Hello,
x=5 cos t and y=5 sin t are the parametric equations of the circle of center (0,0) with radius=5
x²=25*cos²t
y²=25*sin²t
x²+y²=25(cos²t+sin²t)
==>x²+y²=25
A proportional relationship is one in which two quantities vary directly with each other. We say the variable y varies directly as x if:
y=kx
for some constant k , called the constant of proportionality .
(Some textbooks describe a proportional relationship by saying that " y varies proportionally with x " or that " y is directly proportional to x .")
This means that as x increases, y increases and as x decreases, y decreases-and that the ratio between them always stays the same.
First you want to find 2√5+3√7, which is ≈12.40938989. Then you would square that number and you would get ≈153.9929574 rounding to the nearest number you would get ≈154.
So the answer is ≈154.
Answer:
B
Step-by-step explanation:
