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Ostrovityanka [42]
3 years ago
8

Mike earned $67.00 in simple interest on an investment of $2800 after 9 months. What is the interest rate?

Mathematics
1 answer:
lawyer [7]3 years ago
5 0

Answer:

0.2659%

Step-by-step explanation:

r = (1/t)(A/P - 1)

r = (1/9)((2867/2800) - 1) = 0.00265873

r = 0.00265873

R = 0.00265873 * 100 = 0.2659%/month

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Alan, Bill, and Calvin are playing a game with collectible cards. At the moment, Alan has 11 less than 2.5 times the number of c
oksian1 [2.3K]

Answer:

50

Step-by-step explanation:

I'm sorry but your missing the questions but I found a close answer! Let A be the number of cards Alan has B be the number of cards Bill has C be the number of cards Calvin has Alan had 11 less than 2 1/2 times the number of cards bill has. is 2.5 Alan is 2.5 of bill has minus 11 A=2.5B -11 Calvin has 1 more than 1 1/2 times the number of cards bill has. is 1.5 Calvin is 1.5 of bill has plus 1 C=1.5B + 1 Alan and Calvin have the same number of cards So A=C WE plug in A  and C equations and solve for B 2.5B -11 = 1.5B + 1 (subtract 1.5B on both sides) 1B -11 = 1 (Add 11 on both sides) B = 12 If Alan and Calvin have the same number of cards, the number bill has is 12 The number of cards Alan and Calvin each have is 19 Total cards = 12 + 19 + 19 = 50 If Alan, bill, and Calvin have all the cards in the deck then the deck has 50 cards.

3 0
2 years ago
How do you solve this
Harman [31]
70+80+(m+10)= 180°
150+m+10=180
160+m=180
m=20°
8 0
2 years ago
How do you divide a fraction by a fraction?
Vaselesa [24]

Answer:

Step-by-step explanation:you flip the second fraction and multiply that

8 0
2 years ago
Can someone help me with my math work please?
MArishka [77]

I Will Number All The Answers Below, and give my best explanation :D                          

6.

Jay Has 10 Tallies, When There Is 10 Tallies, Normally It Means the number 10

Madison Only Has 3 Tallies, therefore Madison has 3

Kimberly Has 7 Tallies, Which Means Kimberly has 7

7. You See Those Squares On The Graph? You Are Going to color them out

Jay Has 10 tallies, so you will will those squares out 10 times on Jays side

Madison Has 3 Tallies, so you are going to fill 3 Boxes for maddison

Kimberly Has 7, So you are going to fill Kimberly's box 7 times

8. How Many Bottles Did Kimberly Bring? She Brung 7 Bottles

9. Maddison Brough The Least Bottles, Which is 3

Hope This Helped :D

-Deadly

4 0
2 years ago
The mean IQ score of students in a particular calculus class is 110, with a standard deviation of 5. Use the Empirical Rule to f
Anika [276]

Answer:

2.5%

Step-by-step explanation:

If the data set has a bell-shaped distribution, then you can use 68-95-99.7, or Empirical, rule. With bell-shaped distributions, 68% of results lie within 1 standard deviation of the mean, 95% of results lie within 2 standard deviations, and 99.7% lie within 3 standard deviations.

Your mean is 110, and you have a standard deviation of 5. This means that 68% of all students fall between IQ scores of 105 (110 - 5) and 115 (110 + 5), one standard deviation from the mean. To get 95% of the students, you need to go one more standard deviation out, so then you have 100 (105 - 5) and 120 (115 + 5), two standard deviations from the mean. 99.7% of the students fall between 95 (100 - 5) and 125 (120 + 5). What you want is to find the percentage of students with an IQ above 120.

The way I'd handle this is starting with what I know is absolutely, without a doubt, below 120. If you drew a quick bell curve to represent this data, everything to the left of the mean, 110, could be counted out right away (I usually color in half of the bell curve because I like the visual representation). Just like that, 50% of your data is gone. From there, I know 120 is right at 2 standard deviations away, so I color in all the way up to the 95% mark, but remember that when we took away 50%, you don't want to count all the standard deviations on the left side of the bell curve twice. So instead, take the 95% and cut it in half, which is 47.5%. Alternatively, you can start at 50% and count up 1 standard deviation (34%), and up one more (13.5%) and get the same result, 47.5%. So now you know 50 + 47.5 = 97.5% of results are LOWER than 120. To figure out what's higher than 120, all you have to do is see that

100% - 50% - 47.5% = 2.5%

And then you can see that 2.5% of students have an IQ over 120.

5 0
3 years ago
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