Jill bought a lamp for $40. She sold it at a garage sale for $12. What was the approximate decrease?

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?

Agraphic designer created a logo on eight and a half by 11 inch paper. in order to be placed on a business card, the logo needs to be one and 7/10 inches by 2 and 1/5 in. what is the scale factor of the dilation

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).