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DrippyGanja
29.09.2019 •
Mathematics
Express the surface area a (total of all six sides) of a cubical box in terms of the volume v of the box.
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Ответ:
V = a³
That means : a = ∛ V
The surface area of the box:
A = 6 a² ( all 6 sides )
A = 6 ∛ V²
Ответ:
We have 2 situation one with wind and one against wind
Speed = x , W= Wind
*case 1 ( With Wind) *case 2 ( Against Wind)
t=3 hr d= 2160 m. Rate = x + W t=4 hr d= 2160 m. Rate = x - W
Distance = Rate * Time
2160 = (x+W) * 3 2160 = (x-W) * 4
2160 / 3 = (x+W) 2160/4 = x-W
720 = x+W 540 = x-W
NOW 2 equations solve by substitution or elimination. ( i did Elimination)
720 = x+W
540 = x-W
1260 = 2x (W was eliminated) solve for x
x = 630 Speed of the Airplane
now solve for W. W = 90 Speed of the Wind
hope this helps