Find the area or perimeter of the figure as indicated. Express the answer in terms of ? and then round to the nearest tenth.Find the area.
A. 88 + 8? ? 113.1 m2
B. 88 + 64? ? 289.1 m2
C. 112 + 8? ? 137.1 m2
D. 88 + 16? ? 138.3 m2
Answer: A
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Write the expression as the sum or difference of logarithms.log26x
A. log2 6 - log2 x B. log2 6 + log2 x C. log1 6 - log1 x D. log1 6 + log1 x
For the given parabola, use the discriminant to determine the number of x-intercepts.y = 4x2 + 8x + 4
A. no x-intercepts B. two x-intercept C. one x-intercept
Figure (a) shows a vacant lot with a 80-ft frontage in a development. To estimate its area, we introduce a coordinate system so that the x-axis coincides with the edge of the straight road forming the lower boundary of the property, as shown in Figure (b). Then, thinking of the upper boundary of the property as the graph of a continuous function f over the interval [0, 80], we see that the problem is mathematically equivalent to that of finding the area under the graph of f on [0, 80]. To estimate the area of the lot using a Riemann sum, we divide the interval [0, 80] into four equal subintervals of length 20 ft. Then, using surveyor's equipment, we measure the distance from the midpoint of each of these subintervals to the upper boundary of the property. These measurements give the
values of f(x) at x = 10, 30, 50, and 70. What is the approximate area of the lot?
?
?
?
__________ square feet
Fill in the blank(s) with the appropriate word(s).
Decide whether the statement is true or false.? ? ? = ?
A. True B. False