Conjecture (fog)(x), if f(x)=13x-9 and g(x)=9x+13

(fog)(x) = 117x + 160

Step-by-step explanation:

∵ f(x) = 13x - 9

∵ g(x) = 9x + 13

∵ (fog)(x) means ⇒ f(g(x)) ⇒ g(x) is the value of x in of f(x)

∴ (fog)(x) = 13(9x + 13) - 9 = 117x + 169 - 9

∴ (fog)(x) = 117x + 160

No, he made a mistake solving for the volume of both figures.

Step-by-step explanation:

You can just look at the formula and see it

Volume of a square pyramid : V=1/3bh , he forgot to use the 1/3. Volume of a cylinder: πr^2h , he forgot the π