The paper feed on a copying machine has room for a stack of paper 4.0 cm high. if 10sheets of paper are 0.08 cm thick, how many sheets will fit? (hint'how thick is 1 sheet? )

Consider the function f(x)=−2/3x+5 . what is f(1/2) ? enter your answer, as a simplified fraction, in the box. f(1/2)=

How do you solve a question like this?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?