Evaluate the expression for the values given.-4x - x2 + 3; x = -2
A. 15
B. -1
C. 7
D. -9
Answer: C
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Let f be a scalar field and F be a vector field. Indicate whether of the following is a scalar field, vector field, or meaningless.div (curl(grad f))
A. Scalar Field B. Vector field C. Meaningless
Solve the problem.The spread of a cold virus can be modeled using logistic equations. The key assumption is that at any given time, a fraction y of the population, where 0 ? y ? 1, has the virus, while the remaining fraction src="https://sciemce.com/media/4/ppg__tttt0613190828__f1q15g3.jpg" alt="" style="vertical-align: -4.0px;" /> and solve the initial value problem where the number of people who initially have the cold virus is 
does not. Furthermore, the cold virus spreads by interactions between those who have it and those who do not. The number of such interactions is proportional to y(1 - y). Therefore, the equation that describes the spread of the virus is 
where k is a positive real number. Assume 
A. y = 
B. y = 
C. y = 
D. y = 
Find the unknown length in the right triangle. If necessary, approximate the length to the nearest thousandth.
A. 6.325 ft B. 10 ft C. 20 ft D. 40 ft
Classify the triangle as acute, right, or obtuse and classify it as equilateral, isosceles, or scalene.
A. Obtuse, equilateral B. Acute, equilateral C. Acute, scalene D. Obtuse, isosceles