Let's compute the two factors separately: as for "the sum of -13/5 and 12/7", we have to rewrite the two fractions so that they have the same denominator. Since the least common multiple of 5 and 7 is 35, we will change both fractions so that they have denominator 35:

So now we can sum them:

Multiplication is easier, since you just have to multiply numerators and denominators with each others:

Finally, we must divide the two fractions. Dividing by a fraction is the same this as multiplying by the inverse of that fraction, i.e. we have to switch numerator and denominator:

Answer:
missing angle = 70 degrees
Step-by-step explanation:
180 -120 =60, because supplemenatery angles add up to 180 degrees.
sum of all angles of a triangle = 180. so 180-60-50=70 degrees
Answer:
PT = 30.5
Step-by-step explanation:
Since T is the midpoint, ...
PT = TQ
5x +3 = 7x -8 . . . . substitute the given expressions
11 = 2x . . . . . . . . . add 8-5x
5.5 = x . . . . . . . . . .divide by 2
We want PT, so we can us this value of x in its expression:
PT = 5(5.5) +3 = 27.5 +3
PT = 30.5
Answer: The answer is 3 children.
Step-by-step explanation: 16:4 is considered 4:1 hence there were 4 of 16 children have been elementary school students. If you take a look at the ratio closer you may see it’s a division of 4, therefore 12 divided by 4 equals 3 children.