Answer:

Step-by-step explanation:
Given



Required
Determine CD
Since Point C is on segment BD, then we have

Substitute x + 4 for BC; 5x for CD and 5x + 7 for BD

Collect Like Terms


Multiply both sides by -1

Substitute 3 for x in 


<em>Hence, the length of CD is 15 units</em>
Answer:
712 liters
Step-by-step explanation:
natural:synthetic = 5:8
For every 13 liters of Petrolyn, 8 are synthetic oil. So:
1157/13=89
89 x 8=712 liters of synthetic oil needed ..............
Answer:
11n
Step-by-step explanation:
7+4 =11
so then 7n+4n=11n