Find the weight of a package that can be shipped for $12.50 using the equation y = 3x + 5 where y is the total cost and x is the weight of the package.

2.5

Step-by-step explanation:

So you know that y is the total cost so you can put $12.50 in to substitute y.  You then end up with the equation $12.50 = 3x+5.  Nest you need too get x by itself so subtract 5 from the left and subtract 5 from the 12.50 which leaves you with $7.50 = 3x.  Next we have too divide both &7.50 and 3x by 3 to get x by itself.  This leaves you with 2.5 = x.  Therefor your answer is 2.5.

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above

i belive those are the ones that are under 90 degreese.