Allie bought some dvds for $14.99 each. which expression below represents allie's cost for d dvds?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Use the net as an aid to compute the surface area of the triangular prism. a) 550 m2 b) 614 m2 c) 670 m2 d) 790 m2