Which expression is equivalent to cos 150?

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

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

Write the expression as a single natural logarithm. 2 in a - 4 in y