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3 years ago

10

A class survey showed 8 out of 25 students had plans to travel over spring break.how many student out of the 400 students in the

entire school would you expect to be traveling over spring break?

2 answers:

Airida [17]3 years ago

4 0

Divide 400 by 25. You get 16. Multiply 16 by 8. You get 128.

Nataly [62]3 years ago

3 0

Use ratio and proportion:
$\frac{8}{25}=\frac{x}{400}$

$3200=25x$

$\frac{3200}{25}=\frac{25x}{25}$

$128=x$

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14(0.89)^x+4.5 =162

lisabon 2012 [21]

$14(0.89)^{x + 4.5} = 162$
$\frac{14(0.89)^{x + 4.5}}{14} = \frac{162}{14}$
$0.89^{x + 4.5} = 11\frac{4}{7}$
$ln(0.89^{x + 4.5}) = ln(11\frac{4}{7})$
$(x + 4.5)ln(0.89) = ln(11\frac{4}{7})$
$\frac{(x + 4.5)ln(0.89)}{ln(0.89)} = \frac{ln(11\frac{4}{7})}{ln(0.89)}$
$x + 4.5 = -2101.14032500$
$x = 2105.64032500$

3 0

3 years ago

I need to know the answer

grandymaker [24]

Answer: $f(x)=-(x-5)^{2}(x+2)$

Step-by-step explanation:

There is a double root at x=5 and a single root at x=-2, so we know f(x) is of the form $f(x)=a(x-5)^{2}(x+2)$ for some constant a.

To find a, we can substitute the coordinates of the y-intercept, (0, -50).

$-50=a(0-5)^{2}(0+2)\\\\-50=50a\\\\a=-1$

So, $f(x)=-(x-5)^{2}(x+2)$

3 0

1 year ago

Can you please help me fill this out thanks

RoseWind [281]

For perimeter you just add the sides up, so 15+12+9 which = 36

7 0

3 years ago

Read 2 more answers

Matlab a farmer wishes to build a rectangular pen for his animals out of 40 feet of fencing what should be the length and width

ASHA 777 [7]

Width=w
length=(40-2w)/2=20-w
A=w(40-w)
A=40w-w²
A'=40-2w=0
2w=40
w=20

20x20 is the size of the pen having the greatest area. this tells us the largest rectangle for a given perimeter is a square

8 0

2 years ago

What value of x makes the equation −2x−(−5−4x)=−5(2x−7) true?

Anestetic [448]

Answer:

-2x - (-5 - 4x) = -5(2x - 7)

-2x + 5 - 4x = -5 * 2x - 5 * (-7)

-6x + 5 = -10x - 35

-6x + 5 + 10x = -10x - 35 + 10x

4x + 5 = -35

4x + 5 - 5 = -35 - 5

4x = -40

4x/4 = -40/4

x = 10

Step-by-step explanation:

3 0

2 years ago