Subtract. (−d2 + 12d − 4) − (−7d2 − 2d + 12) =

The answer would be 26d - 16

I am using d^2 instead of d2 as that seems written incorrectly.

Same for -7d^2 instead of -7d2.

Start by changing the signs in the 2nd parenthesis by changing the subtract sign to a plus.

(-d^2 + 12d - 4) + (7d^2 + 2d - 12)

Now combine like terms

(7d^2 - d^2) + (12d + 2d) + -4 + -12

6d^2 + 14d + -16 (or 6d^2 + 14d - 16)

step-by-step explanation:

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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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step-by-step explanation: