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3 years ago

Find the number of real number solutions for the equation. x2 – 3x + 8 = 0 1 0

Mathematics

1 answer:

irina1246 [14]3 years ago

4 0

The answer to the equation is 0

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Write -3i + (3/4+2i) - (9/3+3i) as a complex number in standard form

bogdanovich [222]

Answer:

= -3i + (3/4+2i) - (9/3+3i)

= (3/4 - 9/3) + (-3 + 2 -3)i

= -9/4 -4i

4 0

3 years ago

(Small sample confidence intervals for a population mean) suppose you are taking a sampling of 15 measurements. you find that x=

Luda [366]

Answer:

The 99% confidence interval is $71.67 < \mu < 78.33$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 15$

The sample mean is $\= x = 75$

The standard deviation is $s = 5$

Given that confidence is 99% then the level of significance is mathematically represented as

$\alpha = 100 - 99$

$\alpha = 1\%$

$\alpha = 0.01$

Next we obtain the critical values of $\frac{ \alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{ \alpha }{2} } = 2.58$

Generally the margin for error is mathematically represented as

$E = Z_{\frac{ \alpha }{2} } * \frac{ s}{ \sqrt{n} }$

=> $E = 2.58 * \frac{ 5}{ \sqrt{15} }$

=> $E = 3.3307$

The 99% confidence interval is mathematically represented as

$\= x -E < \mu < \= x +E$

=> $75 - 3.3307 < \mu$

=> $71.67 < \mu < 78.33$

3 0

3 years ago

Helpppp i literally have no idea which one it is

SVETLANKA909090 [29]

Ya what the person above me said

7 0

2 years ago

For an upcoming election, 500 registered voters were surveyed on a tax increase. 43% were for a tax increase and 51% were agains

dalvyx [7]

Against a tax increase because either way the margin of error may fall, against will still have more votes

5 0

3 years ago

A map using a scale of 1 inch:5 miles shows a section of land with an area of 3.2 inches what is the actual area of the section

Firlakuza [10]

Answer:

16 miles

Step-by-step explanation:

A scale drawing is a reduced form in terms of dimensions of an original image / building / object

the scale drawing is usually reduced at a constant dimension

scale of the drawing = original dimensions / dimensions of the scale drawing

Actual area = 3.2 x 5 = 16 miles

8 0

3 years ago