Answer:
your answer is a and d
Step-by-step explanation:
we know that
Step 
in the right triangle XYZ
Applying the Pythagorean Theorem
Find the value of ZY


Step 
in the right triangle XYZ
Find tan
°
we know that

in this problem
opposite side angle
is ZY
adjacent side angle
is XZ
so

therefore
the answer is

Answer:
x=3 meters
Step-by-step explanation:
step 1
Find the area of the rectangular pool

we have

substitute

step 2
Find the area of rectangular pool including the area of the walkway
Let
x ----> the width of the walkway
we have

substitute

step 3
Find the area of the walkway
To find out the area of the walkway subtract the area of the pool from the area of rectangular pool including the area of the walkway
so

step 4
Find the value of x if the area of the walkway equal the area of the pool
so

Solve for x

Solve the quadratic equation by graphing
The solution is x=3 meters
see the attached figure
2X+8=x-6
2x-x=-6-8
X=-6-8
X=-14