Answer
Statement p is true.
Statement q is true.
Statement r is false.
Step-by-step explanation
We are asked to evaluate the true elements of statement p, q and r. Taking each of them one at a time,
p: 12 + (–4) = 8
12 - 4 is indeed equal to 8. Hence, statement p is true.
q: A right angle measures 90 degrees.
A right angle is an angle that measures 90 degrees. Hence, statement q is true too.
r: A triangle has four sides.
A triangle has three sides. Hence, statement r is not true, that is, it is false.
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