shygirltn
23.04.2020 •
Mathematics
In a skydiving formation with r rings, each ring after the first has twice as many skydivers as the preceding ring. The formation for R=2 is shown.
a.) Let an be the number of skydivers in the nth ring. Find a rule for an.
b.) Find the total number of skydivers if there are R=4 rings.
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Ответ:
It must have the same slope as the given line, so
m = -A/B = -1/-2 = 1/2
So far, we have
y = mx + b = x/2 + b
Use the given point to find b.
4 = -2/2 + b = -1 + b
b = 5
y = x/2 + 5
Multiply through by 2.
2y = x + 10
Standard form:
x - 2y = -10