The answer is c because all you are doing here is subbing the variable r for 5b.
The answer to ur question is d: 6x6x6x6
Answer:
y=5x + 21
Step-by-step explanation:
y=5x×b
6= -15+b
b=21
The 2nd step, you're supposed to combine like terms (20h and 2h) but not the 5 because it doesn't have a h next to it.
Answer:

Step-by-step explanation:
2x + 17.6 = 6
Subtracting both sides by 17.6
2x = 6 - 17.6
2x = -11.6
Dividing both sides by 2
x = -11.6 / 2
x = -5.8