The answer is the first one because you have to multiply the outsider five to the other numbers inside the parenthesis. You don't add them or subtract them because they don't have the same variable
We can set up an equation: x * (x + 5) = 564, where x is the length of the rectangle we are trying to solve. Using the quadratic formula to solve this, we eventually come up with approximately 21.38 as a value for x. We can verify this by typing 21.38 * (21.38 + 5) into a calculator and seeing that it approximately equals 564.
Cosine is

which applies to a right triangle. I hope that helps you.
Answer:
8,417.769
8416 + 0.28 is just adding 28 at the end so 8416.28
now 8416.28 + 1.489 is 8,417.769
the awnser is 8,417.769
Step-by-step explanation: