If a rectangle has a one side length of 20 and another of 15, what is the length of the diagonal going to be?

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

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