Ill give 30 !
7.4 + 8.2 - 3.2 - 2.4
1) rewrite subtractions using additive inverse.
2) use the commutative property to group similar numbers.
3) use the associative to group the first pair of numbers.
4) simplify
5) use the associative property to group the last pair of numbers.
6) simplify

answer:

= 7.4+8.2-3.2-2.4

= 15.6-3.2-2.4

= 12.4-2.4

= 10

step-by-step explanation:

Actual                                      2/3

30 inch. by 12 inch               240 inch²

30 inch. by 18 inch               360 inch²

12 inch. by 15 inch                  120inch²

18 inch. by 15 inch                 180inch²

Step-by-step explanation:

The answers are given in the same line .

Actual                                                      1/3                          2/3

30 inch. by 12 inch                                120 inch²                 240 inch²

30 inch. by 18 inch                                180 inch²                 360 inch²

12 inch. by 15 inch                                  60 inch²                  120inch²

18 inch. by 15 inch                                90 inch²                    180inch²

We  find the areas and multiply by 2/3 to get the answers

30 * 12= 360 inch²

2/3 * 360 = 240 inch²

30 * 18= 540 inch²

2/3 * 540 = 360inch²

12 * 15= 180 inch²

2/3 * 180 = 120 inch²

18 * 15= 270 inch²

2/3 * 270 = 180inch²