Help please! 20 points for whoever answers and Brainiest for whoever gets it right!

4s/2

Step-by-step explanation:

Since it's a square, all sides are s.

Multiply s by 4, to get 4s.

Now you do 4s/2

I'm not 100% sure but I tried :)

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c