I WILL GIVE BRAINLIEST !! PLEASE HURRY IM TIMED

Mathematics

2 answers:

Sonbull [250]3 years ago

8 0

Answer:

alexs family by 10 Mph

Step-by-step explanation:

scZoUnD [109]3 years ago

5 0

Alex’s family by 10 miles per hour

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In a right triangle the leg opposite to the acute angle of 30° is 7 in. Find the

Kobotan [32]

Answer:

in the explanation

Step-by-step explanation:

In a 30-60-90 triangle, the ratio of the leg opposite to 30 to the leg opposite to 60 to the hypotenuse is 1: $\sqrt{3\\}$ :2.

So, the 7 inch leg is the 1, the other leg is 7 $\sqrt{3}$ in and the hypotenuse is 14 in.

Hope this helps!

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3 years ago

What is x? I’ll make you the brainliest

lord [1]

Answer:

Step-by-step explanation:

If EG=8, OE=4

x/12=4

x=4(12)

x=48

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3 years ago

Find dy/dx and d2y/dx2. x = cos(2t), y = cos(t), 0 < t < π

pogonyaev

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\frac{\mathrm dy}{\mathrm dt}}{\frac{\mathrm dx}{\mathrm dt}}$

$y=\cos t\implies\dfrac{\mathrm dy}{\mathrm dt}=-\sin t$
$x=\cos2t\implies\dfrac{\mathrm dx}{\mathrm dt}=-2\sin2t=-4\sin t\cos t$
$\implies\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{-\sin t}{-4\sin t\cos t}=\dfrac14\sec t$

Let $z=\dfrac{\mathrm dy}{\mathrm dx}$ . Then

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm dz}{\mathrm dx}=\dfrac{\mathrm dz}{\mathrm dt}\dfrac{\mathrm dt}{\mathrm dx}=\dfrac{\frac{\mathrm dz}{\mathrm dt}}{\frac{\mathrm dx}{\mathrm dt}}$
$\implies\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\frac{\mathrm d}{\mathrm dt}\left[\frac14\sec t\right]}{-4\sin t\cos t}=\dfrac{\frac14\sec t\tan t}{-4\sin t\cos t}=-\dfrac1{16}\sec^3t$