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3 years ago

9

You are assigned 32 math exercises for homework. You complete 87.5% of these before dinner. How many do you have left to do afte

r dinner?

1 answer:

Hunter-Best [27]3 years ago

7 0

You would have 4 left after dinner: (.875)(32)=28 so you have 28 completed before dinner and would have 4 left to do.

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In a school gym the ratio of the number of boys to the number of girls were 4:3. After 160 days boys left the gym, the ratio bec

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3 years ago

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An average person in the United States throws away 4.5 × 10² grams of trash per day. In 2013, there were about 3.2×106 people in

enyata [817]

Answer:

Since there are 4.5*10^2 grams of trash per day per person, we multiply that by 3.2*10^6 for everyone in the US and then multiply that by 365 to get how much in a year, which is 525600000000 or 5.256*10^11 (I think it's 11)

Step-by-step explanation:

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2 years ago

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Determine whether the relation is a function. <br> {(-4, 1), (0, 0), (4, 0), (0, 4)}

olga nikolaevna [1]

Answer:

It isn't

Step-by-step explanation:

An x can't have to y's

way to remember: x=exes y=wives

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0 has two y's

6 0

2 years ago

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A college-entrance exam is designed so that scores are normally distributed with a mean of 500 and a standard deviation of 100.

Crank

Answer: 1.25

Step-by-step explanation:

Given: A college-entrance exam is designed so that scores are normally distributed with a mean $(\mu)$ = 500 and a standard deviation $(\sigma)$ = 100.

A z-score measures how many standard deviations a given measurement deviates from the mean.

Let Y be a random variable that denotes the scores in the exam.

Formula for z-score = $\dfrac{Y-\mu}{\sigma}$

Z-score = $\dfrac{625-500}{100}$

⇒ Z-score = $\dfrac{125}{100}$

⇒Z-score =1.25

Therefore , the required z-score = 1.25

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3 years ago

Volume & surface! May I please have help

Ludmilka [50]

Answer:

D

Step-by-step explanation:

surface area of cylinder

=(area of base)×2 + (area of curved surface)

$=(\frac{20}{2} )^{2} \pi$ × 2 + $20\pi$ × 25

=2 × $\pi$ × $10^{2}$ + 2 × $\pi$ × 10 × 25

3 0

2 years ago