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3 years ago

What is the value of b2 - 4ac for the following equation? 5x2 + 7x = 6 9 81 169

Mathematics

2 answers:

creativ13 [48]3 years ago

7 0

The answer is 169. ;)

erastova [34]3 years ago

5 0

A=5,b=7,c=-6
${7}^{2} - 4(5)( - 6) = 169$

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A high school had 2,300 students in 2010 which increased by 33% in the following four years. How many students are there in 2014

mr Goodwill [35]

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students in 2014 = 133% × 2,300
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3 years ago

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g100num [7]

Answer: A

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According to a survey, 62% of murders committed last year were cleared by arrest or exceptional means. Fifty murde committed las

alexira [117]

Answer:

a) The probability that exactly 41 of the murders were cleared is 0.0013

b) The probability that between 36 and 38 of the murders, inclusive, were cleared is 0.0809.

c) Yes, it would be unusual

Step-by-step explanation:

Let p=62% considered as the probability of having a commited that is cleared by arres or exceptional means. We assume that choosing each of the 50 commited is independent of each choose. Then, let X be the number of cleared. In this case, X is distributed as a binomial random variable. Recall that, in this case,

$P(X=k) = \binom{50}{k} p^{k}(1-p)^{50-k}$ for $0\leq k \leq 50$ , with p=0.62

a) We have that

$P(X=40) = \binom{50}{40} p^{40}(1-p)^{50-40} =0.001273487$

b) We are asked for the following

$P(36\leq X \leq 38) = P(X=36)+P(X=37)+P(X=38) = 0.080888936
$ (The specific calculation is omitted.

c) We will check for the following probability $P(X\leq 19)$

$P(X\leq 19 ) = \sum_{k=0}^{19} P(X=k) = 0.000499222
$

Given that the probability of this event is really close to 0, it would be unusual if less than 19 murders are cleared.

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2 years ago

The ratio of the sales of black coffee to sugar coffee to milk coffee is 3:7:5. The total sales of the three coffees is 300 cups

Virty [35]

Answer = $55
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The 3 = black coffee
The 7 = sugar coffee
And the 5 = milk coffee
So then u do 5/15 simplified = 1/3
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3 years ago

Suppose that a large mixing tank initially holds 700 gallons of water in which 50 pounds of salt have been dissolved. another br

labwork [276]

$\dfrac{\mathrm dA}{\mathrm dt}=\dfrac{3\text{ gal}}{1\text{ min}}\dfrac{4\text{ lb}}{1\text{ gal}}-\dfrac{2\text{ gal}}{1\text{ min}}\dfrac{A\text{ lb}}{700+(3-2)t\text{ gal}}$
$\iff A'+\dfrac2{700+t}A=12$

$(700+t)^2A'+2(700+t)A=12(700+t)^2$
$((700+t)^2A)'=12(700+t)^2$
$(700+t)^2A=4(700+t)^3+C$
$A=4(700+t)+\dfrac C{(700+t)^2}$

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$\dfrac5{70}=2800+\dfrac C{700^2}$

Use this to solve for $C$ .

8 0

2 years ago