10 is the answer because the first step is that you combine like terms so 0.7a-4a=-3.3a so then you divide -3.3 to each side and you negatives cancel out and the answer is 10
For number one I would model it like this: 16 = 2s
For number two just do it like this: .7A - 4A + 5 = -8 -3.3A + 5 = -8 -3.3A = -13 A = 3.9 (approximately)
For number three just remember that a square has for sides so you would just multiply one side length times 4 and set it equal to the whole like this: 4(3x+4) = 76 12x + 16 = 76 12x = 60 x = 5
For number four we'll use "t" to represent the total: 4 (25) + (16*3) = t 100 + 48 = t 148 = t
For number five just distribute and so on: 1/4B - 4 = 7 1/4B = 11 B = 44
