125.10 + $4,176.43 = $6,301.53

cost per month = $6,301.53/ 12 = $525.13

Answer:

B

Step-by-step explanation:

let's list everything out.

$35 for school supplies

$17.5 has already been used

$17.5 is left

pens only come in packs of 12

one pack of pens is $5

ok, so we know its definitely not C or D because they are less than 12

42 is not divisible by 12

since packs only come in 12's then it must be B.

good luck my friend!

Answer:

5

6

Step-by-step explanation:

To solve, collect like terms

x ≥ 2 + 21/2

x ≥ 4 1/2

the whole number that would be greater than 41/2 would be 5

2.  2.7 + 3.3  > x

6 > x

Answer:

1.Jose's

2.

Francis's

Step-by-step explanation:

Answer:

Step-by-step explanation:  

Answer:

49°

Step-by-step explanation:

since its a right angle that just subtract from 90

90-41= 49

Answer:

49

Step-by-step explanation:

Because of the square at O, we know that angle XOZ is a right angle and is 90°.

Since angle XOZ is made up of angle XOY and angle YOZ, we can subtract the measure of angle XOZ by the measure of angle XOY to find the measure of angle YOZ, which is equal to x.

x = 90 - 41

x = 49

Answer:

3, 5, and 6

Step-by-step explanation:

Answer: m = 7

Step-by-step explanation: This equation is written in slope-intercept form which is the same thing as y = mx + b form where m represents the slope of the line and b represents the y-intercept.

Now looking at this equation, we can see that m or the slope of the line is 7.

Answer:

hmmm

Step-by-step explanation:

not sure man

75m+500

You have the 500 as the initial amount and the 75m is how much juan adds each month

Answer:

99.9973 %

Step-by-step explanation:

This is a binomial probability distribution.

Since the probability of satisfactory welds = 97% = 0.97 and the probability of defective welds = 3% = 0.03.

Since there are 3 welds and we require at least one being defective, our binomial probability is

P(x ≥ 1) = 1 - P(x ≤ 0) = 1 - P(0) = 1 - ³C₀(0.03)³(0.97)⁰ = 1 - 1 × ‭0.000027‬ × 1 = 1 - 0.000027 = 0.99997‬3 × 100% = 99.9973%

Answer:

I like doods

Step-by-step explanation:

Pp + pp

Answer:

Answer: 10 inches

Explanation: You are given one side of the aquarium which is 18 inches. The top and the bottom of the aquarium is 18 inches because that’s what the diagram gives us. So you can multiply 18 x 2=36. Now, to find the missing side length, subtract the perimeter (56 inches) by 36 and you get 20 inches. However, that’s not your final answer because you have to divide 20/2=10 inches. 10 inches is the missing side length for the left and right side lengths

The missing length of the lid of her aquarium in the pricure is 18 inches.

The shape of the lid of her aquarium is a rectangle. A rectangle is a quadrilateral with four sides.

The perimeter of the rectangle = 2(length + width)

56 = 2(18 + l)

56/2 = 18 + l

28 = 18 + l

l = 28 - 18 = 10 inches

Find attached the required image. To learn more about the perimeter of a rectangle, please check: https://brainly.com/question/3205029

Answer:

Composite area is 400+157=557

or 400 + 50pi

Step-by-step explanation:

First find the area of the square

A=s*s A= 20*20

Area of the square portion is 400

then find the area of the semicircle- we know the diameter of the circle is 20, so the radius is 10.

[tex]A=\frac{1}{2} \pi r^{2}[/tex]

so

[tex]A=\frac{1}{2} \pi 10^{2} \\A=\frac{1}{2}\pi 100\\A=50\pi \\A= 157[/tex]

Composite area is 400+157=557

or 400 + 50pi