Find the determinant of the given matrix.
A. -280
B. 280
C. 217
D. -343
Answer: A
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Analyze the situation and explain how you would make a decision.Your current cell phone company charges $30 per month for unlimited minutes. Another company charges $20 per month for the first 500 minutes plus 5¢ a minute for any additional minutes. Should you keep your current service or switch to the other company?
What will be an ideal response?
Find 
and 
.f(x, y) = 
A. 
= - 
; 
= - 
B. 
= 
; 
= - 
C. 
= 
; 
= - 
D. 
= 
; 
= 
The stack plot below shows the value of each of Danny's investments. The stack plot contains three regions. The uppermost unshaded region represents the value of Danny's investment in individual stocks. The center shaded region represents the value of Danny's investment in mutual funds and the bottom region in black represents the value of Danny's investment in a CD. The thickness of a region at a particular time tells you its value at that time. 
Use the graph to answer the question.In year 0, approximately what percentage of Danny's total investment was in the CD?
A. 20% B. 30% C. 15% D. 25%
Determine the size of the matrix.
A. 3 × 3 B. 2 × 3 C. 6 × 6 D. 9