Charlie made 50$ at her part time job last week. this week she made 75$.check the opionions that apply to this statement .
a.50% change
b decrease
c increase
d $50

What is the y intercept of f(x)=(1/2)^x?

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?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?