5. let a be an m x n matrix. recall that the null space of a matrix a, written null(a), is the set of all r" such that ax 0. show that null(a) is a subspace of rn.

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. after tax the total is 45.99. what percentage of the subtotal is the total?

Which expression is equivalent to -5(3x - 6/7)