1. B 2. C 3. -7+14= 14-7 <span>A </span>4. -3+9= 9-3 <span>C </span>5. -4+-12= -16<span> B </span>6. 7+-9= -2 <span>D
7.You have to add all of them instead of subtracting. Then if the second integer is negative you have to make it positive or positive you have to make it negative. 8</span><span>+-4= 4 </span>⇔ C 8. -9+-5= =-14 9. 4+-1= 3 10. 7+4= 11
509 gallons as 815 gallons divided by 32 = 25.468 and we multiply by 20 to get 509.375 where we round down at 509 to find full gallon, anything less (via decimal) is not a full gallon.