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QveST [7]
2 years ago
7

Help

Mathematics
1 answer:
maria [59]2 years ago
5 0

Step-by-step explanation:

Radicals and fractional exponents are alternate ways of expressing the same thing. ... These examples help us model a relationship between radicals and rational ... Problem. Write as an expression with a rational exponent. The radical form can be ... Change the expression with the rational exponent back to radical form.  

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A person recently read that 84% of cat owners are women. How large a sample should the researcher take if she wishes to be 90% c
Lana71 [14]

Answer:

405

Step-by-step explanation:

To find sample size, use the following equation, where n = sample size, za/2 = the critical value, p = probability of success, q = probability of failure, and E = margin of error.

n=\frac{(z_{\frac{\alpha }{2} })^{2} *p*q  }{E^2}

The values that are given are p = 0.84 and E = 0.03.

You can solve for the critical value which is equal to the z-score of  (1 - confidence level)/2.  Use the calculator function of invNorm to find the z-score.  The value will given with a negative sign, but you can ignore that.

(1 - 0.9) = 0.1/2 = 0.05

invNorm(0.05, 0, 1) = 1.645

You can also solve for q which is 1 - p.  For this problem q = 1 - 0.84 = 0.16

Plug the values into the equation and solve for n.

n =\frac{(1.645)^2*0.84*0.16}{(0.03)^2}\\n= 404.0997333

Round up to the next number, giving you 405.

6 0
3 years ago
Tan^-1[cos(pi)] find the exact value without calculator
nata0808 [166]

Answer:

- \frac{\pi }{4}

Step-by-step explanation:

Evaluate cosπ then inverse tan, that is

cosπ = - 1

tan^{-1}(- 1) = - \frac{\pi }{4}

4 0
3 years ago
9. A television regularly costs $180, but it is on sale for 40% off. There is a
Alexandra [31]

Answer:

C $113.40

Step-by-step explanation:

100%-40%=60%

$180x60/100

=$10800/100

=$108

100%+5%(tax)=105%

$108x105/100

=$11340/100

=$113.40 (C)

3 0
3 years ago
Solve for h in this equation: 12=1/2h (2 1)
Murljashka [212]
Hello there.

<span>Solve for h in this equation: 12=1/2h (2 1)

h=8/7</span>
6 0
2 years ago
Show work also Plss help smsjsjs
choli [55]

Answer:

Step-by-step explanation:

A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a/b or {\displaystyle {\tfrac {a}{b}}}  

b

a

​  

, where a and b are both integers. As with other fractions, the denominator (b) cannot be zero.

8 0
2 years ago
Read 2 more answers
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