Published 11.05.2018 on subject Mathematics by Guest

Form a sequence that has two arithmetic means between 13 and 88. a. 13, 38, 63, 88 c. 13, 25, 25, 88 b. 13, 88, 163, 238 d. 13, 50.5, 88

Answered by Guest

The formula to useĀ for this problem is this: an = a1 + (n - 1)d
Where:
a1 = 13
a4 = 88
n = 4
d = ?
Thus, we have:
88 = 13 + (4 - 1)d
88 - 13 = 3 * d
75 = 3d
75/3 = d = 25
Therefore, d = 25.
This means that, a difference of 25 exist between successive number in the sequence. So the right sequence is 13, 38, 63, 88.
The correct option is A.