Prove that if v and w are both subspaces of the vector space u, then their intersection is also a subspace of u. write a formal proof and write legibly! show all steps. linear algebra.

Classify the polygon by its number of sides. state whether the polygon appears to be regular or not regular. a. heptagon, regular b. heptagon, not regular c. octagon, regular d. octagon, not regular

Answer this 30 points and brainliest!

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23