PLEASE HELP ASAP Is the function ƒ(x) = (9/10)^x an exponential function? If so, identify the base. If not, why not?

Apool measures 100 meters by 100 meters a toddler inside the pool and trows a ball 60 centimeters from one edge of the pool.how far is the ball from the opposite edge of the pool

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom