Bernard weighs 7.5 pounds at birth. assuming his development proceeds normally, he should weigh about pounds by his first birthday. 22.5 24.5 20.5 18.5

Given Bernard weighs 7.5 pounds at birth.The question is asking us to assume that  Bernard development proceeds normally.We need to find Bernard birth after a year.

It is observed that birth of a child triples or is thrice (3 times ) the weight at birth.As Bernard is weighing 7.5 pounds so he will triple or be 3times of this weight.

Bernard weight after a year= 3x7.5=22.5 pounds.

5x+10 is the correct one

hope this