Please help

a = 12 yd

Step-by-step explanation:

From the pythagoras theorem

(hypotenuse)^2 = side^2 + side^2

20^2 = 16^2 + a^2

400 = 256 ^ a^2 subtract 256 from both sides

144 = a^2 the square root of 144 is 12

12 = a

sinn is the total amount of students now and m were the students before, you subtract them both (n-m) and divide that by m. then, since to get a percentage from a fraction you have to multiply by 100, your answer should look like this: n-m/m*100

step-by-step explanation: