How many pounds of chocolate worth $4.40 a pound must be mixed with 5 pounds of chocolate worth 80 cents a pound to produce a mixture worth $4.00 a pound?

you will need 40 pounds of chocolate worth $4.40

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