For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. x: 3,5,7
y: 6,10,14
a. yes; y=2x
b. no
c. yes; y- 1/2 x
d. yes; y=x+3

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?