Find the value of x.
and find the value of y.

the unknown side is 12, and the angle y is 67.4°

Step-by-step explanation:

this is a right triangle with side 5 and hypotenuse 13.  By the Pythagorean Theorem, 13² = 5² + opp², where "opp" is the side opposite Angle y.

Then 169 = 25 + opp² and so opp = √144 = 12.

Now to find the angle y:  

              5

cos y = = 1.176 radians

              13

Converting 1.176 radians to degrees, we get

1.176    180°

* = 67.4°

   1        π rad

$20.01

step-by-step explanation:

the sale price is (1.00 - 0.77)($87), or 0.23($87), or $20.01.