Solve the problem.How many 5-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, if repetitions are not allowed?
A. 16,807 five-digit numbers
B. 2520 five-digit numbers
C. 120 five-digit numbers
D. 119 five-digit numbers
Answer: B
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Add or subtract. Simplify the answer.
- 
A. 
B. 
C. 
D. 
Use a calculator to give the real number value. Round the answer to 7 decimal places.y = cos-1(-0.3907)
A. 2.0079383 B. -1.1698423 C. 1.9721882 D. 1.9206367
State the addition property illustrated by the given equation.0 + (-4716) = -4716
A. Associative B. Inverse C. Identity D. Commutative
Figure (a) shows a vacant lot with a 100-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, 100], we see that the problem is mathematically equivalent to that of finding the area under the graph of f on [0, 100]. To estimate the area of the lot using a Riemann sum, we divide the interval [0, 100] into five 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, 70, and 90. What is the approximate area of the lot?
?
?
?
__________ square feet
Fill in the blank(s) with the appropriate word(s).