Which of these equations is correct when x = -2?

Mathematics

1 answer:

posledela3 years ago

7 0

Answer:

C. 2x - 7 = -11

Step-by-step explanation:

When you plug in the value of x into each equation, you will find that option C is correct. 2 times -2 is -4, and -4 minus 7 is -11, which is true.

Hope this helped! :)

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How do i solve (x+3)^1/2=(3x+7)^1/4

deff fn [24]

Step 1: Cross-multiply.
(x+3)^1/2=(3x+7)^1/4
Step 2: Subtract 6x from both sides.
4x+12−6x=6x+14−6x
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Step 3: Subtract 12 from both sides.
−2x+12−12=14−12
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Step 4: Divide both sides by -2.
−2x/−2=2/−2

Answer:
x=−1

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Solve ABC with B = 122°, b = 18 feet and c = 12 feet.

romanna [79]

Answer:

C = 34 degrees, A=8.6 feet

Step-by-step explanation:

Use sine law:

$\frac{sin122}{18} = \frac{sinC}{12}$

$sin^{-1} [12(\frac{sin122}{18})]= C$

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Now that you have the C and B degrees, solve for A degrees

180 - 34 - 122 = 24 degrees for angle A

Same way as above use sine law to find the side for a now:

$\frac{18}{sin122} = \frac{A}{sin24}$

A=8.6 feet

** Thing to note is that you can rearrage the sine formula to have either the legnth or the angle on top. It's pretty straightforward, find the angles you do have and then work from there. If sine law doesnt work with your example, use cosine law. and work backwards. Wish you luck.

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Graph the line that represents the equation-- y= -2/3x+1

son4ous [18]

Answer:

The graph in the attached figure

Step-by-step explanation:

step 1

Find the intercepts

we have

$y=-\frac{2}{3}x+1$