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

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.