Solve.
+ 
= 
A. 43
B. -28
C. -43
D. 28
Answer: B
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Solve the problem.There were 883 billionaires in a certain country this year and 81 billionaires in this same country two years ago. Find the unit ratio of the number of billionaires this year to the number from two years ago. What does your result mean in this situation?
A. 
; The number of billionaires this year was 11.6 times greater than two years ago.
B. 
; The number of billionaires this year was 0.1 times greater than two years ago.
C. 
; The number of billionaires this year was 10.9 times greater than two years ago.
D. 
; The number of billionaires this year was 10.5 times greater than two years ago.
Find the sum of the convergent series 
.
?
A. 
B. ?
C. ?
D. ?
E. ?
Use a determinant and the given vertices of a triangle to find the area of the triangle. ? (-2, 5), (3, 3), (-1, 6) ?
A. 
B. 
C. 
D. 
E. 
Solve the problem.Raya has $230 in her checking account. She writes a check for $43, makes a deposit for $90, and then writes another check for $122. Find the amount left in her account.
A. -25 dollars B. 155 dollars C. 25 dollars D. -155 dollars