Let $\mathcal{H}$ be the hyperbola with foci at $(\pm 5, 0)$ and vertices at $(\pm 3, 0),$ and let $\mathcal{C}$ be the circle with center $(0,0)$ and radius $4.$ Given that $\mathcal{H}$ and $\mathcal{C}$ intersect at four points, what is the area of the quadrilateral formed by the four points?

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Step-by-step explanation:

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.