Write a number to create a different expression that is equal to (3+4)+5

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Let f(x)=2x and g(x)=2x. graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ?me asap

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?