Rico ran a race that was 3 km long. how many meters did rico run?

We just started the introduction into circles and i have no idea how to do this.

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?