All categories

3 years ago

What is the value if a in the equation below 3 1/4a-12-3a-15

Mathematics

1 answer:

liq [111]3 years ago

4 0

Answer:

a = -12

(a equals negative twelve)

You might be interested in

What is 3.1 divided by 25.42

Crank

Answer:

0.12195121951

Step-by-step explanation:

3.1 / 25.42 = 0.12195121951

4 0

3 years ago

Read 2 more answers

On a winters day 9°F is the highest temperature recorded. write an inequality that represents the temperature t in degrees Fahre

Oliga [24]

This is simple the inequality is t<=9

3 0

4 years ago

Tables of Ratios: Mastery Test

zzz [600]

Answer: Distance(Miles)

140,420,560

Time(Hours)

5,10

3 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

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

$0.5 = 2.17*\frac{15}{\sqrt{n}}$

$0.5\sqrt{n} = 2.17*15$

$0.5\sqrt{n} = 32.55$

$\sqrt{n} = \frac{32.55}{0.5}$

$\sqrt{n} = 65.1$

$\sqrt{n}^{2} = (65.1)^{2}$

$n = 4238$

We need at least 4238 scores.

7 0

4 years ago

Need help please help and explain

VMariaS [17]

5,675.68 + 2,168.79
7,844.47
The answer is A) $7,844.47.

7 0

3 years ago

Read 2 more answers