how to do this question plz. if you don't know the answer don't answer it if you know the answer answer it.

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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.

X+y=-4 x-y=2 use elimination with adding and subtraction