Identify the interval where f is increasing or decreasing, as indicated. Express your answer in interval notation.f(x) = -5x2 + 4; decreasing
A. [0, ?)
B. 
C. (-?, ?)
D. 
Answer: A
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Solve the problem.Assuming all the necessary derivatives exist, show that if 
= 0 for all closed curves C to which Green's Theorem applies, then f satisfies the Laplace equation 
+ 
= 0 for all regions bounded by closed curves C to which Green's Theorem applies.
What will be an ideal response?
Solve the problem.Strontium 90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium 90 after t years is P = P0 e-0.0244t. How long will it take for 15 grams of strontium to decay to 5 grams? Round answer to 2 decimal places.
A. 45.03 years. B. 450.25 years C. 4.50 years D. 40.50 years
Find all complex-number solutions by using the quadratic formula.-4x2 = -3x + 1
A. 
B. 
C. 
D. 
Assume that the graph has Origin symmetry. Select the complete graph of the equation.
?
?
A. ?
?
B. ?
?
C. ?
?
D. ?
E. ?
