X/5 = 8/9
this is a proportion, so we cross multiply
(9)(x) = (5)(8)
9x = 40
x = 40/9 or 4 4/9
12. She could label it "Polygons with at least one right angle."
13. Draw two vertical lines that cut the rectangle into three vertical sections that are all about the same size (since the horizontal line is already drawn, there will be six sections). The lines should be about 1/3 and 2/3 of the way through the rectangle.
14. Choices B and C. a is parallel to c and b is parallel to d.
If Chad can paint the whole room in 5 hours, in 1 hour he gets 1/5 of it painted. If Cassie can paint the whole room in 3 hours, in 1 hour she gets 1/3 of it painted. If we add those together we can find out how much of the room they can paint together in one hour. 1/5 + 1/3 = 1/x, with x being the number of hours it will take them to paint the room together. Common denominator is 15, therefore, 3/15 + 5/15 = 1/x and 8/15 = 1/x. Cross-multiply to get 8x = 15, so it will take them 15/8 hours, or 1.9 hours to paint the whole room together.
DIvide 11 by 2
11/2
5.5
Multiply that by 7
5.5x7
38.5 feet tall
