Answer:
C. 70
Step-by-step explanation:
x + (x + 40) = 180
2x + 40 = 180
2x = 140
x = 70
4, 2.75, 1.5, 0.25, - 1, - 2.25, ...............
Using the recursive formula with f(1) = 4, then
f(2) = f(1) - 1.25 = 4 - 1.25 = 2.75
f(3) = f(2) - 1.25 = 2.75 - 1.25 = 1.5
f(4) = f(3) - 1.25 = 1.5 - 1.25 = 0.25
f(5) = f(4) - 1.25 = 0.25 - 1.25 = - 1
f(6) = f(5) - 1.25 = - 1 - 1.25 = - 2.25
Sequence is 4, 2.75, 1.5, 0.25, - 1, - 2.25, .......
Standard deviation = 2.599519186
Round to nearest hundredth = 2.59✓
I don't know if this is all correct, but I tried
