History book is $112.89 sales tax is 7.5% math book is 82.99 sales tax is 8.5%

History with tax is $121.36 Math with tax is $90.04

Step-by-step explanation:

it the same steps for math

history

1. $112.89 * 7.5= 846675

2. 846675/100= 8.46675

3. 8.46675+ $112.89= 121.35675

round to $121.36

for math is the same steps expect different numbers you are welcome:) i hope this help.

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4