Multiply.(ab - 0.8)(0.9ab + 0.9)
A. 0.9a2b2 + 0.18ab - 0.72
B. 0.9a2b2 - 0.72
C. a2b2 + 0.18ab - 0.72
D. 0.9ab2 + 0.18ab - 0.72
Answer: A
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Write a polynomial in two variables that describes the total area of the shaded region. Express the polynomial as the sum or difference of terms.xy 8
A. x2y2 + 64 B. x2y2 - 16xy + 64 C. x2y2 - 64 D. x2y2 - 16xy - 64
Graph the function.f(x) = ln x 
A. 
B. 
C. 
D. 
A tank initially contains 100 lb of salt dissolved in 200 gal of water. Saltwater containing 4 lb of salt per gal enters the tank at the rate of 5 gal per min. The mixture (kept uniform by stirring) is removed at the same rate. How many pounds of salt are in the tank after an hour?
What will be an ideal response?
State the phrase as a mathematical expression. Use x to represent the variable.Two times a number
A. 2 + x
B. 
C. 2 - x
D. 2x