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18. 24%

19. $60.75

Step-by-step explanation:

18. You have to divide the change by the original number to find percent change. In this case you need to do 12/50 = 0.24. Therefore, the discount is 24%.

19. You have to multiply the original price by 0.25 to find how much the discount costs, then decrease the discount cost from the original price, which in this case is 90*0.25 = 22.50, you then have to decrease the sales price by 10% so you have to repeat the same thing with 0.1, so 67.5*0.1 = 6.75, 67.5- 6. 75 = 60.75. The final price is $60.75.

7

step-by-step explanation:

the answer would be 7

37 = ending with 7

unit's digit in the cube..3

56 = ending with 6

unit's digit in the cube..2

133 = ending with

unit's digit in the cube..7

hope it : ( : )