Solve the equation and check the solution.-3a + 3 + 4a = 7 - 21
A. a = 17
B. a = 31
C. a = -31
D. a = -17
Answer: D
Mathematics
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Convert the numeral to a numeral in base 10.315
A. 155 B. 20 C. 16 D. 80
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A. 
B. 
C. 
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Factor the trinomial.z2 - 2z - 80
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Mathematics