What is a1 of the arithmetic sequence for which a3=10 and a51=-182.

Step-by-step explanation:

We are asked to find the formula of arithmetic sequence, whose 3rd term is 10 and 51st term is .

We know that an arithmetic sequence is in format , where,

= nth term of sequence,

= 1st term of sequence,

n = Number terms in the sequence.

d = Common difference.

Upon substituting our given values, we will get two equation as:

Subtracting equation (2) from equation (1), we will get:

Switch sides:

Upon substituting in equation (1), we will get:

Upon substituting and in arithmetic sequence formula, we will get:

Therefore, our required formula would be .

a box 3 3/4 feet long or 4+ feet.

step-by-step explanation:

$12. that is my answer.