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3 years ago

12

Jeff has 30 problems to do for math homework, and he fhinshed 60% of them before play practice. How many problems did he finish

before play practice?

1 answer:

wlad13 [49]3 years ago

3 0

To find the percentage you need to multiply 60*30 and then divide by 100 or just multiply 0.6*30

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If f(x) = 3x - 1 and g(x) = x + 2, find (f- g)(x).

VMariaS [17]

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(f-g)(x) would be 2x-3

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3 years ago

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Use chain rule to find dw/dt w=ln(x^2 + y^2 + z^2)^(1/2) , x=sint, y=cost, z=tant

son4ous [18]

The chain rule states that

$\dfrac{\mathrm dw}{\mathrm dt}=\dfrac{\partial w}{\partial x}\dfrac{\mathrm dx}{\mathrm dt}+\dfrac{\partial w}{\partial y}\dfrac{\mathrm dy}{\mathrm dt}+\dfrac{\partial w}{\partial z}\dfrac{\mathrm dz}{\mathrm dt}$

Since $\ln(x^2+y^2+z^2)^{1/2}=\dfrac12\ln(x^2+y^2+z^2)$ , you have

$\dfrac{\partial w}{\partial x}=\dfrac x{x^2+y^2+z^2}$
$\dfrac{\partial w}{\partial x}=\dfrac y{x^2+y^2+z^2}$
$\dfrac{\partial w}{\partial z}=\dfrac z{x^2+y^2+z^2}$

and

$\dfrac{\mathrm dx}{\mathrm dt}=\cos t$
$\dfrac{\mathrm dy}{\mathrm dt}=-\sin t$
$\dfrac{\mathrm dz}{\mathrm dt}=\sec^2t$

Also, since $x^2+y^2+z^2=\sin^2t+\cos^2t+\tan^2t=1+\tan^2t=\sec^2t$ , the derivative is

$\dfrac{\mathrm dw}{\mathrm dt}=\dfrac{\sin t\cos t}{\sec^2t}-\dfrac{\sin t\cos t}{\sec^2t}+\dfrac{\tan t\sec^2t}{\sec^2t}$
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3 years ago

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vladimir1956 [14]

The stock market increased 75 point: = +75 or 75

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3 years ago

What is (3 x 20) + 9 and what is (4 x 100) + 20?

madreJ [45]

Answer:

(3 x 20) + 9 = 69

4 x 100) + 20 = 420

7 0

3 years ago

Read 2 more answers