The perimeter of a rectangle is 42cm. What is its lenght and width, if the width is 3cm more than half the length? Step-by-step please

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2