Use even and odd properties of the trigonometric functions to find the exact value of the expression.sin 
A. 
B. 
C. - 
D. - 
Answer: C
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Solve the differential equation.(9 - x2)
- xy = x, |x| < 3
A. y = 
B. y = -1 + C
C. y = -1 + 
D. y = C
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?
Find equations for the tangent plane and the normal line to the surface with equation x² + 9y² + 9z² = 22 at the point P(2, 1, 1).
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? is an acute angle and sin ? and cos ? are given. Use identities to find the indicated value.Given that sin ? = 
and cos ? = 
, find the value of csc ?.
A. 
B. 
C. 
D. 