What is an expression for the number of feet in 100 inches

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax