The salinity S, in parts per thousand of dissolved solids, of a tank is being raised to a target value of 84 parts per thousand. The table below shows the difference ?
between the target salinity and the current salinity after t hours.
t 0 2 4 6 D 59.00 38.71 25.40 16.66?
A: Find an exponential model for the data. Be careful. The data are given in steps of 2 hours. Round your answer to two decimal places, if necessary.B: Find a formula that gives the salinity S after t hours. Round your answer to two decimal places, if necessary.C: Make a graph ofS versust over the first 10 hours. Include the horizontal line representing the target value.E: According to the model, when does salinity reach 64.00 parts per thousand? Round your answer to two decimal places.
What will be an ideal response?
?
B: 
?
C:
?
?
D: After 5.13 hours
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For the given investment, assume that there is no opportunity for reinvestment of returns. Find the monthly return, annual return, or annual percentage return as indicated.
Find the annual return.
A. $26.40 B. $72.49 C. $724.90 D. $869.88
Solve the problem.The following bar graph shows the average annual income for single mothers.
i) Determine a linear function that can be used to estimate the average yearly income for single mothers from year 0 through year 5. Let t represent the year.ii) Using the function from part i, determine the average yearly income for single mothers in year 3.iii) Assuming this trend continues, determine the average yearly income for single mothers in year 13.iv) Assuming this trend continues, in which year will the average yearly income for single mothers reach $33,000?
A.
| i) | I(t) = 775.8t + 24,269 |
iii) $34,354.40
iv) year 12
B.
| i) | I(t) = 775.8t + 24,269 |
iii) $34,354.40
iv) year 12
C.
| i) | I(t) = 770.8t + 24,269 |
iii) $34,289.40
iv) year 12
D.
| i) | I(t) = 775.8t + 24,269 |
iii) $34,354.40
iv) year 13
Provide an appropriate response.Solve, checking for extraneous roots: 
+ 
= 1
A. x = 0, x = -3
B. x = 1, x = 2
C. x = 
D. x = -
Find the vertices and graph the hyperbola.49y2 - 9x2 = 441
A. (0, -7), (0, 7)
B. (-7, 0), (7, 0)
C. (-3, 0), (3, 0)
D. (0, -3), (0, 3)