CAN SOMEONE PLEASE HELP ME!! are the following 1-1 functions? if it is 1-1 find the inverse. for parts b & c if needed restrict the domain to make it 1-1. state domain and range of both original and inverse and sketch a graph of the function and its inverse.

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?

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9