Question

Please help me with question 10 (i). Thanks!

Answer 1

V=πr²h+(2/3)πr³
πr²h+(2/3)πr³=V
πr²h=V-(2/3)πr³
h=(V-(2/3)πr³) / (πr²)
h=V/πr² - 2/3r

Answer i:  h=V/πr² - (2/3)r

Data:
V=245
r=7

h=(245 / 49π) - (14/3)
h=(5/π) - (14/3)
h=(15-14π)/3π
h=-3.075

Answer ii: h=-3.075