Which of the sets of ordered pairs represents a function? A=(1,5) (8,-5) (8,7) (2,9) B= (7,-4) (7,-2) (6,-3) (-9,5)

A. only
B. Only B
C. Both A and B
D. Neither A nor B

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.

This circle is centered at the origin, and the length of its radius is 6. what is the circle's equation? a. x^2+y^2=36 b x^2+y^2=6 c x+y=36 d x^6+y^6=1