The length of a rectangle is increasing at a rate of 7 cm/s 7cm/s and its width is increasing at a rate of 5 cm/s 5cm/s. When the length is 40 cm 40cm and the width is 10 cm , 10cm, how fast is the area of the rectangle increasing

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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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sure i'm up for it

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the answer is a.

135 and 80

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