Solve. The number of mobile phones sold in a given year is approximated by 
where x represents the number of years since 2010. The corresponding polynomial for phones is 
Find the polynomial that represents how many more mobile phones than phones were sold in a given year.
A. -3x4 + x3 + 4x2 - 11x + 11
B. -3x4 + x3 + 13x2 + 5x - 9
C. -3x4 - x3 - 4x + 10
D. 3x4 - x3 + 14x2 - 5x + 9
Answer: D
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Perform the indicated operation.-
+ 
A. 
B. - 
C. - 2
D. 2
Determine the domain and range of the relation. State whether the relation is a function or not a function. 
A. domain: {Ms. Lee, Mr. Bar} range: {Bob, Ann, Dave} function B. domain: {Bob, Ann, Dave} range: {Ms. Lee, Mr. Bar} not a function C. domain: {Ms. Lee, Mr. Bar} range: {Bob, Ann, Dave} not a function D. domain: {Bob, Ann, Dave} range: {Ms. Lee, Mr. Bar} function
Solve the investment problem.Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 8% and the rest at 6%. He made a total of $720 in interest. How much was invested at 6%?
A. $8000 B. $4000 C. $5000 D. $6000
Solve the problem.A truck rental company rents a moving truck one day by charging $25 plus $0.13 per mile. Write a linear equation that relates the cost y, in dollars, of renting the truck to the number x of miles driven. What is the cost of renting the truck if the truck is driven 110 miles?
A. y = 0.13x - 25; $10.70 B. y = 0.13x + 25; $39.30 C. y = 25x + 0.13; $2750.13 D. y = 0.13x + 25; $26.43