Determine the half-life of the substance that decays from A0 to A in time t. Round to the nearest tenth of a unit. A0 = 162, A = 60, t = 17 years
A. 2.5 yrs
B. 17.1 yrs
C. 11.9 yrs
D. 11.7 yrs
Answer: C
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Find the exact value of the indicated trigonometric function of ?.sin ? = - 
, tan ? > 0Find sec ?.
A. - 
B. - 
C. - 
D. 
Write the rational expression in lowest terms.
A. x - 2 B. x - 4 C. x + 2 D. x + 4
Provide an appropriate response.Can you find the sum of the infinite geometric series 2 + 6 + 18 + . . . ? Why or Why not?
A. Yes. This is a geometric series. B. No. This is not a geometric series. C. No. The common ratio, r, is greater than 1. D. Yes. The common ratio, r, is less than 1.
Solve the problem.Two forces, F1 of magnitude 35 newtons (N) and F2 of magnitude 55 newtons, act on an object at angles of 
and 
(respectively) with the positive x-axis. Find the direction and magnitude of the resultant force; that is, find 
Round the direction and magnitude to two decimal places.
What will be an ideal response?