Solve the system of equations by elimination.6x + 3y = 512x - 6y = 38
A. (3, -10)
B. (-10, 3)
C. (10, -3)
D. (-3, 10)
Answer: C
Mathematics
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Factor the polynomial completely using the grouping method.18y2 + 81y - 45
A. 9(2y + 1)(y - 5) B. prime C. (18y - 9)(y + 5) D. 9(2y - 1)(y + 5)
Mathematics
Find the product and simplify.
? y10
A. 
B. 
C. 
D. 
Mathematics
Find the product. Write the product in rectangular form, using exact values.[4 cis 120°] [5 cis 120°]
A. -10 - 10
i
B. -10
+ 10i
C. 10 + 10
i
D. 10
- 10i
Mathematics
Solve the problem.A merchant has coffee worth $30 a pound that she wishes to mix with 40 pounds of coffee worth $90 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $30 coffee should be used?
A. 120 lb B. 240 lb C. 100 lb D. 200 lb
Mathematics