Determine whether the following curve uses arc length as a parameter. If​ not, find a description that uses arc length as a parameter. r(t)= <4t^2, 8t^2√89t^2>, for 1<= t <= 4

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

Which function has the domain x> -11

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.