How many solutions foes the system have y=-2x+4 7y=-14x+28

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

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b