Answer:
b = -2
Step-by-step explanation:
Start with your given:
-3b + 7 = 13
Subtract 7 on both sides:
-3b = 6
Then, divide -3 on both sides and solve:
b = -2
Let the number of chemistry books be x and the number of calculus books be y
total number of books in each case is:
x+y=24
x=24-y.....i
Weight of each case:
2707.2/20
=135.36
thus
4.2x+6.0y=135.36..ii substituting i in ii
4.2(24-y)+6y=135.36
100.8-4.2y+6y=135.36
hence
1.8y=34.56
y=19.2
hence
x=24-19.2
x=4.8
thus the number of chemistry books was 4.8*20=96 number of calculus was
19.2*20
=384 books
I wrote it out this time, so I didn't forget any work like last time. LOL
You seem to have forgotten the size of the wall, but imaginging the average size of a building i think it would take about 2-3 gallons
Answer:
-44
Step-by-step explanation:
3/4 a+24=-9
3/4 a=-9-24
3/4a=-33
multiply by 4
3a=-132
a=-132/3=-44
