4x-30=180
180-30
4x=150
150/4
37.5
x=37.5
Answer:
q = 7
Step-by-step explanation:
Given
18 - 2q = 4 ( Isolate the term in q by subtracting 18 from both sides )
- 2q = - 14 ( divide both sides by - 2 )
q =
= 7
Answer:
4 hours
Step-by-step explanation:
For three visits, the electrician earned $40 × 3 = $120 in "per-visit" charges. For working x hours, he earned 20x in "per-hour" charges. The total of these came to 50x:
120 +20x = 50x
120 = 30x . . . . . . . . subtract 20x
4 = x . . . . . . . . . . . . . divide by 30
The electrician worked 4 hours that day.
The first one is 0,5 the second one is 1,3 last one is 2,1