2. Find the value of the expression 21 – 2a if a = 3. O A. 15
O B. 57
O C. 27
O D. 16

a. 15

Explanation:

Step 1 - Input the value of 'a' in the expression.

21 - 2a

21 - 2(3)

Step 2 - Multiply two and three

21 - 2(3)

21 - 6

Step 3 - Subtract six from twenty one

21 - 6

15

Therefore, the value of the expression 21 - 2a if a = 3 is a. 15.

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

the function makes a strait line horizontally with no x intercept but a y intercept at 9.