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beks73 [17]
4 years ago
10

Iris wants to buy two necklaces, one for her sister and one for herself. The necklace for her sister costs $42.00, and the neckl

ace for herself costs $28.00. The sales tax on the purchases is 8%. Find the total cost of Iris’s purchases, including sales tax. If necessary, round your answer to the nearest cent.
Mathematics
1 answer:
vodka [1.7K]4 years ago
6 0
70 plus 31. 4 = 101.4 
101.4 is your answer

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Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 75 and a standard deviation o
Shalnov [3]

Answer:

a) 0.975

b) 0.16

c) 0.475

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 75

Standard deviation = 5

We also have that since the normal distribution is symmetric, 50% of the measures are below the mean and 50% are above.

a. The relative frequency of rates less than 85 using the 68-95-99.7 rule is

85 is two standard deviations above the mean.

So all the 50% below the mean is below 85

And of the 50% above the mean, 95% is less than 85. So

0.5 + 0.95*0.5 = 0.975

b. The relative frequency of rates greater than 80 using the 68-95-99.7 rule is

80 is one standard deviations above the mean.

Of the 50% above the mean, 68% is less than 80. So 100-68 = 32% is more than 80.

0.32*0.5 = 0.16.

c. The relative frequency of rates between 65 and 75 using the 68-95-99.7 rule is

Within the mean and two standard deviations below the mean.

So 95% of 50%

0.95*0.5 = 0.475

6 0
4 years ago
What is equivalent to 5(3y)?
MAXImum [283]

Answer:

3(5y) or 1(15y)

Step-by-step explanation:

Hopefully this helps you! Have a great night/day!

4 0
2 years ago
PLEASE HELP ME ASAP ?!?!?
GaryK [48]

Answer:

m = 5 n = \frac{5\sqrt{3} }{2}

Step-by-step explanation:

5/2x2=5

5/3xsqrt3=5sqrt3/2

3 0
3 years ago
If the circumference of a circle is 18pi centimeters, what us the diameter of the circumference of the circle?
ziro4ka [17]
Hello there! 

Now, the formula to find the circumference of a circle is C = 2\pir. Now, since the circumference is 18\pi, all we have to do is to divide 18 by 2 to find the <em>radius!</em>

The radius of the circle is 9 cm, since 18/2 = 9. However, this is the radius. We need the diameter.

Multiply 9 by 2 to find the diameter. 9 · 2 = 18. So the answer is B. 18 centimeters.

Hope this helped!
4 0
4 years ago
A. Gus buys cupcakes every Saturday morning. When he walks into the bakery, he always orders by saying, "Give me $10 worth of cu
vredina [299]

The thing that can be deduced from Gus's elasticity of demand for cupcake is that the demand for cupcakes is perfectly elastic.

<h3>What is elasticity of demand?</h3>

It should be noted that elasticity of demand simply means the responsiveness to demand when there's a change in price.

Gus's elasticity of demand for cupcake is that the demand for cupcakes is perfectly elastic. This is when the percentage change in quantity demanded is infinite due to the price change.

Learn more about demand on:

brainly.com/question/1245771

#SPJ1

5 0
2 years ago
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