A circle x^(2) +2x+y^(2)-4y -4=0.If the line 2x-y+a=0 is its diameter. Then find the value of a.

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

The actual length of side t is 0.045cm. use the scale drawing to find the actual side length of w

Shelly bought a house five years ago for $150,000 and obtained an 80% loan. now the home is worth $140,000 and her loan balance has been reduced by $12,000. what is shelly's current equity?