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Alex787 [66]
3 years ago
5

Help me with these three quesions for brainiest:)

Mathematics
2 answers:
mafiozo [28]3 years ago
6 0

Answer:

See below.

Step-by-step explanation:

1) Two equations are equivalent if they have the same solutions.

2) As long as two expressions a and b are equal, so a=b, adding the same value for both sides still makes the equation true, so

a = b

a + c = b + c is true.

3) As long as two expressions a and b are equal, so a=b, subtracting the same value for both sides still makes the equation true, so

a = b

a - c = b - c is true.

Gemiola [76]3 years ago
5 0

Answer: f

Step-by-step explanation:

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It took Brian 6 hours to drive to the sales conference. He took the same route on the way back home, but
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Answer:

A) 34.13%

B)  15.87%

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To find the percent of scores that are between 90 and 100, we need to standardize 90 and 100 using the following equation:

z=\frac{x-m}{s}

Where m is the mean and s is the standard deviation. Then, 90 and 100 are equal to:

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So, the percent of scores that are between 90 and 100 can be calculated using the normal standard table as:

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At the same way, we can calculated the percentages of B, C, D, E and F as:

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P( 80

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F) More than 130

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