A lotion is made from an oil blend costing $1.50 per ounce and glycerin costing $1.00 per ounce. Four

Mathematics

2 answers:

kondor19780726 [428]3 years ago

7 0

Answer:10

Step-by-step explanation:

equation for problem 1.00+1.50=2.50 —> 2.50X4=10

Volgvan3 years ago

5 0

Answer:

Step-by-step explanation:

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Find the mean? Read question rest is done.

Ulleksa [173]

Answer:

I believe its 8

Step-by-step explanation:

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3 years ago

If f(x)=5x-13, then f^-1(x)=

svet-max [94.6K]

Answer:

Hello,

If f(x)=5x-13, then f^-1(x)= $\frac{1}{5x-13}$

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Step-by-step explanation:

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3 years ago

16) Please help with question. WILL MARK BRAINLIEST + 10 POINTS.

Katyanochek1 [597]

We will use the sine and cosine of the sum of two angles, the sine and consine of $\frac{\pi}{2}$ , and the relation of the tangent with the sine and cosine:

$\sin (\alpha+\beta)=\sin \alpha\cdot\cos\beta + \cos\alpha\cdot\sin\beta

\cos(\alpha+\beta)=\cos\alpha\cdot\cos\beta-\sin\alpha\cdot\sin\beta$

$\sin\dfrac{\pi}{2}=1,\ \cos\dfrac{\pi}{2}=0$

$\tan\alpha = \dfrac{\sin\alpha}{\cos\alpha}$

If you use those identities, for $\alpha=x,\ \beta=\dfrac{\pi}{2}$ , you get:

$\sin\left(x+\dfrac{\pi}{2}\right) = \sin x\cdot\cos\dfrac{\pi}{2} + \cos x\cdot\sin\dfrac{\pi}{2} = \sin x\cdot0 + \cos x \cdot 1 = \cos x$

$\cos\left(x+\dfrac{\pi}{2}\right) = \cos x \cdot \cos\dfrac{\pi}{2} - \sin x\cdot\sin\dfrac{\pi}{2} = \cos x \cdot 0 - \sin x \cdot 1 = -\sin x$

Hence:

$\tan \left(x+\dfrac{\pi}{2}\right) = \dfrac{\sin\left(x+\dfrac{\pi}{2}\right)}{\cos\left(x+\dfrac{\pi}{2}\right)} = \dfrac{\cos x}{-\sin x} = -\cot x$