4 years ago

Solve. 45 – 4r = 45 – 4r

1 answer:

7 0

This answer can be any real number, as both sides are equal to each other. Try inserting different numbers in here, and you should realize any of them would work

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What is -310.5 as a fraction

Elza [17]

Answer:

- 310.5/100

Step-by-step explanation:

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3 years ago

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Ernest earned $8.55 per hour plus an additional $90 in tips waiting tables on Friday. He earned at least $160 in all.

kvasek [131]

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3 years ago

a store pays $31 for hockey stick. The store marks up the price by 45%. What is te amount of the mark-up

Effectus [21]

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$13.95

Step-by-step explanation:

31*9/20=279/20=27.9/2=$13.95

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3 years ago

Write an equation to represent the situation below. Then explain what each part of the equation represents (the variables, the c

gizmo_the_mogwai [7]

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3 years ago

F(x)= (5x/sinx) - 3xsinx Solve for dy/dx at x = Pi over 2

gogolik [260]

Answer:

$(\frac{dy}{dx})x_{= \frac{\pi }{2} } = f^{1} (\frac{\pi }{2} ) =2$

Step-by-step explanation:

Step(i):-

Given that

$f(x) = \frac{5x}{sinx} -3xsinx$

Apply (UV )¹ = UV¹+VU¹

$\frac{d}{dx} (\frac{U}{V} ) = \frac{V U^{l} -VU^{l} }{V^{2} }$

Step(ii):-

$f^{1} (x) = 5\frac{sin x(1)-x(cos x)}{sin^{2}x } - 3(x cos x + sin x(1))$

put $x = \frac{\pi }{2}$

$f^{1} (\frac{\pi }{2} ) = 5\frac{sin \frac{\pi }{2} (1)-\frac{\pi }{2} (cos \frac{\pi }{2} )}{sin^{2}(\frac{\pi }{2} ) } - 3(\frac{\pi }{2} cos \frac{\pi }{2} + sin(\frac{\pi }{2}) (1))$

we know that

$cos(\frac{\pi }{2}) = 0$

$sin(\frac{\pi }{2} ) = 1$

$f^{l} (\frac{\pi }{2} ) = \frac{5(1-0)}{1} -3(0+1)$

$f^{1} (\frac{\pi }{2} ) = 5-3 =2$

Final answer:-

$(\frac{dy}{dx})x_{= \frac{\pi }{2} } = f^{1} (\frac{\pi }{2} ) =2$

6 0

3 years ago