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3 years ago

10

Find the values of a, b, and c for which the quadratic equation ax^2 + bx + c = 0 has the solutions 8i and −8i.

1 answer:

ozzi3 years ago

4 0

Work backward: Multiply out (x-8i) and (x+8i).

The product is x^2 - [64i^2], or x^2 - [-64], or x^2 + 64

This is equivalent to 1x^2 + 0x + 64, and so a=1, b=0 and c=64.

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A researcher selects two samples of equal size and computes a mean difference of 1.0 between the two sample means. If the pooled

s344n2d4d5 [400]

Answer:

The Cohen's D is given by this formula:

$D = \frac{\bar X_A -\bar X_B}{s_p}$

Where $s_p$ represent the deviation pooled and we know from the problem that:

$s^2_p = 4$ represent the pooled variance

So then the pooled deviation would be:

$s_p = \sqrt{4}= 2$

And the difference of the two samples is $\bar X_a -\bar X_b = 1$ , and replacing we got:

$D = \frac{1}{2}= 0.5$

And since the value for D obtained is 0.5 we can consider this as a medium effect.

Step-by-step explanation:

Previous concepts

Cohen’s D is a an statistical measure in order to analyze effect size for a given condition compared to other. For example can be used if we can check if one method A has a better effect than another method B in a specific situation.

Solution to the problem

The Cohen's D is given by this formula:

$D = \frac{\bar X_A -\bar X_B}{s_p}$

Where $s_p$ represent the deviation pooled and we know from the problem that:

$s^2_p = 4$ represent the pooled variance

So then the pooled deviation would be:

$s_p = \sqrt{4}= 2$

And the difference of the two samples is $\bar X_a -\bar X_b = 1$ , and replacing we got:

$D = \frac{1}{2}= 0.5$

And since the value for D obtained is 0.5 we can consider this as a medium effect.

7 0

3 years ago

Please help ASAP 25 pts + brainliest to right/best answer

Whitepunk [10]

The answer seems to be D!!

4 0

3 years ago

Read 2 more answers

What attribute do a rectangle, parallelogram, rhombus, and square ALL have in common?

Vikki [24]

B

my answer has to be at least 20 letters.....

8 0

3 years ago

A machine in a laboratory is set to steadily increase the temperature inside. The temperature in degrees Celsius inside the mach

vaieri [72.5K]

Answer:

1) f(3) means the temperature after 3 seconds

2) f(3) = 22 + 1.3(3) = 25.9

Temperature after 3 seconds is 25.9°C

3) f(t) = 35 means after t seconds, temperature was 35°C

4) 35 = 22 + 1.3t

1.3t = 13

t = 10 seconds

6 0

3 years ago

Read 2 more answers

Two kilos of taronges and three kilos of mandarins cost 11.50 euros. Three kilos of taronges and two of mandarins cost 11 euros.

Illusion [34]

Answer:

Hence the pricing for each product will be taronges with 2 euros and mandarins with 2.5 euros.

Step-by-step explanation:

Given:

2 kg of taronges and 3 kg mandarins cost 11.5 euros

3kg taronges and 2 kg mandarins cost 11 euros

To Find:

Price for each product

Solution:

<em>Consider </em>

<em>Taronges =x euros</em>

<em>Mandarins=y euros</em>

So by given condition,

$2x+3y=11.5$ ....................equation(1)

and $3x+2y=11 ...$ ...........equation (2)

So , using substitution method,

$3x=11-2y$

$x=11-2y/3$ .......equation (3)

Using above value in equation(1) we get ,

$2(11-2y)/3+3y=11.5$

$y=(11.5*3-22)/5$ )

y=2.5 euros

Using above value in equation(3) we get ,

$x=(11-2y)/3$

$x=(11-2*2.5)/3$

$x=(11-5)/3$

x=2 euros

5 0

3 years ago