Find the determinant.det 
A. -98
B. -105
C. 98
D. 91
Answer: A
Mathematics
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Doris invested some money at 7% and some money at 8%. She invested $4,000 more at 8% than she did at 7%. Her total yearly interest from the two investments was $470. How much did Doris invest at each rate?
A. $100 at 7%, $4,900 at 8% B. $2,000 at 7%, $5,000 at 8% C. $1,000 at 7%, $6,000 at 8% D. $1,000 at 7%, $5,000 at 8% E. $1,500 at 7%, $4,500 at 8%
Mathematics
Evaluate the integral.
A. - 
cos 9x - 5x sin 9x + C
B. - 
cos 9x - 
x sin 9x + C
C. - 
cos 9x - 
x sin 5x + C
D. - 
cos 9x - 
sin 9x + C
Mathematics
Write the expression as one logarithm.log7 13 + log7 6
A. log7 78 B. log14 78 C. log7 19 D. log14 19
Mathematics
Solve the system of equations by the substitution method.
A. {(1, 12)}
B. 
C. 
D. ?
Mathematics