Whis is the graph of = 2cos pi x

On a piece of paper graph f(x)=5•(0.4)^x

In a probability experiment, karen flipped a coin 76 times. the coin landed on heads 32 times. what percentage of the coin flips resulted in tails? round to the nearest percent. a. 58% b. 65% c. 42% d. 60%

Which expression gives you the distance between the points (5,1)and(9,-6)