Darcy earned $5. samantha earned $30. samantha times as much as darcy

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories. if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

How did different parts of the united states feel about slavery