Answer:
The number of 43 cent stamps Esmeralda bought is <u>19</u>.
Step-by-step explanation:
Given:
Esmeralda bought 12.22 worth of 43 cent stamps and 81 cent stamps. The number of 81 cent stamps was 14 less than the number of 43 cent stamps.
Now, to solve the equation 0.43 s + 0.81 ( s − 14 ) = 12.22 for s and to find the number of 43 cent stamps.
Let the number of 43 cent stamps be 
And, the number of 81 cent stamps be 
So, to solve equation for
<em>Adding both sides by 11.34 we get:</em>
<em>Dividing both sides by 1.24 we get:</em>
<em>The number of 43 cent stamps = 19.</em>
Therefore, the number of 43 cent stamps Esmeralda bought is 19.
Answer:
11 and 12?
Step-by-step explanation:
the square root of 129 is about 11.35
Answer: The margin of error = 3.71, confidence interval = (354.04, 361.46) and it means that mean cost is lies within the confidence interval.
Step-by-step explanation:
Since we have given that
Sample size = 400
Mean = $357.75
Standard deviation = $37.89
At 95% confidence level, z = 1.96
We first find the margin of error.
Margin of error is given by
95% confidence interval would be
Hence, the margin of error = 3.71, confidence interval = (354.04, 361.46) and it means that mean cost is lies within the confidence interval.
Answer:
7
Step-by-step explanation:
Simply plug in 5 for <em>x</em>
y = (5 + 9)/(5 - 3)
y = 14/2
y = 7
Answer:
27.74cm^2
Step-by-step explanation:
area of circle: 3 times 3 times pi = 28.26cm^2
area of square: 8 times 7 = 56cm^2
subtract area of circle from square
56-28.26=27.74cm^2
