Solve.A brick wall 16 m by 34 m is 0.52 m thick. Under particular temperature conditions, the rate of heat flow through the wall, in calories per second is given by the expression 
. Calculate the value of this quantity to the nearest tenth.
A. 16.2 calories per second
B. 6.8 calories per second
C. 4.8 calories per second
D. 17.8 calories per second
Answer: D
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Given that a quantity Q(t) exhibiting exponential decay is described by the function
where t is measured in years. What is the decay constant? What quantity is present initially?Complete the table of values. Round your answer to the nearest integer.
t
0
5
10
20
100
Q
____
____
____
____
____
A. k = 2,200; Q = -2,200??
| t | 0 | 5 | 10 | 20 | 100 |
| Q | 2,200 | 1,912 | 1,530 | 1,000 | 35 |
B. k = 2,200; Q = -2,200?
| t | 0 | 5 | 10 | 20 | 100 |
| Q | 2,200 | 1,912 | 1,475 | 1,000 | 40 |
C. k = -0.04; Q = 2,200?
| t | 0 | 5 | 10 | 20 | 100 |
| Q | 2,200 | 1,801 | 1,530 | 989 | 35 |
D. k= -0.04; Q = 2,200?
| t | 0 | 5 | 10 | 20 | 100 |
| Q | 2,200 | 1,801 | 1,475 | 989 | 40 |
Graph the rational function.f(x) = 
A. 
B. 
C. 
D. 
Solve.The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the car's speed, and inversely as the radius of the curve. If a force of 
is needed to keep an 
car traveling at 20 mph from skidding on a curve of radius 
what force would be required to keep the same car from skidding on a curve of radius 
style="vertical-align: -4.0px;" /> at 
Round your answer to the nearest pound of force.
A. 29,158 pounds
B. 28,620 pounds
C. 28,588 pounds
D. 28,456 pounds
Identify the vertex and axis of symmetry of the parabola.y = 2x2 - 8x + 5
A. Vertex (-2, -3); Axis of symmetry x = -2 B. Vertex (2, 3); Axis of symmetry x = 2 C. Vertex (2, -3); Axis of symmetry x = 2 D. Vertex (-2, 3); Axis of symmetry x = -2