Factor the expression: 7a + 63b + 14

7(a + 9b + 2)

Step-by-step explanation:

7 can be put in to all of the numbers. 7 into 7 is 1, 63 into 7 is 9, and 14 into 7 is 2. That means that you can take 7 out. Your equation will be 7(a + 9b + 2)

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:

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94