Solve the problem.Area codes in the United States are three-digit numbers where the first digit is not a 0 or a 1. Assuming that the middle digit can be any number, how many codes are possible? (Some of these are not used.)
Fill in the blank(s) with the appropriate word(s).
8 ? 10 ? 10 = 800
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Find the cross product and determine whether the proportion is true or false.
= 
A. 100 ? 
; false
B. 15 = 15; true
C. 
? 140; false
D. 35 = 35; true
You want a linearization that will replace the function over an interval that includes the point x0. To make your subsequent work as simple as possible, you want to center the linearization not at x0 but at a nearby integer x = a at which the function and its derivative are easy to evaluate. What linearization do you use?f(x) = 
, x0 = 35.9
A. 
+ 
x
B. 3 + 
x
C. 3 - 
x
D. 3 + 
x
Write the expression as a single logarithm.logb y - logb s
A. logb 
B. logb y - s
C. log2b 
D. logb 
Solve the problem.In a sample of 85 widgets, 4 were defective. How many defective widgets would you expect in a sample of 425 widgets?
A. 20 widgets B. 23 widgets C. 18 widgets D. 46 widgets