Areal estate broker's base is $21,000 and his commission rate is %5. how much real estate does the broker have to sell to earn $70,000?

b.-4 units

all you   do is count how many times you move

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0

answer:

c) the x-coordinate of the center of the circle increases by 3