4.solve for x and y
pls help

x = 4

y = 8

Step-by-step explanation:

this is a 30-60-90 triangle and the sides have a constant ratio

the side across from the 30°∡ is 1

the side across from the 60°∡ is √3

the side across from the 90°∡ is 2

In this problem we can find 'x' by setting up this proportion:

x/12 = /1

cross-multiply:

x = 12

x = 12/

since we don't like to leave radicals in the denominator, we can multiply both numerator and denominator by to get:

12 ÷ ·    (· = , which equals 3)

so we have 12/3, which is 4

The 'y' value will be twice the 30° side, so 8

a) 15/7

step-by-step explanation: