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bija089 [108]
3 years ago
5

It takes the teacher 39 minutes to grade 3 book reports. At this rate, how long will it take the teacher to grade 120 book repor

ts?
Mathematics
2 answers:
zzz [600]3 years ago
7 0

it will take 1560 minutes

zheka24 [161]3 years ago
4 0

Answer:

26 hours

Step-by-step explanation:

first you need to divide 39 by 3 to get 13 now once you get 13 you will multiply it by 120 once you are done you get 1560 now the number that we got is how long a teacher would have to grade in minutes now if you want we can convert it into hours which would give us 26 hours.

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(02.06)If 1 pint is equal to 2 cups, then 5 pints would equal ___ cups.
EleoNora [17]

Answer:

If 1 pint is equal to 2 cups, then 5 pints would equal _<u>5</u>_ cups.

Step-by-step explanation:

Let's use a ratio to solve:

pints : cups

  1      :   2

  2     :   4

  3     :   6

  4     :   8

  5     :   10

There would be 10 cups in 5 pints.

3 0
3 years ago
Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is 13.4 years with a s
Aliun [14]

Answer : 0.0129

Step-by-step explanation:

Given : Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is \mu=13.4 years and standard deviation is \sigma=1.7 years.

Sample size : n=40

Let X be the random variable that represents the age of fleets.

We assume that the ages of the fleets of the 10 largest U.S. commercial passenger carriers are normally distributed.

For z-score,

z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}

For x=14

z=\dfrac{14-13.4}{\dfrac{1.7}{\sqrt{40}}}\approx2.23

By using the standard normal distribution table , the probability that the average age of these 40 airplanes is at least 14 years old will be :-

P(x\geq 14)=P(z\geq2.23)\\\\=1-P(z

Hence, the required probability = 0.0129

6 0
3 years ago
1+14554345555556675566669877
zhenek [66]
<span>14554345555556675566669878 is your answer.

All you have to do when adding 1 is add the number at the very end of the number +1. 

It's quite easy.

Glad I could help, and good luck!


</span>
8 0
3 years ago
Read 2 more answers
2x + y = 7 y = x + 1 When the expression x+1 is substituted in for y in the first equation, the result is
Charra [1.4K]

2x + y = 7

substitute

2x + (x+1) =7

combine like terms

3x+1 =7

subtract 1 from each side

3x =6

divide by 3

x=2

y = x+1

y =2+1

y=3

Answer: x=2, y=3

6 0
3 years ago
In the worst storm in Sunnyville history, 6 inches of rain fell in 8 hours. What was the amount of rainfall per hour?
Delvig [45]

Answer:

0.75 cm of rain per hour

Step-by-step explanation:

I know if the cm part made sense but okay

7 0
3 years ago
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