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3 years ago

NEED HELP ASAP

Mathematics

2 answers:

iragen [17]3 years ago

7 0

Answer:

2.95

Step-by-step explanation:

SCORPION-xisa [38]3 years ago

4 0

Answer:

B 2.95

Step-by-step explanation:

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Write the equation of the line that passes through the given point and has the given slope:

dimulka [17.4K]

Answer:

Step-by-step explanation:

If a line has slope 0, then it's a horizontal line.

A horizontal line has an equation:

where a is any real number.

The line passes through point (-12, 3) → x = -12, y = 3.

Therefore the equation is

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3 years ago

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PLEASE HELP I DO NOT UNDERSTAND AT ALL ITS PRECALC PLEASE SERIOUS ANSWERS

Elina [12.6K]

You want to end up with $A\sin(\omega t+\phi)$ . Expand this using the angle sum identity for sine:

$A\sin(\omega t+\phi)=A\sin(\omega t)\cos\phi+A\cos(\omega t)\sin\phi$

We want this to line up with $2\sin(4\pi t)+5\cos(4\pi t)$ . Right away, we know $\omega=4\pi$ .

We also need to have

$\begin{cases}A\cos\phi=2\\A\sin\phi=5\end{cases}$

Recall that $\sin^2x+\cos^2x=1$ for all $x$ ; this means

$(A\cos\phi)^2+(A\sin\phi)^2=2^2+5^2\implies A^2=29\implies A=\sqrt{29}$

Then

$\begin{cases}\cos\phi=\frac2{\sqrt{29}}\\\sin\phi=\frac5{\sqrt{29}}\end{cases}\implies\tan\phi=\dfrac{\sin\phi}{\cos\phi}=\dfrac52\implies\phi=\tan^{-1}\left(\dfrac52\right)$

So we end up with

$2\sin(4\pi t)+5\cos(4\pi t)=\sqrt{29}\sin\left(4\pi t+\tan^{-1}\left(\dfrac52\right)\right)$

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3 years ago

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Of the following sets, which represents a function?

Sveta_85 [38]

Answer:

what

Step-by-step explanation:

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3 years ago

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Veronika [31]

Answer:

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CUSTOMERS AT A STORE

Sphinxa [80]

Answer:

480

Step-by-step explanation:

On Thursday there were 400 customers

1/5 of 400 =80

Increase Thursday's amount by 80

400+80 = 480

Friday has 480

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3 years ago