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TiliK225 [7]
3 years ago
6

Which statements are true?

Mathematics
1 answer:
Montano1993 [528]3 years ago
6 0
Three of those statements are true. 
The only one that is NOT correct is:
<span>Any quadrilateral with one right angle is a rectangle.


</span>
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Which equation has the components of 0 = x2 – 9x – 20 inserted into the quadratic formula correctly? x = StartFraction negative
AnnZ [28]

Answer:

x=\frac{9+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}

Step-by-step explanation:

Recall that the quadratic formula gives you the pattern to follow in order to find the solutions to a quadratic equation of the form: ax^2+bx+c=0

It tells us that we need to use the parameters a,\, b, and c in the following formula in order to get the answers for the x-values that solve it:

x=\frac{-b+/-\sqrt{b^2-4\,a\,c} }{2\,a}

so, in our case, a=1, b=-9, and c=-20

then, replacing these values in the formula, we obtain:

x=\frac{-b+/-\sqrt{b^2-4\,a\,c} }{2\,a}\\x=\frac{-(-9)+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}\\x=\frac{9+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}

Which looks like the third expression you are listing (although it is a little hard to read)

7 0
3 years ago
Read 2 more answers
You have five gears meshed to each other running in a line. the first gear z=100, second gear z=50, third gear z=200, fourth gea
Julli [10]

Answer:

50 rpm clockwise

Step-by-step explanation:

100/50 × 50/200 × 200/150 × 150/200 = 0.5

In an odd number of gears, the first and last rotate inthe same direction.

100 rpm × 0.5 = 50 rpm

Answer: 50 rpm clockwise

6 0
2 years ago
Please help me&lt;3 &lt;3 &lt;3 &lt;3 &lt;3
Arturiano [62]

Answer: (B) SinA = 4/5

Step-by-step explanation: Sine= O/H or opposite of hypotenuse so in regards to the triangle opposite is 28 and hypotenuse 35 or 28/35 which also equals 4/5

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3 years ago
Tom has a piece of wood that is 10 and 1/3 inches long. He divides the wood into pieces that are 2 and 1/5 inches long. How many
faust18 [17]
I am sorry I needed points
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3 years ago
Out of 400 students, 35% say apples are their favorite fruit. How many students say apples are NOT their favorite fruit?
pochemuha

Answer: its 140

Step-by-step explanation:

3 0
3 years ago
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