Answer:
Step-by-step explanation:
When doing algebra, you need to reverse operations. When you reverse an operation, you use one of the properties. For example, if you add 3x to undo subtracting 3x, you are using the addition property of equality, because the equation still equal.
4,1
10.5
Step 1:
7 : x = 2 : 3 Equation
Step 2:
2x = 21 Multiply
Step 3:
x = 21 ÷ 2 Divide
x = 10.5
Hope This Helps :)
simplified is 6x-20
0.5 hours
$130 = 1h
$90 = 30m/1h
