What is someone who designs cars called?

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

Interest begins accruing the date of the transaction except for auto loans mortgages credit card cash advances credit card purchases

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.