Simplify the expression by combining like terms.-9a + 2.1 + 2.5b + 4a - 8 - 7b + 5a
A. -5a + 9.5b - 5.9
B. -2.4b - 8
C. -10a - 4.5b - 5.9
D. -4.5b - 5.9
Answer: D
Mathematics
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Use the vertical line test to determine if the graphs are functions.
A. Yes B. No
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Solve the problem.Two airplanes leave an airport at the same time, one going northwest (N35°W) at 423 mph and the other going east at 349 mph. How far apart are the planes after 2 hours to the nearest mile?
A. 1273 mi B. 1188 mi C. 1428 mi D. 714 mi
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Find the equation of the line passing through the indicated two points. Write the equation in slope-intercept form.
and 
A. y = 2x + 1
B. y = 2x - 
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D. y = 2x
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Solve the problem.Determine whether the ordered triple (5, -4, 5) is a solution of the system of equations.2x - 3y + 3z = 244x + 4y - 3z = -83x - 3y + 2z = 23
A. No B. Yes
Mathematics