What is the solution to this problem? 9 to the fourth power • 9 to the negative 3 power

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What term makes it inconsistent y=2x - 4 ?