X^2+y^2-4y-15=6
rewrite the equation of a circle in standard form. state the radius r of the circle.

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

How to simply and write the answer n a whole number