Tyler and sophia went on a 20-kilometer bike ride that lasted 3 hours. their walking speed was 4-kilometers per hour. their riding speed was 12-kilometers per hour. how much time did they spend walking?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

Solve the triangle. a = 21°, c = 105°, c = 5