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2 years ago

7

In a class of 42 students, about 71% of them went trick or treating. About how many students in the class went trick or treating

?

2 answers:

Amanda [17]2 years ago

6 0

About 29 students went trick or treating

zubka84 [21]2 years ago

6 0

Answer:

About 29

Step-by-step explanation:

71% of 42 is 29.82.

You can't have .82 of a student, so it is 29!

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Amelia launched her science fair rocket, and then backed away. The path of the rocket is given by the equation below, where y is

Mamont248 [21]

Answer:

1)The rocket hit the ground at $x = \frac{5}{4}$

2)The maximum height of the rocket = 12.468 feet

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given equation

y = -2 x² + 5 x + 7 ...(i)

Differentiating equation (i) with respective to 'x' , we get

$\frac{dy}{dx} = -2( 2x) +5(1) = -4x +5$

Equating zero

$\frac{dy}{dx} = 0$

⇒ -4 x +5 =0

⇒ -4 x = -5

⇒ $x = \frac{5}{4}$

<em> The rocket hit the ground at </em> $x = \frac{5}{4}$ <em></em>

<u><em>Step(ii):</em></u>-

$\frac{dy}{dx} = -4x +5$ ...(ii)

Again differentiating equation (ii) with respective to 'x' , we get

$\frac{d^{2} y}{dx^{2} } = - 4(1)$

The maximum height at x = $\frac{-5}{4}$

y = -2 x² + 5 x + 7

$y = -2 (\frac{5}{4})^{2} + 5 (\frac{5}{4} ) + 7$

$y = \frac{-2(25)+ 25 (16)+7(64)}{64}$

$y = \frac{798}{64} = 12.468 feet$

<em>The maximum height of the rocket = 12.468 feet</em>

4 0

2 years ago

Need help with this data table need it to end up to 1024 thanks

Iteru [2.4K]

1 2 4 8 16 32 64 128 256 512 1024. each one is 2 times the previous

3 0

2 years ago

5(1 + 4m) – 2m = -13

Oksana_A [137]

Answer and Step-by-step explanation:

Solve for m.

<u>First, distribute the 5.</u>

5 + 20m - 2m = -13

<u>Combine like terms.</u>

5 + 18m = -13

<u>Subtract 5 from both sides of the equation.</u>

18m = -18

<u>Divide by 18 to both sides of the equation.</u>

<u>m = -1 <- This is the answer.</u>

<u></u>

<em><u>#teamtrees #PAW (Plant And Water)</u></em>

3 0

2 years ago

Read 2 more answers

Write the equation of the line the passes through (1, -2) and (3, 4) in slope intercept form.

Alona [7]

Answer:

y=3x-5

Step-by-step explanation:

First find the slope, 4+2 over 3-1, giving you the slope of three

then set up your equation, y=3x+?

I played with the y=3x - part on the website desmos graphing calculator, I first inserted the points then found the slope and then played with the equation till it went through both the points.

4 0

2 years ago

S = -t³ + 2t² - 2t, 0 ≤ t ≤ 2 Find the body's speed and acceleration at the end of the time interval. *

RSB [31]

Answer:

A

Step-by-step explanation:

the end of interval is t=2

v=s'= -3t^2+4t-2

v(2)= -3(2^2)+4(2) -2

v(2)=-12+8-2

v(2)= -6m/s

so tje ans is A

5 0

2 years ago