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2 years ago

6

A quadratic equation has a discriminant of 12. which could be the equation?

2 answers:

Julli [10]2 years ago

7 0

If you would like to find the equation, you can do this using the following steps:

D = b^2 - 4 * a * c
D = 12

0 = -x^2 + 8x + 2
D = 8^2 - 4 * (-1) * 2 = 64 + 8 = 72

0 = 2x^2 + 6x + 3
D = 6^2 - 4 * 2 * 3 = 36 - 24 = 12

0 = -x^2 + 4x + 1
D = 4^2 - 4 * (-1) * 1 = 16 + 4 = 20

0 = 4x^2 + 2x + 1
D = 2^2 - 4 * 4 * 1 = 4 - 16 = - 12

The correct result would be <span>0 = 2x^2 + 6x + 3.</span>

nadezda [96]2 years ago

6 0

Answer:

b or option 2

Step-by-step explanation:

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If a piece of rope cost 20 cents per 2 feet, how many feet can you buy for 30 dollars?

katrin2010 [14]

Answer: $300\ feet$

Step-by-step explanation:

Let be "x" the lenght in feet of rope that you can buy with 30 dollars.

According to the information provided in the exercise, you can buy a piece of rope of 2 feet with 20 cents.

Remember that $20\ cents=0.2\ dollars$

Knowing this, you can write the following proportion:

$\frac{0.2}{2}=\frac{30}{x}$

FInally, solving for "x", you get this result:

$\frac{0.2}{2}=\frac{30}{x}\\\\x(\frac{0.2}{2})=30\\\\x=(30)(\frac{2}{0.20})\\\\x=300$

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2 years ago

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Answer:

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Step-by-step explanation:

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1 year ago

If line b is perpendicular to line a, and line c is perpendicular to line a, what is the slope of line c?

slega [8]

we know that

If line b is perpendicular to line a, and line c is perpendicular to line a,

then

line b and line c are parallel

and two lines parallel have the same slope

so

<u>Find the slope of the line b</u>

Let

$A(-3,-2)\\B(2,3)$

The formula to calculate the slope between two points is equal to

$m=\frac{(y2-y1)}{(x2-x1)}$

$(x1,y1)=(-3,-2)\\(x2,y2)=(2,3)$

substitute

$m=\frac{(3+2)}{(2+3)}$

$m=\frac{(5)}{(5)}$

$m=1$

therefore

<u>the answer is</u>

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$mc=1$

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2 years ago

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Mrs.Schroeder, a school principal ,drove her own car for a class trip ,taking a different route . The principal's car can travel

dsp73

Answer:

the principal drove 384 miles

Step-by-step explanation:

12x32=384 miles

3 0

2 years ago

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