Nina glues pictures on a rectangular piece of cardboard. the piece of cardboard is 20 inches long and 9 inches wide. each rectangular picture is 7 inches long and 4 inches wide. she glues 3 pictures on the cardboard. the pictures do not overlap. what is the area of the cardboard that is not covered by pictures?

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2