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(-6, 1) and (-2,1)

Step-by-step explanation:

*the equation for this hyperbola since (x-h)² is in the second numerator instead of the first, is (y-k)²/a² - (x-h)²/b² = 1.

So, since we know that for this hyperbola, the vertices are going to be equal to (h±a,k). h is -4 and a = 2 (just find the square root of 4). k is 1.

So our coordinates are (-6, 1) and (-2,1).

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

step-by-step explanation: