Answer:
22
Step-by-step explanation:
Answer:
x = -1
Step-by-step explanation:
3x - 15 = -18
Add 15 to both sides;
3x = -3
Divide both sides by 3;
x = -1
To answer this question we can propose the following equation:

Where:
x is the number of weeks elapsed.
d is the debt depending on the weeks.
Robert promised to pay at least $ 67 each week.
Therefore, after 5 weeks the debt of rober should be:


Then scenario A) is possible because
.
After 6 weeks:


Then scenario B) is possible because
.
After 7 weeks


Then scenario C) is possible because
.
After 8 weeks


So scenario D) is NOT possible because 
Finally the correct answer is option D.
10:4,9:7 =
10:0,7 =
100:7 = 14,2857
The answer is 6 11/12
4 1/6 = 4 2/12
2 3/4 = 2 9/12
4 2/12 + 2 9/12 = 6 11/12