Lydia bought a shirt at 20% off its retail price of $40. she paid 5% tax on the price after the discount. how much did lydia pay for the shirt?

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