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Sveta_85 [38]
3 years ago
5

What is the positive solution to the equation below? 81x^2-49=0

Mathematics
2 answers:
Brilliant_brown [7]3 years ago
5 0
The answer is A. x = 7/9
Harman [31]3 years ago
3 0

Answer:

Im pretty sure it would be Letter A: x=7/9

Step-by-step explanation:

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Solve each triangle for the missing values shown. Show all work necessary. Use exact values
Gelneren [198K]

3)

Cos 60°= \frac{1}{2} = \frac{Adjacent} {Hypotenuse} = \frac{y} {10} \\\\ 2y=10 \\\\ y=5

Now, use Pythagoras theorem to find x

x^2+y^2=10^2 \\\\ \to x^2+5^2=10^2 \\\\ \to x^2+25=100 \\\\ \to x^2 = 100-25 \\\\ \to x^2= 75 \\\\ \to x= \sqrt{75} \\\\ \bf 5 \sqrt{3}

Similarly,

4)

Sin 45°= \frac{1}{\sqrt{2}} = \frac{Opposite} {Hypotenuse} =\frac{2 \sqrt{2}} {a} \\\\ a= 2 \sqrt{2} \times \sqrt{2} \\\\ a=4

Now, use Pythagoras theorem to find b

b^2+(2 \sqrt{2}) ^2=a^2 \\\\ \to b^2+8=4^2 \\\\ \to b^2=16-8  \\\\ \to b^2 = 8\\\\ \to b= \sqrt{8} \\\\ \bf b=2 \sqrt{2}

You can solve all of them in a similar way.

: )

7 0
3 years ago
Can someone explain this problem? I don't understand it...
Irina18 [472]
1) A function in when there is only one y for that x. (In other words it passes the vertical line test.)

2) Continuous means there are no breaks.

3) For x values less than -2, the graph is going up.

4) Between x values -2 and 8, the graph is going down.

5) After the x value 8, the graph starts to increase again.

6) The graph should only pass the x axis at 5, and only pass the y axis at 2.

Hope this helps.
8 0
4 years ago
Plz help me this is 7th grade math
Anna007 [38]

Answer:

second

Step-by-step explanation:

No because angles 1 and 2 are same side interior angles but are not supplementary

if the lines were parallel than the same side interior angles 1 and 2 add to 180

60 +115 = 175 so the lines are not parallel

3 0
3 years ago
In Exercise, expand the logarithmic expression.<br> ln(x + 1)2
rewona [7]

Answer:

In(x^2+2x+1)

Step-by-step explanation:

In(x+1)^2 = In(x+1)(x+1) = In(x^2+x+x+1) = In(x^2+2x+1)

4 0
4 years ago
The figure is dilated about x using a scale factor of 3/2 what is the length in inches of the short side after the dilation ? A
fgiga [73]

Answer:

i think its c but im not 100% sure sorry if im wrong

Step-by-step explanation:

7 0
3 years ago
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