How do you solve ninety two divided by 2 equals

What is the equation of the graph below? y=sec(x)-4

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?

Which of the following expressions is equal to 2x^2+8