Solve for the specified variable. Assume that all other variables are nonzero.L = 2?rh + 2?r2; for r
A. r = 
B. r = 
C. r = 
D. r = 
Answer: D
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Find the indicated term of the binomial expansion.(4x + 6)3; term containing x
A. 864x B. 288x C. 36x D. 432x
Write the complex number in polar form.2 + j
A. 2(cos 26.57° + j sin 26.57°)
B. (cos 26.57° + j sin 26.57°)
C. 
(cos 26.57° + j sin 26.57°)
D. 
(cos 26.57° + j sin 26.57°)
Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.125% annually. Determine the half-life of this isotope, to the nearest year.
A. 241 years B. 555 years C. 6 years D. 400 years
Combine like terms whenever possible.7x3 + 9x3 - 8x3
A. 8x9 B. 8x3 C. -504x3 D. Not possible