Afriend decides that 4(x+3)=4x+3. explaine to your freind that 4(x+3)= 4x+12

It would be 4(x+3) = 4x+12 because you are multiplying each number in the parenthesis by the outside number. Which is 4.
4 * x = 4 
4 * 3 = 12

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.