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Sonja [21]
2 years ago
13

What is 31 - (15 + 25) = ? thanks if you help!

Mathematics
2 answers:
Kobotan [32]2 years ago
8 0

Answer:-9

Step-by-step explanation:

Dominik [7]2 years ago
7 0

Answer:

-9

Step-by-step explanation:

It is -9 because, using order of operations, you need to do the parentheses first. 25 + 15 is 40. Then, you do subtraction. 31-40=-9.

Hope this helps :)

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3 years ago
A study found that the average stopping distance of a school bus traveling 50 mph was 264 feet. a group of automotive engineers
lutik1710 [3]

Answer:

Step-by-step explanation:

Given that a  study found that the average stopping distance of a school bus traveling 50 mph was 264 feet.

Sample taken showed the following results

n=40\\\bar x =262.3 feet\\Std dev = \sigma= 3 ft

Since population std deviation is known and sample size is large, z test can be used.

H_0: \bar x=264\\H_a: \bar x

(Left tailed test)

Mean difference = 264-262.3 = 1.7

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Z = test statistic = mean diff/std error

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(Assumptions:

Sample are randomly drawn

Sample represents the population

4 0
3 years ago
Mr Ruiz drove 305 miles in 5 hours on Saturday and 190 miles in 4 hours on Sunday what is his average speed in miles per hour fo
Snezhnost [94]

Add the mileage together to find total miles.

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The average speed was 55 miles per hour.

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3 years ago
Read 2 more answers
HELP PLEASE ASAP!!!!!!!
noname [10]
The answer is A because if you combine like terms you'll get answer A.try to do it yourself. hope this helps
6 0
4 years ago
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