We can use Pythagorean's theorem to solve this problem:
a^2 + b^2 = c^2
a and b would both be the same value, since the shape is a square.
The sides of the square would each equal 30.
30^2 = 900
a^2 = 900 which means b^2 = 900
900 + 900 = 1,800
√1,800 ≈ 42.43
A diagonal of the playground would be about 42.43 yards!
The value of x is 17.6. She should have added 5.4 on both sides to get the correct value of x. Then the correct option is A.
<h3>What is the linear system?</h3>
A Linear system is a system in which the degree of the variable in the equation is one. It may contain one, two, or more than two variables.
Kaitlyn solved the equation for x using the following calculations.

and she did the calculation will be

The mistake she did in this equation is the plus sign is removed between the -5.4 and x. And she subtracted 5.4 from 12.2.
The correct solution of the equation is to add both sides 5.4. Then we have

More about the linear system link is given below.
brainly.com/question/20379472
The answer is 75% djckdkskkak
Answer:
Step-by-step explanation:
x2 + 5x + 4 (the area of the rectangle)
x + 2 (the length of one side)
(x2 + 5x + 4)/(x + 2)
do a division of this polynomial and you get; (x + 3) - 2/(x+2), you could leave the answer like this or you could simplify by using the LCM method
= [(x+2)(x+3) - 2]/(x + 2)
checking; (x + 2)*[(x+2)(x+3) - 2]/(x + 2) = (x+2)(x+3) - 2 = x2 +5x + 6 - 2 = x2 +5x + 4 (proven)