solve for y, i’m really confused on this it would be great if i could get a explanation and a answer !!

A. 5

Explanation:

The triangle given is a right triangle. To solve for y, apply the pythagorean theorem which is given as a² + b² = c².

Where,

c is the hypotenuse/longest side = 13

a = 12

b = y

Plug in the values

12² + y² = 13²

144 + y² = 169

y² = 169 - 144

y² = 25

Square both sides

y = √25

y = 5

accelerated heartbeat, raise in blood pressure, slow in digestion, raise in blood sugar and perspiration. (myers' psychology for ap 2nd edition pg 87)