Math 110 Homework Assignment 8 due date: 11, 2016 1. Determine if the linear transformations described by the following matrices are invertible. If...

Please help with the question 4

4. For each of the following subsetsWofR3, either show that they are subspaces, orshow why they aren’t subspaces by explaining which of the three conditions don’t hold.(a)W={(x, y, z)∈R3|x2+y2=z2}.(b)W={(x, y, z)∈R3|(x, y, z) is orthogonal to (3,1,−2)}.(c)W={(x, y, z)∈R3|x+y+z>0}.