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forsale [732]
3 years ago
10

Simplify open parentheses x to the 3 eighths power close parentheses to the 3 fourths power.

Mathematics
2 answers:
seropon [69]3 years ago
5 0
X^9/32...... in other words.... x to the nine over thirty second power
ipn [44]3 years ago
4 0

Answer

(x^\frac{3}{8})^\frac{3}{4}=x^\frac{9}{32}

Step-by-step explanation:

(x^\frac{3}{8})^\frac{3}{4}

To simplify it we need to use exponential property

We multiply the inside exponent with outside exponent

(a^m)^n=a^{mn}

Inside and outside exponents are both fractions. while multiplying fractions we multiply numerator with numerator and denominator with denominator

\frac{3}{8} \cdot \frac{3}{4}=\frac{9}{32}

We cannot simplify the fraction 9/32

(x^\frac{3}{8})^\frac{3}{4}=x^\frac{9}{32}

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An SRS of 350 high school seniors gained an average of x¯=21 points in their second attempt at the SAT Mathematics exam. Assume
Lynna [10]

Answer:

a) 21-2.58\frac{52}{\sqrt{350}}=13.83  

21+2.58\frac{52}{\sqrt{350}}=28.17  

So on this case the 99% confidence interval would be given by (13.83;28.17)  

b) ME=2.58\frac{52}{\sqrt{350}}=7.17

c) ME=2.58\frac{52}{\sqrt{100}}=13.42

d) D. Decreasing the sample size increases the margin of error, provided the confidence level and population standard deviation remain the same.

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Part a

\bar X=21 represent the sample mean  

\mu population mean (variable of interest)  

\sigma=52 represent the population standard deviation  

n=350 represent the sample size  

99% confidence interval  

The confidence interval for the mean is given by the following formula:  

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}} (1)  

Since the Confidence is 0.99 or 99%, the value of \alpha=0.01 and \alpha/2 =0.005, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.005,0,1)".And we see that z_{\alpha/2}=2.58  

Now we have everything in order to replace into formula (1):  

21-2.58\frac{52}{\sqrt{350}}=13.83  

21+2.58\frac{52}{\sqrt{350}}=28.17  

So on this case the 99% confidence interval would be given by (13.83;28.17)  

Part b

The margin of error is given by:

ME=2.58\frac{52}{\sqrt{350}}=7.17

Part c

The margin of error is given by:

ME=2.58\frac{52}{\sqrt{100}}=13.42

Part d

As we can see when we reduce the sample size we increase the margin of error so the best option for this case is:

D. Decreasing the sample size increases the margin of error, provided the confidence level and population standard deviation remain the same.

6 0
2 years ago
Use the formula A = bh , where A is the area, b is the base length, and h is the height of the parallelogram, to solve this prob
ELEN [110]
A=bh
108=12(h)
h=a/b
h=108/12
h=9
5 0
3 years ago
Whats the answer to this question
Liono4ka [1.6K]

Answer:

I believe it would be B.

Step-by-step explanation:

Range: area of variation with real numbers

Also, seeing the quadrant it is in means there are negative numbers. This takes out the possibility of option A.

4 0
3 years ago
Previous
Natali5045456 [20]

Answer: y = 5d + 7 / c - 3

Step-by-step explanation:

Step 1: Add -3y to both sides

cy - 7 + -3y = 5d + 3y + -3y

= cy - 3y - 7 = 5d

Step 2: Now, add 7 on both sides

cy - 3y - 7 +7 = 5d +7

= cy - 3y = 5d +7

Step 3: Factor out y

y(c - 3) = 5d + 7

Step 4: Divide both sides by c-3

y(c - 3) / c - 3 = 5d+7 / c-3

Your answer for this should be

y = 5d + 7 / c - 3

Hope this helped!

3 0
3 years ago
A planter box can hold 3, ft of soil. The area of the base of the box is 24 ft. A sketch of the box is shown.
liraira [26]

Answer:

8

24 divided by 3= 8  

8x3=24 ft

7 0
3 years ago
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