If sin y° = 9 divided by c and tan y° = 9 divided by d, what is the value of cos y°? (6 points) cos y° = 9c

cos y°= c divided by d

cos y°= d divided by c

cos y° = 9d

Hi there!

sin(y) = 9/c

tan(y) = 9/d

We know that:

sin(y) = Opposite / Hypotenuse, so c is the hypotenuse and the opposite side = 9

tan(y) = opposite / adjacent, so d is the adjacent

cos(y) = adjacent / hypotenuse, which is d / c

the first one

step-by-step explanation:

just id the test.

(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