Answer:
1) 12
2) an=n²+n-6/2
3) the 25th term
Step-by-step explanation:
check explanation in the attached image
The weight of the last child is 36 lbs.
<h3>How to calculate the mean?</h3>
The average weight of the three children is 60 lbs. The total weight will be:
= 60 × 3
= 180 lbs.
When another child is added, the weight is 54lb. The total weight will be:
= 54 × 4
= 216 lbs
The weight of the last child will be:
= 216 - 180
= 36 lbs.
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Formula is needed to solve problem
3m/2n*n^3/6
= (m*n^3)/ 4n
= mn^2/4
The final answer is mn^2/4~