Answer: V=πr^2h=π·4^2·8≈402.12386cm^2
Answer:
20 + (-45) = -25
Step-by-step explanation:
its the first one
The sum you are trying to understand is this.
Remember that in general when you have a geometric series
you have that
and that equality is true as long as .
Therefore here we have
and
Therefore we can use the formula and