Answer:
B. 4200
Step-by-step explanation:
A suitable calculator can add the terms for you. (See attached)
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The first term is 69, and the common difference is 75-69 = 6. The general term is ...
an = a1 +d(n -1)
an = 69 +6(n -1)
Then the 28th term is ...
a28 = 69 +6(27) = 231
The average term is (a28 +a1)/2 = (231 +69)/2 = 150.
The sum is the number of terms multiplied by the average term:
sum = 28×150= 4200
Y=-11. 2×-4 is -8, and -8-3 is -11.
Answer:
Sorry the screenshot is black but i would like to help if you can repost, it?
Step-by-step explanation:
<span>the answer
The triangle congruence says triangle ERT is congruent to triangle CTR. </span>