Find the mean.The grocery expenses for six families were 
, 
, 
, 
, 
, and 
. What is the mean grocery bill? Round your answer to the
nearest cent.
A. $79.79
B. $66.49
C. $99.74
D. $67.79
Answer: B
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Solve the problem.Use the formula d = 10 log (I/I0), where the loudness of a sound in decibels is determined by I, the number of watt/m2 produced by the soundwave, and 
watt/m2. What is the intensity in watt/m2 of a noise measured at 84 decibels? Round to the nearest tenth.
A. 2.5 × 10-3 watt/m2 B. 2.5 × 10-4 watt/m2 C. 8.4 × 10-10 watt/m2 D. 4.4 × 1015 watt/m2
Use the addition property of equality to solve the equation.x + 19 = 16
A. 35 B. 3 C. -3 D. -35
Give the coordinates for the vertex for the parabola.x = y2 + 4y + 10
A. (0, 2) B. (6, -2) C. (10, 0) D. (-2, 6)
The rate of change in sales S (in thousands of units) of a new product is proportional to the difference between L and S at any time t (in years), where ?L is the maximum number of units of the new product available. When 
, 
. Write and solve the differential equation for this sales model.
?
A. ?
B. ?
C. 
D. ?
E. 