Use Cramer's rule to solve the system.3x = -6y - 33x = -y - 13
A. {(2, -5)}
B. {(-2, -5)}
C. {(-5, -2)}
D. {(-5, 2)}
Answer: D
Mathematics
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Solve the problem.The primary reason for having a control group and a treatment group in a clinical study is
A. to eliminate confounding variables. B. to save money. C. to combat the placebo effect. D. to make it easier to collect data. E. none of these
Mathematics
Solve the equation.-26.8 - k = 17.4
A. -9.4 B. 9.4 C. -44.2 D. 44.2
Mathematics
Find the quotient.
A. 
B. 1
C. 
D. 
Mathematics
Grant receives $270 annual income from one investment. Jeff invested $3200 more than Grant, but at an annual rate of 1% less. Jeff's annual income is $496. Find the amount and rate of Grant's investment. ?
A. $3000, 9% B. $3100, 8% C. $4600, 8% D. $4600, 9% E. none of these
Mathematics