Shelly biked 21 miles in 4 hours. what is shellys average speed in miles per hour? at the same rate how many hours will it take shelly to bike 42 miles?

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

For the equations below which statement is true ?

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