Translate the problem to a system of equations, then solve using matrices.Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 10% and the rest at 8%. He made a total of $920 in interest. How much was invested at 8%?
A. $6000
B. $8000
C. $4000
D. $5000
Answer: C
Mathematics
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 3x2, y = 3
A. 
?
B. 
?
C. 
?
D. 
?
Mathematics
Find the domain and range of the inverse of the given function.f(x) = 
A. Domain and range: all real numbers B. Domain: [7, ?); range: [7, ?) C. Domain: [0, ?); range: [7, ?) D. Domain: [7, ?); range: [0, ?)
Mathematics
Solve the radical equation. Check all proposed solutions.
= 5
A. x = 25
B. x = 5
C. x = 
D. x = 
Mathematics
Indicate whether the graph represents a one-to-one function.
A. Yes B. No
Mathematics