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3 years ago

9

The numbers of pages in the books in a library follow a normal distribution. If the mean number of pages is 180 and the standard

deviation is 30 pages, what can you conclude?

1 answer:

Katena32 [7]3 years ago

8 0

16% have fewer pages
84% have more pages

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The graph of an exponential function passes through (1, 10) and (4, 80). Find the function that describes the graph.

svetlana [45]

Answer:

y = 5*2ˣ

Step-by-step explanation:

<u>Exponential function:</u>

y = abˣ

<u>Ordered pairs given:</u>

(1, 10) and (4, 80)

<u>Substitute x and y values to get below system:</u>

10 = ab
80 = ab⁴

<u>Divide the second equation by the first one and solve for b:</u>

80/10 = b³
b³ = 8
b = ∛8
b = 2

<u>Use the first equation and find the value of a:</u>

10 = a*2
a = 5

<u>The function is:</u>

y = 5*2ˣ

4 0

2 years ago

Read 2 more answers

What is r in this equation? <br>πr^2=42π

kupik [55]

R in this equation refers to the radius

${\pi r}^{2} = 42\pi \\ {r}^{2} = \frac{42\pi}{\pi} \\ r = \sqrt{42 } \\ r = 6.480740698$

4 0

2 years ago

Please help with Algebra

mina [271]

Answer:

C) 6

Step-by-step explanation:

I converted the equation into slope-intercept form and then identified the y-intercept.

$4x+2y=12\\\\4x-4x+2y=12-4x\\\\2y=12-4x\\\\\frac{2y=12-4x}{2}\\\\ y=6-2x\\\\y=-2x+6\\\\y=-2x+\boxed{6}$

C should be the correct answer.

Hope this helps.

3 0

2 years ago

Read 2 more answers

Help me by tonight please ! Thank you

IrinaVladis [17]

C
B
B
A
C

I think it’s this

7 0

2 years ago

Over the course of a multi-stage 4510-km bicycle race, the front wheel of an athlete's bicycle makes 1.70x106 revolutions. How m

iragen [17]

Answer:

The wheel have made $2.10 * 10^{6} m$ revolutions.

Step-by-step explanation:

The total distance traveled during the race is

D = 4510km [(1000m)/(1km)] = $4510 * 10^{3} m$

The radius (r1) of the smaller bicycle wheel is

r1 = $\frac{D}{2*pi*N1} = \frac{4510 * 10^{3} m }{2*pi*(2.18*10^{6}) } =0.329 m$

Than the larger wheel has a radius

r2 = 0.329 m + 0.012 m = 0.341 m

Over the same distance this wheel would make N2 revolutions

N2 = $\frac{D}{2*pi*r2} = \frac{4510 * 10^{3} m }{2*pi*(0.341) } = 2.10 * 10^{6} m$

8 0

3 years ago