A CD player marked for $45 was sold for $58.50 due to its great popularity to customers. By what percent did the price go
up?

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?

How can you tell when x and y are not directly proportional?

I’m stuck on this equation, anyone got the answer?