<span> $70 / 9 = $7.78
answer
</span><span>$7.78 hourly</span>
let h= history books
science books = s
h=2s there are 2 times as many history as science so to get them equal we double the science
h+s=81 there are 81 total history and science books
2s+s=81 substitute 2s for h in the above equation
3s = 81 combine like terms
s = 27
There are 27 science books
h=2s
h=2(27)
h=54
there are 54 history books
Answer:
If you mean how many hours did she practice because it didn't say how long her lessons are then the answer is 14 hours
Step-by-step explanation:
1 3/4 = 1.75
8 times 1.75 = 14