Solve.The intensity of a certain noise is 7.66 × 10-10 W/cm2. How loud, in decibels, is this sound level? Use the formula D = 10 log (I/I0), where I0 = 10-16 W/cm2. (Round to the nearest decibel.)
A. 80 decibels
B. -3 decibels
C. 95 decibels
D. 69 decibels
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
B. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at 
C. Domain: all points in the xy-plane satisfying x2 + y2 ? 100; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
D. Domain: all points in the xy-plane satisfying x2 + y2 = 100; range: real numbers 0 ? z ? 10; level curves: circles with centers at (0, 0) and radii r, 0 < r ? 10
Solve the problem.On Monday, an investor bought 100 shares of stock. On Tuesday, the value of the shares went up 9%. How much did the investor pay for the 100 shares if he sold them Wednesday morning for $1417?
A. $1300 B. $1545 C. $1367 D. $1350
Solve the quadratic equation by factoring.x2 - 81 = 80x
A. {-1, 81} B. {1, -81} C. {-9, -9} D. {-9, 9}
Provide an appropriate response.Solve the inequality: 3(x + 11) < 8x + 3
A. x > -6 B. x > 6 C. x < -6 D. x < 6