400% of 8 is 32, so it is greater than 10, less than 100
1/2, 3/8, 5/16, 9/12, and 30/64. Hope this helped!
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
The slope is 7
slope equation: y=mx+b
m=slope
