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2 years ago

uanita’s lunch cost $13 plus a 15% tip. What was the total price of her lunch? A. $13.15 B. $14.50 C. $14.95 D. $19.50

Mathematics

2 answers:

masya89 [10]2 years ago

7 0

Answer:

C. $14.95

Step-by-step explanation:

Do $13 times 15 divided by 100 and add that to $13.

Ratling [72]2 years ago

3 0

Answer:

C. $14.95

Step-by-step explanation:

You can find 10% of your bill by moving the decimal one place to the left. If 26.50 is 100% then 10% is 2.65. Since 20% is 2 times 10%, 20% of the bill is 2.65 + 2.65 = 5.30. Now you know the tip you could leave ranging from poor to good, $2.65 to $5.30. To find 15%, halfway in between, we know 15% is 10% plus 1/2 of 10% (5%). 2.65 plus about 1.30 is 3.95.

Now you have

10% is 2.65 - by moving decimal 1 place left

15% is 3.95 - 10% + 1/2 of 10%

20% is 5.30 - 10% * 2

Hope this helps!

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You measure 25 turtles' weights, and find they have a mean weight of 31 ounces. Assume the population standard deviation is 12.8

Firlakuza [10]

Answer:

Margin of error = 4.21 ounces

Step-by-step explanation:

According to the Question,

Given That, You measure 25 turtles' weights, and find they have a mean weight of 31 ounces. Assume the population standard deviation is 12.8 ounces

Therefore, Sample mean = 31 ounces , Sample size(n) = 25 , Alpha(α) = 0.10 & Population standard deviation(σ) = 12.8 ounces

Thus, Margin of error = $Z_{critical}$ × σ / √n ( $Z_{critical}$ at α=.010 is 1.645)

Putting The Values, We get

1.645 × (12.8 / √25 ) ⇒ 4.2112 ≈ 4.21

Thus, the maximum margin of error associated with a 90% confidence interval for the true population mean turtle weight is 4.21 ounces

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Dmitriy789 [7]

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In a bag of marbles you have 3 green, 2 yellow, 6 blue, and 9 red marbles. What is the probability of picking a yellow marble fr

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Step-by-step explanation:

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Read 2 more answers

Whats the Answer y=10 4x-5y=3

nikdorinn [45]

4x-5y=3
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4x-50=3
+50 +50
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/4 /4

x=53/4

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