-7x-5v^4+5+7x^4+5+9x-=
2x^4+2x+10
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:
im sry i need hte points
Step-by-step explanation:
0.5
Explanation—
So when u do 1/5 + 7/10 u get 0.9 and then when u work out the - u get 0.5
Hope this helped
