First equation:
5(x+1)=20 —— distribute the 5 to the x and 1
5x+5=20 ——- subtract 5 from 20
5x=15 ———— divide by 5 from both sides
X=3 ————— answer
Second equation:
5x+1=20——— subtract 1 from 20
5x=19 ———— divide by 5 from both sides
X=19/5———— answer in fraction form
X=3.8————- answer in decimal form
You can use a number line to add and subtract
(0.75 * 3.5a) + (0.75 * -6b) = 2.63a -4.5b
The answer is C because it's two negatives. Hope that helped