When a number is decreased by 17%, the result is 15. What is the original number to the nearest tenth?
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Answer:
The coordinates of 8i on the a complex plane are
(0, 8i)
That's vertex form for a parabola and we read off vertex (p,q) as
Answer: Vertex (5,7)
The negative <em>a</em> tells us this is a downward opening parabola (upside down from the usual . I remember CUP - Concave Up Positive; here <em>a </em>is negative so not a cup, instead concave <em>down.</em> The same rule applies to second derivatives in calculus so memorize it now and use it later.
Answer: downward