Question

An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.What is the explicit rule for this situation, and how many marbles will be in the 10th row?Drag and drop the answers into the boxes to match the situation.Explicit ruleNumber of marbles in the 10th rowAn = 11 + 11n, An = 12 + n, An = 11 + n, An = 12 + 10n, 19, 20, 21,

Answer 1

Answer:

A(n)=11+n

Step-by-step explanation: took test

Answer 2

The explicit rule for the number of marbles in 10th row is An= 12+ n-1.

Step-by-step explanation:

• Total number of rows = 10 rows
• The number of marbles in the 1st row = 12 marbles
• One marble is added to each successive row

Therefore, for the remaining 9 rows out 10 rows ⇒ 9 marbles are added.

• The number of marbles in the 10th row = 12+9 = 21 marbles.
• The explicit rule is An = 12 + n-1

For n= 10, then

⇒ A10 = 12 + (10-1)

⇒ A10 =12+9 = 21