Find the midpoint of the line segment joining the points P1 and P2.P1 = (3, 4); P2 = (1, 8)
A. (2, -4)
B. (4, 12)
C. (6, 2)
D. (2, 6)
Answer: D
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The amount A, in grams, of a radioactive substance remaining after t years is given by the following table. Use an exponential model for these data to determine the half-life of the radioactive substance. That is, determine how long it takes for half of the substance to decay. Round your answer to two decimal places. t 3 4 5 6 A 157.36 154.21 151.13 148.11?
A. 25.46 years B. 34.50 years C. 34.31 years D. 25.00 years
Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = 8x + 4y + 7; R = {(x, y): 0 ? x ? 1, 1 ? y ? 3}
A. 28 B. 36 C. 26 D. 38
Graph the function. Specify the intervals over which the function is increasing and the intervals where it is decreasing.y = 
A. Decreasing -? < x < 0 and 0 < x < ?
B. Increasing -? < x < ?
C. Decreasing -? < x < 0;
Increasing 0 < x < ?
D. Increasing -? < x < 0 and 0 < x < ?
Classify the angle as acute, obtuse, right, or straight.
A. Acute B. Right C. Straight D. Obtuse