What is the discriminant of 372 - 10x = -2

Mathematics

1 answer:

Lunna [17]3 years ago

4 0

Answer:

10x

372 =-2

Step-by-step explanation:

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The money in michelle's bank account increased from $250 to $500. what was her percent of increase?

sergeinik [125]

Percentage increase = Final - Initial / Initial * 100
% increase = 500 - 250 / 250 * 100
% increase = 250 / 250 * 100 = 100

In short, Your Answer would be 100%

Hope this helps!

4 0

3 years ago

Read 2 more answers

Carl has a rock collection. Of the rocks, 3/8 are quartz and 1/3 are granite. What fraction of Carl's rocks are quartz or granit

hoa [83]

Answer:

$\frac{17}{24}$ <em>of Carl's rocks are quartz or granite</em>

Step-by-step explanation:

<u>Proportions and Fractions </u>

A proportion is expressed as a fraction a/b, where a and b are compared by division. If a=b, the proportion (or ratio) equals 1, if a<b, the ratio is less than 1, and if a>b, the ratio is greater than 1. The proportion of elements of a set to the total number of elements of the set is less than one, and the sum of all them equals 1.

We know 3/8 of Carl's rock collection are quartz and 1/3 are granite. If both subsets of rocks are mutually exclusive or disjoint (cannot happen simultaneously), then the proportion of both is the sum of the fractions.

$\displaystyle \frac{3}{8}+\frac{1}{3}=\frac{9+8}{24}=\frac{17}{24}$

4 0

3 years ago

On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true popu

igor_vitrenko [27]

Answer:

We need at least 4238 scores.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.97}{2} = 0.015$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.015 = 0.985$ , so $z = 2.17$

Now, find the margin of error M

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97 percent confidence in the results

We need at least n scores, in which N is found when $M = 0.5$ . So