Simplify the following surds:
a. √50=
b. √5+√8-√20+√2=
c. -6√20+2√45+7√5=

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Does the point (1, sqrt 7) lie on circle shown.

The radius of a sphere is 3 inches. which represents the volume of the sphere?