Which of these expressions is equivalent to -2(x-5)?

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?

How do you find the circumfrance of a circle?

You deposit $5000 each year into an account earning 3% interest compounded annually. how much will you have in the account in 30 years?