Write the fraction in lowest terms.
A. 4
B. 2k2
C. 4k2
D. 2k
Answer: B
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Use inequality notation and interval notation to describe the set. ? The annual rate of inflation r is expected to be at least 4% but no more than 9%. ?
A. Inequality : 4% ? r ? 9%Interval : [4, 9] B. Inequality : 4% < r ? 9%Interval : [4, 9] C. Inequality : 4% < r < 9%Interval : [4, 9] D. Inequality : 4% ? r < 9%Interval : [4, 9] E. Inequality : 4% > r > 9%Interval : [4, 9]
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (9x + 3y)
A. Domain: all points in the xy-plane satisfying 9x + 3y > 0; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane satisfying 9x + 3y > 0; range: real numbers z ? 0; level curves: lines 
C. Domain: all points in the xy-plane satisfying 9x + 3y ? 0; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
Solve the proportion.
= 
A. -4 B. 4 C. -36 D. 36
Solve.When making a telephone call using a calling card, a call lasting 6 minutes cost $2.90. A call lasting 16 minutes cost $6.90. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that relates the cost of a making a call, y, to the time x.
A. y = 0.4x - 9.1
B. y = -0.4x + 5.3
C. y = 
x - 
D. y = 0.4x + 0.5