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Softa [21]
4 years ago
8

Subtract 28.9 − 9.25 =_____

Mathematics
2 answers:
yaroslaw [1]4 years ago
8 0
19.65 hope this helps :)
Julli [10]4 years ago
3 0
Hey There!

Here is your answer:

Your answer is: =19.65

How:

28.9
-
9.25
_____
19.65

If you need anymore help just ask me:

Hope this helps!
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z^2=x^2+y^2\\\\z=\sqrt{x^2+y^2}\\\\x=dx*t+x_i, x_i=0\\\\y=dy*t+y_i\\\\y_i=160\ ft

#Take the derivative of the first equation and solve for dz:

d(z^2=x^2+y^2)\\\\2z*dz=2x*dx+2y*dy\\\\dz=\frac{x*dx+y*dy}{z}\\\\dz=\frac{x*dx+y*dy}{\sqrt{x^2+y^2}}\\\\\\dz=\frac{dx^2*t+dy(dy*t+160)}{\sqrt{(dx*t)^2+(dy*t)}}

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dz=\frac{7*66^2+14(14*7+160)}{\sqrt{(66*7)^2+7*14+160}}\\\\=73.78

Hence, the rate of change of the distance between the motorcycle and the balloon 7 seconds ​later is 73.77 ft/s

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