Subtract.(-2r4 + 9r3 - 3r) - (8r4 - 9r3 + 6r2 - 2r)
A. 10r4 - 18r3 + 6r2 + r
B. -10r4 + 18r3 - 6r2 - r
C. -6r4 - 6r2 + r
D. 6r4 + 6r2 - r
Answer: B
Mathematics
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i + 3tj + 
k
A. ? = 
B. ? = 
C. ? = - 
D. ? = 
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Multiply.
A. 
x4y3
B. 
x6y4
C. - 
x8y3
D. - 
x6y4
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Find an equation of the circle with the given center and radius.Center at (10, 0); radius = 7
A. (x - 10)2 + y2 = 49 B. x2 + (y - 10)2 = 7 C. (x + 10)2 + y2 = 49 D. x2 + (y + 10)2 = 7
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Solve the problem.Claire has received scores of 85, 88, 87, and 75 on her algebra tests. What score must she receive on the fifth test to have an overall test score average of at least 83?
A. 78 or greater B. 81 or greater C. 80 or greater D. 79 or greater
Mathematics