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kondaur [170]
3 years ago
15

George has a small coin collection. He has collected 16 gold coins, 28 silver coins, 32 copper coins, and4 bronze coins. At a fl

ea market, George sells 15% of his coins. Find the number of coins he sold.
Mathematics
1 answer:
erastovalidia [21]3 years ago
3 0
16 +28+32+4=80 80 total coins x.15 =12 coins sold
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5 years older...cause if David is 2 years younger than Graham & Neil is 7 years younger than Graham...7-2=5 years :)
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In which quadrant or on which axis each of the following points lie.
AlekseyPX

Answer:

(-3,5) Quad 2

(4,-1) Quad 4

(2,0) Positive X axis

(2,2) Quad 1

(-3,-6)​ Quad 3

Step-by-step explanation:

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What is the relationship between the ratios? 5/8 and 8/10 Drag and drop to complete the statement.
Lubov Fominskaja [6]

Answer:

NOT PROPORTIONAL

Step-by-step explanation:

The given two fractions are: $ \frac{5}{8} $ and $ \frac{8}{10} $.

Proportional fractions are those which have the same value when to reduced to the simplest form.

Consider two fractions $ \frac{p}{q} $ and $ \frac{x}{y} $.

We say they are proportional if $ p : q = x : y $.

Or, if $ py = qx $ then we can say the fractions are proportional.

Here the fractions are:  $ \frac{5}{8} $ and $ \frac{8}{10} $.

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RHS: 8 X 8 = 64.

Clearly they are not equal. So, we can say these two fractions are not proportional.

6 0
3 years ago
The scores on a psychology exam were normally distributed with a mean of 60 and a standard deviation of 10 . A failing grade on
tensa zangetsu [6.8K]

Answer:

The cutoff for a failing score was 40,

Approximately 2.3% of the students failed. ​

Step-by-step explanation:

Given,

Mean, \mu=60

Standard deviation, \sigma=10

Let x represents the cutoff for a failing score,

Thus, according to the question,

\frac{x-\mu}{\sigma}=-2

\frac{x-60}{10}=-2

x-60=-20

x=-20+60

x=40

Thus, the cutoff for a failing score is 40,

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Hence, Approximately 2.3 % of the students failed. ​

7 0
3 years ago
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