Answer A
Answer B
Answer C
Answer D

D

Step-by-step explanation:

Polynomials are closed under addition and subtraction because we will still get a polynomial

Polynomials are closed under multiplication because we still get a polynomial.

Polynomials are not closed under division because we can get   negative exponents

2x/ 4x^2 = 1/2x  This is not a polynomial

D

Step-by-step explanation:

Quotient of 2 polynomials may not be a polynomial

Example:

(10x+5)/(5x²) = 2/x + 1/x²

= 2x^-1 + x^-2

which is not a polynomial because the power is negative

answer: slight chance that it will happen

step-by-step 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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step-by-step explanation: