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asambeis [7]
3 years ago
9

Sari sold 300 boxes of greeting cards in November. In december she sold 500. What was the percentage increase in her sales

Mathematics
1 answer:
grigory [225]3 years ago
3 0
There was a 66 \frac{2}{3}% increase from Sari's sales from November to December. 

To find the percentage increase in her sales, we must first find the amount her sales increased. We can do that by subtracting the greeting cards sold in November from the number of greeting cards sold in December. Substituting values and simplifying, we get that she sold 200 more greeting cards in December.

To find what percent increase this is, we must find what percent 200 is of the number of greeting cards sold in November. We can do this by dividing 200 by the number of cards sold in November (300), and then multiplying by 100 (to make it a percent). Doing this, we get \frac{2}{3} * 100 which gives us our answer of 66 \frac{2}{3}%.
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Answer:

9 - 5x = 7

Step-by-step explanation:

Nine (9) less (-) then the product (*) of 5*x, equals (=) to 7

9 - 5x = 7

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Solve the equation<br> -14+2b+= -2b+2​
disa [49]

Answer:

b=4

Step-by-step explanation:

-14+2b= -2b+2​

Add 2b to each side

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3 years ago
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Suppose a large shipment of compact discs contained 19% defectives. If a sample of size 343 is selected, what is the probability
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Answer:

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Step-by-step explanation:

From the question we are told that

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      \mu_{x} = p = 0.19

 Generally the standard deviation is mathematically represented as

      \sigma   =\sqrt{\frac{p(1- p)}{n} }

=>   \sigma   =\sqrt{\frac{0.19 (1- 0.19 )}{343 } }  

=>   \sigma   = 0.0212

Generally the the probability that the sample proportion will differ from the population proportion by less than 4% is mathematically represented as

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=>  P( | \^p - p | <  0.04) = P( Z <  1.887   )- P( Z <  -1.887   )

From the z table  the area under the normal curve to the left corresponding to  1.887  and  - 1.887  is

      P( Z <  1.887   )= 0.97042

and  

     P( Z <  -1.887   )= 0.02958

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3 0
3 years ago
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vesna_86 [32]

Answer:

Answer:

(

2

,

−

1

)

Explanation:

The quickest way is to use elimination

3

x

+

4

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=

2

                 

+

2

x

−

4

y

=

8

−

−

−

−

−

5

x

     

=

10

⇒

   

x

=

2

Now substitute into one of the original eqns.

3

×

2

+

4

y

=

2

6

+

4

y

=

2

4

y

=

−

4

⇒

y

=

−

1

check in other eqn.

2

x

−

4

y

=

8

2

×

2

−

(

4

×

−

1

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=

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−

−

4

=

4

+

4

=

8

√

solns  

(

2

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−

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Step-by-step explanation:

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