magicgeek4980
12.10.2021 •
Mathematics
a variable x has a normal distribution with mean 54 and standard deviation 5. approximately what percentage of the observations will fall between 44 and 64?
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Ответ:
vertex of the parabola
Step-by-step explanation:
v(t) = −2x²+ 22x + 280
v = value of her investment
t = time in weeks.
(a) What key feature of the function tells us when her investment was worth the most?
worth the most = highest value, so at the vertex of the parabola.
xvertex = -b/2a
yvertex = -Δ/4a