Evaluate the expression using the properties of real numbers.
+ 
A. 
B. 
C. 
D. 0
Answer: D
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Solve the problem.There are currently 78 million cars in a certain country, increasing exponentially by 1.9% annually. How many years will it take for this country to have 99 million cars? Round to the nearest year.
A. 11 yr B. 13 yr C. 160 yr D. 4 yr
Solve the problem.The width of a rectangular stamp is 1.10 cm greater than the length. If the width and length are both increased by 1.0 cm, the stamp would have a perimeter equal to 18.20 cm. What are the actual dimensions of the stamp?
A. 3.50 cm × 4.05 cm B. 3.00 cm × 4.10 cm C. 7.00 cm × 8.10 cm D. 3.00 cm × 8.20 cm
Solve the system of equations using substitution.
A. x = 
, y = 
; x = 1, y = 5
B. x = - 
, y = 2; x = 1, y = 5
C. x = 
, y = 6; x = - 
, y = -
D. x = 
, y = 
; x = - 
, y = 0
Simplify the expression.
A. 8
B. 4
C. 12
D. 4