Kelli and Ana were working diligently on a math problem. After they substituted in their answer, they got the following as a solution: x = 3 and y = 9

How many solutions does this answer indicate that the system of equations has?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?