12 x 80 = 960
18 x 86 = 1548
960 + 1548 = 2508
12 + 18 = 30
2508/30 = 83.6
The class average is 83.6
In your question that first im confused but i arrange if correctly though, in my calculation the possible power of the series is infinity <span>∑ n-0 times the -1 one to the power of n over n+1 times x to the power of n+2</span>
Answer:
45
Step-by-step explanation:
x + x + 2x = 180 {Sum of angles of a triangle}
4x = 180 {Divide both sides by 4}
x = 180/4
x = 45
