Solve the formula for the specified variable.I = 
for n
A. n = 
B. n = IR(Ir - E)
C. n = 
D. n = 
Answer: A
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (4 cos t)i + (8 sin t)j
A. a = (-4 cos t)i + (-8 sin t)j B. a = (4 sin t)i + (8 cos t)j C. a = (4 cos t)i + (8 sin t)j D. a = (-4 sin t)i + (-8 cos t)j
Solve the equation.
+ 
= 4
A. {0}
B. {
, -2}
C. {-2}
D. {2, -2}
Solve.A lamp shade has the geometric form as shown. The total surface area of a lamp shade with a slant height s and top and bottom base radii of r2 and r1 is given by 
Find an equivalent expression for the total surface area by factoring out a common factor. 
A. ?(r12 + r22 + sr1 + sr2)
B. ?(r1 + r2)(r1 + r2 + sr1r2)
C. ?r1(r1 + 
+ sr1 + sr2)
D. ?(r1 + r2)(r1 + r2 + s)
Solve the problem.Researchers have found that the maximum number of successful trials that a laboratory rat can complete in a week is given by P(t) = 52(1 - e-0.4t),where t is the number of weeks the rat has been trained. What is the maximum number of successful trials that a laboratory rat can complete in a week after being trained for 6 weeks.
A. 47 B. 11 C. 17 D. 57