Tom buys a new phone service. it costs $20 to install, and then costs $15 a month. write an equation to show the cost of the phone (y) for any number of months (x).
a.
y=15x+20
b.
y=20x+15
c.
y=20x-15
d.
15x+20y=35

Which account has the highest effective annual interest rate? not necessary but show how you got your answer.a. account 1: interest is compounded quarterly at an annual rate of 4.20%.b. account 2: interest is compounded monthly at an annual rate of 4.15%.c. account 3: interest is compounded semiannually at an annual rate of 4.10%d. account 4: interest is compounded annually at a rate of 4.25%.