Let V=ℝ3 and let H be the subset of V of all points on the plane 7x−3y+6z=−21. Is H a subspace of the vector space V?

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

4+(2+x) can you me solve this problem