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3 years ago

X^2+8x+12=0. Solve using quadratic formula

1 answer:

8 0

D = b^2-4ac, thus D = 64 - 4*12 = 16

Now is x = -b +- sqrt(D) / 2a, or x = -8 +- sqrt(16)/2, giving respectively -2 and -6

So x = -2 or x = -6

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Well (1.57- 0.6 X 0.6) x 0.3 = 0.363

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3 years ago

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True or False: A square is a specific type of parallelogram?

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Select the two values of x that are roots of the given polynomial below. <br><br> x^2-3x-5

klio [65]

-b +or- root (b^2 -4ac) / 2a
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7 0

3 years ago

Suppose that in a senior college class of 500500 students, it is found that 179179 smoke, 228228 drink alcoholic beverages, 1

olga2289 [7]

Answer: a) 0.16, b) 0.058, and c) 0.856.

Step-by-step explanation:

Since we have given that

Number of students = 500

Number of students smoke = 179

Number of students drink alcohol = 228

Number of students eat between meals = 119

Number of students eat between meals and drink alcohol = 59

Number of students eat between meals and smoke = 72

Number of students engage in all three = 30

a) Probability that the student smokes but does not drink alcohol is given by

$P(S-A)=P(S)-P(S\cap A)\\\\P(S-A)=\dfrac{179}{500}-\dfrac{99}{500}\\\\P(S-A)=\dfrac{179-99}{500}\\\\P(S-A)=\dfrac{80}{500}\\\\P(S-A)=0.16$

b) eats between meals and drink alcohol but does not smoke.

$P((M\cap A)-S)=P(M\cap A)-P(M\cap S\cap A)\\\\P((M\cap A)-S)=\dfrac{59}{500}-\dfrac{30}{500}\\\\P((M\cap A)-S)=\dfrac{59-30}{500}\\\\P((M\cap A)-S)=\dfrac{29}{500}\\\\P((M\cap A)-S)=0.058$

c) neither smokes nor eats between meals.

$P(S'\cap M')=1-P(S\cup M)\\\\P(S'\cap M')=1-\dfrac{72}{500}\\\\P(S'\cap M')=\dfrac{500-72}{500}\\\\P(S'\cap M')=\dfrac{428}{500}=0.856$

Hence, a) 0.16, b) 0.058, and c) 0.856.

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3 years ago

5•7/8= multiply then reduce the answer to lowest terms

swat32

The answer is 35/8. 5*7 is 35 and 35/8 cannot be reduced more

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4 years ago

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