Suppose integers a and b are even. Which expression MUST be even?
A) ab + 1
B) a + b + 1
C) 3(ab + 1)
D) 2(ab + 1)
E) a2 + b2 + 1

D

Step-by-step explanation:

2 multiplying by any number even or odd=even number

3/6   and 9/18

step-by-step explanation:

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb