Which of the following is a composite number? 61 , 13 , 63 , 31

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

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?

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?