Answer:
x=-2
Step-by-step explanation:
Answer : The fifth term in the sequence is -2.
Step-by-step explanation :
As we are given that the expression to calculate the
term.
The expression is as follows:

where,
n is the number of term
Given:
n = 5
Now putting the value of n in the above expression, we get:




Therefore, the fifth term in the sequence is -2.
18.386 rounded to the nearest hundredth would be 18.39
your calculations for volume (pi x r^2 × h) and surface area (2 × pi × r (h+r)) are correct. However your ratio are incorrect. From the formulas the ratio of surface area to volume would be r×h:2(h+r)