50 points 7th grade math ! asap

1. sam solved the following problem:

-4x + 5 > 29
-4x + 5 - 5 > 29 - 5
-4x > -24
-4x/-4 > -24/-4
x > 6

what were his two mistakes? (3 points)

2. hillary buys 3 pounds of gala apples and some granny smith apples. both kinds of apples cost $4.50 per pound. the total cost is $24.75. how many pounds of granny smith apples did hillary buy? write and solve a variable equation. show your work.
(4 points)

3. tell whether each equation has one solution, infinitely many solutions, or no solution. (3 points)

6x + 8 = 6(x + 2)
10x = 15 + 5x
x + 11 = 8x + 11 - 7x