Answer:
-1/-6
Step-by-step explanation:
1/6 is equivalent to-1/-6
Let s be the son's age 15 yeasr ago and m the mother's age that year.

We also know that:

Plotting vallues:

Remember that they were that age 15 years ago.
So their actual age is 30 and 60.
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It is 157. Try long division:)
In a quadrilateral the interior angles add up to 360 degrees so if you subtract 90, 53, and 74 from 360 you get the fourth angle
360-90-53-74 = 143
D. 143