Determine whether the given function satisfies a Laplace equation.f(x, y, z) = cos (-5x) sin (6y) e(
z)
A. No
B. Yes
Answer: A
Mathematics
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Determine whether or not one or more pairs of twin primes exist between the pair of numbers given. If so, identify the twin primes.81 and 100
A. 89, 91 B. 83, 85 C. 91, 93 D. No
Mathematics
The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.Find the pH value of a sample of lake for which [H+] = 0.00000000305. Round to the nearest tenth.
A. 8.5 B. 7.3 C. 6.4 D. 10.1
Mathematics
Find the perimeter or area of the figure as indicated. Express your answer in simplified radical form.Find the area of the rectangle.
A. 24
sq ft
B. 72 sq ft
C. 8
sq ft
D. 24 sq ft
Mathematics
Simplify the expression.
? 
A. 4
B. 7
C. 16
D. 2
Mathematics