Rationalize the denominator and simplify.
A. 
B. 9
C. 109
D. 
Answer: D
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Without using a calculator, determine the value of the trigonometric function or state that the value is undefined.sec 
A. 
B. -2
C. - 
D. - 
Solve the problem. Leave your answer in polar form.z = 10(cos 30° + i sin 30°)w = 5(cos 10° + i sin 10°)Find zw.
A. 50(cos 300° + i sin 300°) B. 50(cos 40° + i sin 40°) C. 15(cos 300° + i sin 300°) D. 15(cos 40° + i sin 40°)
Solve the system of equations by the substitution method.3x - 2y = -28 - 3x4x + 7y = x + 6y + -4
A. {(-3, -5)}
B. {(-3, 5)}
C. 
D. {(0, -28)}
Solve the problem.A person's metabolic rate tends to go up after eating a meal and then, after some time has passed, it returns to a resting metabolic rate. This phenomenon is known as the thermic effect of food, and the effect (in kJ/hr) for one individual is F(t) = -10.28 + 175.9te-t/1.3where t is the number of hours that have elapsed since eating a meal. Find the total thermic energy of a meal for the next four hours after a meal by integrating the thermic effect function between 
and 
A. 150.1 kJ B. 186.5 kJ C. 200.3 kJ D. 128.4 kJ