She practiced 630 hours in all because you multiply 18x35
Answer:
45
Step-by-step explanation:
a = 78/20=45
Answer:
7n = 12+ 3n
Step-by-step explanation:
The first thing to do is subtract 3n from 7n. This would get you 4n = 12. 4 times 3 equals 12, so n equals 3.
To check your answer. 21 = 12+9. sure enough it matches our answer
The answer is C. 5x - 22y + 8z