3 years ago

What positive or negative integer represents you descending 15 feet into a cave?

Mathematics

1 answer:

OLga [1]3 years ago

7 0

Answer:

-15

Plzzzz give me Brainliest!

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The number of pages in the books in a library follow a normal distribution. The mean number of pages in a book is 150 with a sta

AysviL [449]

As the mean is E[X] =150 and $\sigma$ = 30, using the normal distribution to get the answer is just using Z. So, what we need is P(X<180).

$Z= \frac{x-E[X]}{\sigma } = \frac{180-150}{30} = \frac{30}{30} = 1$

P(x<180) = P(z< 1) = $\phi$ (1) = 0.8413.

Then, just multiplying the amount of books you have, which is 500, with the probability would give how many books are less than 180 pages, being:
$0.8413 * 500 = 420.65$

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3 years ago

What is an equation of the line that passes through the points (4, -2) and (8,3)?

Dimas [21]

Use the equation to find the slope: m=y2-y1/x2-x1 and plug in each of the y coordinates into the numerator and each of the x coordinates in the denominator

m=-2-3/4-8
-5/-4
m=5/4

Plug in the slope and one of the ordered pairs into y=mx+b. I’ll use (8,3)

3=5/4(8)+b
3=10+b
-7=b

Equation: y=5/4x-7

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2 years ago

Your school district cancels school when more than 2.5 inches of snow accumulate on the ground each hour. Snow is currently accu

riadik2000 [5.3K]

Answer:

It’s a or b

Step-by-step explanation:

8 0

2 years ago

Guys hi am i correct ??

Sloan [31]

Yes, you are correct.

Hope my answer helped u :)

4 0

2 years ago

Solve the equation by factoring. z2 − 6z − 27 = 0

Kisachek [45]

The answer is x= 9 and -3

You must fine 2 number that multiply to equal -27 and add to equal -6

(x-9) (x+3)
Then equal the parts of the binomial to zero

x - 9 = 0
x + 3 = 0

You must get x by its self.
When you do so, you'll have the answer as -3 and 9

7 0

3 years ago