I'll show you how I do it,hope you'll like it.
5:7, 5+7=12
5/12×48 =20
7/12×48=28
answer=
5:7
= 20:28
hope it helps.....
11)
3x = 180
x = 60
12)
6x + 18 = 180
6x = 162
x = 27
Answer:
9
Step-by-step explanation:
x didn't change in value, y changed by 9
the distance between the two points is 9
Answer:
4000 
Step-by-step explanation:
V = 1/3(Bh) where B is the area of the base and h is the height of the pyramid
B = 20(20) = 400 h = 30
V = 1/3(400)(30) = 4000 