Which of the following relations is a function? {(–7, 6), (6, –7), (–7, 9), (10, 3)} {(5, –4), (–4, 5), (–5, 4), (4, –5)} {(2, –3), (–3, 2), (2, 3), (–2, 3)} {(8, –5), (–5, 8), (–5, –8), (–8, 5)}

Every rhombus is a square. true false

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.