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 = 189, A = 65, t = 18 years
A. 13.3 yrs
B. 11.7 yrs
C. 16.9 yrs
D. 2.6 yrs
Answer: B
Mathematics
You might also like to view...
Solve the problem.
= 18
A. 2.9373 B. 1.9482 C. 1 D. 2.9092
Mathematics
Factor by grouping.12x3 - 10x2y - 18xy2 + 15y3
A. (12x2 - 3y2)(x - 5y) B. (2x2 - 3y)(6x - 5y) C. (2x2 + 3y2)(6x + 5y) D. (2x2 - 3y2)(6x - 5y)
Mathematics
Encode or decode the given message, as requested, numbering the letters of the alphabet 1 through 26 in their usual order.Use the coding matrix A = 
and its inverse A-1 = 
to decode the cryptogram 
.
A. ABLE B. ARMS C. ACTS D. ALAS
Mathematics
If s denotes the length of the arc of a circle of radius r subtended by a central angle ?, find the missing quantity.r = 12.49 centimeters, ? = 5.9 radians, s = ?
A. 72.7 cm B. 74.7 cm C. 73.7 cm D. 75.7 cm
Mathematics