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Molodets [167]
3 years ago
6

Select all ratios equivalent to 3:5. 6 : 10 10 : 25 25 : 15

Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
8 0
6:10 because you multiply 3x2 and you get 6 and then 5x2 and you get 10
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Hi! i don’t really understand this question. if someone could help me i’d appreciate it!
Shkiper50 [21]

Answer:

Step-by-step explanation:

cute it into separate parts then add the areas together

3 0
3 years ago
The equation a = 1300(1.02)7 is being used to calculate the amount of money in a savings account. what does 1.02 represent in th
yaroslaw [1]
For this case we have an equation of the form:
 y = A * (b) ^ t
 Where,
 A: initial amount
 b: growth rate
 t: time
 The given equation is:
 a = 1300 (1.02) ^ 7
 Where,
 b = 1.02
 It represents a growth of 2% on the initial amount.
 Answer:
 
1.02 represented in this equation a growth of 2% on the initial amount.
7 0
3 years ago
What is the perimeter of a square with side length 2x-3
NeTakaya

Perimeter of a square: side length * 4, since squares have equal side lengths

Take 2x - 3 for the side length and plug it into the formula.

(2x - 3) * 4 can be rewritten as 4(2x - 3)

Distribute 4 inside the parentheses.

8x - 12 = perimeter of the square

5 0
3 years ago
Read 2 more answers
12. Using the value of 0.538 for the proportion of those surveyed who said they exercise at least 30 minutes three or more days
ICE Princess25 [194]

Answer:

ME=1.96\sqrt{\frac{0.538 (1-0.538)}{15235}}=0.00792    

The margin of error on this case is approximated \pm 0.792\% who is very clos to the +1% reported by the Gallup.

Step-by-step explanation:

Assuming this previous info : "Results are based on telephone interview conducted as part of the Gallup-Healthways Well-Being Index survey June 1–30,2013, with a random sample of 15,235 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia.

For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±1 percentage point."

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".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{p(1-p)}{n}})

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The estimated proportion on this case is \hat p =0.538 and n =15235, the margin of error is given by:

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)

And if we replace we got:

ME=1.96\sqrt{\frac{0.538 (1-0.538)}{15235}}=0.00792    

The margin of error on this case is approximated \pm 0.792\% who is very clos to the +1% reported by the Gallup.

5 0
3 years ago
2 square root of 8 multiplied by the square root of 20
Len [333]

It is 25.2982212813 hope you have a good day

7 0
3 years ago
Read 2 more answers
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