Could someone help and tell me how you got the answer? Will mark brainlist!

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?

What is the value of x? enter your answer in the box. x = two intersecting tangents that form an angle of x degrees and an angle of 134 degrees.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)