Use implicit differentiation to find the specified derivative at the given point.Find 
at the point (1, -1) for -6xy2 - 4x2y - 7x = 0.
A. - 
B. - 
C. 
D. 
Answer: D
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Use the multiplication principle to solve the equation.-x = - 
A. - 
B. - 
C. 
D. 
Solve the problem.The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is 
t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
A. 10 sec B. 30 sec C. 20 sec D. 60 sec
Solve the problem.The decibel level D of a sound is related to its intensity I by 
. If Io is 10-12, then what is the intensity of a noise measured at 63 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.
A. 6.3 × 10-10 watt/m2 B. 5.45 × 1014 watt/m2 C. 2 × 10-6 watt/m2 D. 2 × 10-5 watt/m2
Use a graphing calculator to solve the system of equations. Round your solution to one decimal place.
A. (-2.2, 1.1, -6.4, 23.3) B. (2.2, 1.1, -6.4, -12.4) C. (2.2, -1.1, -6.4, 7.6) D. (2.2, 1.1, 7.2, 12.4)