15x + 6 - 7x - 8 can someone help me with this

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

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

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