Plz help my teacher going to give me a ZERO plz I will mark you brainlist

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

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.