I need some help on this one! Thanks!

1.

a. BCA = 30 degrees.

b. BCD = 90 degrees.

c. Because D is in a corner that is equivalent to a right angle or 90 degree angle.

2.

a. LOK = 37 degrees.

b. LOM = 180 degrees.

c. It is obtuse because the angle is greater that 90 degrees and the protractor does not need to be moves. BTW the angle is 143 degrees.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

50-60=10

step-by-step explanation: