Add or subtract as indicated. Write the answer in simplest form.
- 
A. 
B. 
C. 
D. 
Answer: D
You might also like to view...
Find the center of mass of a thin plate of constant density covering the given region.The region enclosed by the parabolas y = - x2 + 18 and y = x2
A. 
= 0, 
= 18
B. 
= 0, 
= 
C. 
= 0, 
= 9
D. 
= 9, 
= 0
Evaluate the integral.
A. 
tan4 3x - 
tan2 3x + 
ln 
+ C
B. - 
tan4 3x + 
tan2 3x - 
ln 
+ C
C. 
tan4 3x - 
tan2 3x - ln 
+ C
D. 
tan4 3x - 
tan2 3x - 
ln 
+ C
With computer security always a hot-button issue, demand is growing for technology that authenticates and authorizes computer users. The following table gives the authentication software sales (in billions of dollars), including projections, from 1999 through 2004.
Year, x012345Sales, y2.42.93.74.55.26.1?
(Here, 
represents 1999.)Find an equation of the least-squares line for these data. Please round the coefficients in your equation to three decimal places. Use the result to estimate the sales for 2010, assuming the projection is accurate. Round your answer to three decimal places.
?
A. 
billion
B. 
billion
C. 
billion
D. 
billion
Graph the equations of the system. Then solve the system to find the points of intersection.
What will be an ideal response?