Match each data relationship with a type of correlation

Which graph shows a function with a range of all real numbers greater than or equal to -1

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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?