Answer: A & C
Step-by-step explanation: A. Two parallel lines are coplanar.
C. Two planes that do not intersect are parallel.
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19+ 17 = 36
right angle = 90°
90 - 36 = 54
I think it is 350(1.2)^t because you take the starting amount (350) and then multiple it by the growth rate (which is 20%, but when added to 100 and the put into a decimal is 1.2) raised by the number of hours (t).
I hope this helps.