The radius of a circle is 8 what is the area of the circle? pls show work

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.

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)