During summer vacation, you charge people $8 per hour for swimming lessons and a $20 registration fee. if you make $52 one day, how many hours did you spend teaching lessons?

2x+3y=12 x-y=6 solve the following system equations

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?