The cost of operating an electrical appliance is given by the formula c + 0.001 wtk, where c is the cost of operating the appliance, w is the number of watts, t is the number of hours, and k is the cost per kilowatt-hour. Find the cost per kilowatt-hour if it costs $0.07 to operate a 900-watt microwave for 2 h. Round your answer to two decimal places.
A) $0.07
B) $0.13
C) $0.04
D) $0.09
E) $0.84
C) $0.04
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Find the probability of the given event if a year is selected at random.Labor Day falls in October.
A. 
B. 
C. 0
D. 1
Find the base 10 logarithm of the given number.The probability of winning the state lottery is only 4/106.
A. -2 B. -5.40 C. -12.43 D. -8.97
Find dy/dx by implicit differentiation. If applicable, express the result in terms of x and y.-7x + 8y = 1
A. 
x
B. 8
C. 
D. 
Solve the problem.When determining appropriate doses of medication, it is sometimes important to estimate the body surface area (BSA) of a patient. This surface area (in m2) can be approximated using the Mosteller formula BSA = 
1/2, where h is the patient's height in centimeters and w is the weight in kilograms. Determine the BSA for a patient with height 188 cm and weight 91 kg. Round your answer to two decimal places.
A. 22.58 m2 B. 4.75 m2 C. 0.04 m2 D. 2.18 m2