A baby weighed 7.25 lb at birth. At the end of 8 months, the baby weighed 2 1/2 times its birth weight. How many pounds did the baby weigh at the end of 8 months?

Simply multiply the baby's original weight, which is 7.25 lbs, by 2.5

7.25lbs x 2.5 = 18.125 lbs

The baby weighted 18.125 pounds at the end of 8 months.

Hope this helps  

Step-by-step explanation:

Its 18.125

Because if you multiply 7.25 times 2 plus add the half which was 3.625 it equals 18.125

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.