Please help me. i’ve been stuck on this test for 3 days and i need to get at least a 70% to pass

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

The rectangle shown has a perimeter of 108 cm and the given area. its length is 6 more than five times its width. write and solve a system of equations to find the dimensions of the rectangle.

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.