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3 years ago

Pls help I'm not sure

Mathematics

2 answers:

ludmilkaskok [199]3 years ago

8 0

Answer:

36x + 4

Step-by-step explanation:

4 (2 + 9x -1) =

8 + 36x - 4

36x + 4

Marizza181 [45]3 years ago

5 0

Answer:

8+36x-4

Step-by-step explanation:

4×2=8

4×9x=36x

4×-1=-4

8+36x-1

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How many solutions does the system of equations below have? y = 3x + 2 Y-2x = 4 a) More than 1 solution b) At least 1 solution c

Lelechka [254]

Answer: c)1 solution

y=3x+2
y=4+2x
put the value of either y in another
3x+2 =4+2x
x=2

7 0

3 years ago

Read 2 more answers

The sum of three numbers is 75. The third number is 2 times the first. The second number is 9 less than the first. What are the

anygoal [31]

Let the three numbers be x, y and z. Then x+y+z=75.
z = 2x. y = x - 9.

Eliminate y and z by substitution: x + (x - 9) + (2x) = 75

Then 4x = 75 + 9, or 4x = 84. x = 21, y = 21 - 9 = 12, and z = 2(21) = 42.

Check: Do 21, 12 and 42 add up to 75?

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3 years ago

61 random samples of city rent prices are selected from a normally distributed population the samples have a mean of $738 and a

Alenkinab [10]

Answer:

(728, 748)

Step-by-step explanation:

You need the Z value which for 95% confidence interval is 1.96. The mean is $738 and the standard deviation of $41.

$X-Zs/\sqrt{n} \\ X+Zs/\sqrt{n}$

Therefore we can calculated the confidence interval

$738-1.96\cdot{41}/\sqrt{61} =738-10.3$

$738±10.3$

The interval is (728,748)

3 0

3 years ago

Jesse takes his dog and cat to the vet. Jesse's dog weights 23 pounds. the vet tell him his cat weights 5/8 as much as the dog.

Svetradugi [14.3K]

5/8 *23=115/8
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3 years ago

What is the difference between arcsin and sin^-1 ?

Len [333]

If you're using the app, try seeing this answer through your browser: brainly.com/question/2094473

_______________

Both refer to the inverse sine function.

The inverse sine (or arcsine) of x:

$\mathsf{f(x)=arcsin(x)=sin^{-1}(x)}$

where x is a real number in the domain of the function:

$\mathsf{-1\le x\le 1}$

and the arcsine function returns an angle in the interval $\mathsf{\left[-\,\frac{\pi}{2},\,\frac{\pi}{2}\right]:}$

$\mathsf{-\,\dfrac{\pi}{2}\le arcsin(x)\le \dfrac{\pi}{2}}\quad\longleftarrow\quad\textsf{range of the inverse sine function.}$

So if you see anywhere one of these expressions below

$\mathsf{\theta=arcsin(x)~~or~~\theta=sin^{-1}(x)}$

then you should look for an angle $\theta$ that satisfies the following conditions:

$\footnotesize\begin{array}{l}\bullet\end{array}\normalsize\begin{array}{l}\mathsf{sin\,\theta=x;} \end{array}\\\\\\
\footnotesize\begin{array}{l}\bullet\end{array}\normalsize\begin{array}{l}\mathsf{\dfrac{\pi}{2} \le \theta\le\dfrac{\pi}{2}.} \end{array}$

This angle $\theta$ is called the inverse sine of the real number x.

______

Pay attention and do not mistake the arcsine function for the reciprocal of sine (which is cosecant); especially if you prefer or see that notation with an superscript -1. This one can be easily mistaken for an exponent:

$\mathsf{sin^{-1}(x)=arcsin(x)\qquad\quad\checkmark}$

but the reciprocal is something like

$\mathsf{\big[sin(x)\big]^{-1}=\dfrac{1}{sin\,(x)}=csc(x)\qquad\quad(!!)}$

and this last one has a total different meaning.

I hope this helps. =)

6 0

4 years ago