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B: 1/5

Step-by-step explanation: To find the probability of a students favorite class being history, we add all of the students to a sum. When added correctly, you should have a sum of 60 students. The next thing we do is create a fraction of the amount of students that enjoy history. This makes our answer 12/60. While this is correct, it makes any other possible calculations a bit more difficult so we must simplify it. To simplify you simply divide the fraction until you can no longer divide it with common factors. So I divided 60 by 12 to get 5. Knowing that this is one number, we would put 1 as a numerator and 5 as the denominator. This means our answer is 1/5 or B.

50-38=12

step-by-step explanation:

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.