Solve the problem.The life expectancy of inhabitants of a country can be approximated by the equation y = 0.267x - 455, where x is a year between 1940 and 2006 and y is age in years. Use this mathematical model to approximate life expectancy (to the nearest tenth of a year) in 1999.
A. 488.2 yr
B. 78.7 yr
C. 529.2 yr
D. 233.7 yr
Answer: B
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What are the values of x and y to satisfy the following equations?
x + y = 4; 3x - 2y = 7 a. x = 1 y = 3 b. x = -1 y = -3 c. x = -3 y = 1 d. x = 3 y = -1 e. x = 3 y = 1
Subtract.-37 - (-68)
A. 105 B. 31 C. -105 D. -31
Solve.The pitch of a screw is the distance between threads. With each complete rotation of the screw, it goes in or out a distance equal to its pitch. How far will a screw with a pitch of 
in. go into a piece of wood when it is turned 10 complete rotations clockwise?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Solve.A woman borrowed $20,000 at 8% interest compounded annually. If the loan was paid off in one lump sum at the end of 5 years, how much did she pay?
A. $28,000.00 B. $29,386.56 C. $21,600.00 D. $9386.56