7:
3/8 = 6/x
3x = 48
x = 16
8:
4/5 = (x+7)/40
160 = 5x + 35
5x = 125
x = 25
9:
3/8 = 12/(x-3)
3x - 9 = 96
3x = 105
x = 35
10:
4/1 = (3x+6)/x
4x = 3x + 6
x = 6
First you need to find the area of the floor to know how much wood you need
Area=lengthxwidth, so A=40x14.5 which equals 580 square ft
With a floor that's 580 square ft and the boxes cover 18 Sq ft each then all you have to do is 580/18= 32.222 and because you can't buy .222 of a box you need to round up to 33 boxes
Answer:
128 degrees because it is a suplimentary angle which adds up to be 180...so you subtract 180-52 and you get 128
The expression 30 + 12 can be rewritten as 2x(13+8)