What is part of a line, has one endpoint, and continues in one direction

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?

Prove that 16^4-2^13-4^5 is divisible by 11.