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bagirrra123 [75]
4 years ago
8

Using the discriminant, the following quadratic equation y=-3x^2+7x+6 has ___ solutions

Mathematics
1 answer:
lutik1710 [3]4 years ago
6 0

Answer:

choice C. 0 no real solution

Step-by-step explanation:

y=-3x^2+7x+6

using the formula for discriminant

D =  b^2 - 4ac

D = 7^2  -  4*3*6

D = 49  - 72  < 0

no real solutions

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There are 30 balls numbered 1-30 in a bag. One is randomly selected 12 times. What is the probability of getting a prime number
Sliva [168]

Answer: The probability of getting a prime number exactly five times = 0.1908

Step-by-step explanation:

Prime numbers from 1 to 30 are 2,3,5,7,11, 13, 17, 19, 23, 29.

The probability of getting a prime number p= \dfrac{10}{30}=\dfrac13

Number of trials n = 12

Binomial probability formula:

P(X=x) = \ ^nC_x p^x(1-p)^{n-x}

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P(X=5)=\ ^{12}C_5(\frac13)^5(1-\frac13)^{7}

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Here, the image is UNATTACHED. Attaching image here for the reference.

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