Answer: the surface area is 216cm
Step-by-step explanation:
It is given in the question that the solid is a cone with height of 16 units and radius of 7 units .
The formula of volume of cone is

To find the volume, we substitute the given values of r and h and use 3.14 for pi. That is

And that's the required volume of the cone .
7 because 7x3= 21 and 21 + the 7 cats comes to an equal 28
You have (-3 +i)/(7 + i) so you need to remove the i from the numerator, so you have to multiply by 7-i and you get
(-22 + 4i)/50 which can be simplified to
(-11 + 2i)/25
I have to think this through.... I will get back later 2.222