Which expression is a prime polynomial? OA. x3 - 27y^6
O B. 3x^2 + 18y
O c. x^4 + 20x^2 - 100
OD. 10x^4 – 5x^3 + 70x^2 + 3x

3030 ur welcome

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what grade level is this? need to know so i can look in my old textbooks!

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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