PLEASE HELP FAST 3) a) Find an equation that represents the area of a garden with these dimensions. Length = x+4

Width = 3x-1

b) Find an equation the represents the perimeter of this garden.

c) Calculate the area and the perimeter of this garden if x =5 m.

100 points, hi, i’m not sure what to do here,the data doesn’t seem to be quadratic .? can anyone me, in advance

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?