Answer:

Start by breaking the radicand into assumed positive values.

Simplify.

Use similarity property:
14 / (14+6) = 21 / (21 + (x+4))
14/20 = 21/(x+25) cross multiplication property
14*(x+25) = 20*21
14x + 350 = 420
14x = 70
x = 70/14 = 5.
Let u be the set of all words containing 7 letters(26 letters to the power 7)
Answer:
402.12
Step-by-step explanation:
V=πr2h= π·42·8≈402.12386