1. An expression is given.
(2x + 8) (5x-7)

Which expression is equivalent to the given expression? Show your work.

a. 36x – 56
b. 10x² – 56
c. 10x2 + 26x - 56
d. 10x² + 54x + 56

Show your work (you must show your work for full credit):

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step-by-2step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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