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2 years ago

(2x^2)+7x+5=0, I do not understand the -5/2 part why is it negative please elaborate

Mathematics

1 answer:

mamaluj [8]2 years ago

5 0

Answer:

It is one of the answers of the quadratic expression.

Step-by-step explanation:

There are two answers (because it has exponents, you can have two answers)

-1, -2.5 or -5/2

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netineya [11]

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Answer:

Step-by-step explanation:

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3 years ago

Suppose 40% of the students in a university are baseball players. If a sample of 781 students is selected, what is the probabili

3241004551 [841]

Answer:

$P(p>0.43) = 0.0436$

Step-by-step explanation:

Given

$p = 40\%$ -- proportion of baseball players

$n = 781$ --- selected sample

Required

Determine P(p>43%)

First, calculate the z score using:

$Z = \frac{\^{p}-p}{\sqrt{\frac{p(1-p)}{n}}}$

This gives:

$Z = \frac{48\%-40\%}{\sqrt{\frac{40\% *(1 - 40\%)}{781}}}$

Convert % to decimal

$Z = \frac{0.43-0.40}{\sqrt{\frac{0.40 *(1 - 0.40)}{781}}}$

$Z = \frac{0.43-0.40}{\sqrt{\frac{0.40 *0.60}{781}}}$

$Z = \frac{0.43-0.40}{\sqrt{\frac{0.24}{781}}}$

$Z = \frac{0.03}{\sqrt{0.00030729833}}$

$Z = \frac{0.03}{0.01752992669}$

$Z = 1.71$

So:

$P(p>0.43) = P(Z>1.71)$

$P(p>0.43) = 1 - P(Z$

$P(p>0.43) = 1 - 0.9564$

$P(p>0.43) = 0.0436$

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3 years ago

The ratio of 16 to 0.4 is equal to the ratio of 14 to y. What is the value of y? please help me

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Answer:

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Step-by-step explanation:

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3 years ago

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Step-by-step explanation: That's what I got and I'm 100% sure that's the answer

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