Solve the problem.What is the intensity in watt/m2 of a noise that's loudness is measured at 98 decibels?
A. 9.8 × 10-10 watt/m2
B. 6.31 × 10-3 watt/m2
C. 6.31 × 10-2 watt/m2
D. 1.8 × 1016 watt/m2
Answer: B
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Find the derivative of the function at the point p in the direction of a.
p = 
a = 3i - 4j
A. 
B. 84
C. 
D. 
If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the velocity vector.r(t) = (cot t)i + (csc t)j
A. v = (sec2 t)i + (tan t sec t)j B. v = (csc2 t)i + (cot t csc t)j C. v = (-sec2 t)i - (tan t sec t)j D. v = (-csc2 t)i - (cot t csc t)j
Let z vary jointly with x and y. Find the constant of variation k. Then, use 
to find z when x = 5 and y = 7.z = 69,020 when x = 58 and y = 119
A. k = 10; z = 120
B. k = 
; z = 120
C. k = 
; z = 350
D. k = 10; z = 350
Solve the problem.Parts for an automobile repair cost $527. The mechanic charges $31 per hour. If you receive an estimate for at least $713 and at most $837 for fixing the car, what is the time interval that the mechanic will be working on the job?
A. 1 ? t ? 10 B. 23 ? t ? 27 C. 6 ? t ? 10 D. 1 ? t ? 6