Use the associative property of addition to write an equivalent algebraic expression.2 + (4 + x)
A. 2(4 + x)
B. (2 + 4)x
C. 4(2 + x)
D. (2 + 4) + x
Answer: D
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A V-slot forms a triangle whose angle at the vertex is 60°. The depth of the slot is 24 mm. Find the width of the V-slot. 
A. 12 mm B. 24 mm C. 13.9 mm D. 27.7 mm
Use a calculator to find the value of y in degrees rounded to two decimal places.y = cos-1 (-0.4541)
A. 117.01° B. -27.01° C. 24.42° D. 27.01°
Solve the problem.Several years ago, a large city undertook a major effort to encourage carpooling in order to reduce traffic congestion. The accompanying table shows the number of carpoolers, in thousands, from 2007 to 2012. Use regression to obtain a function src="https://sciemce.com/media/4/ppg__ttt0508191218__f1q117g4.jpg" style="vertical-align: -15.0px;" />
A. f(x) = 4.29 + 5.14 ln x
B. f(x) = 4.22 + 5.25 ln x
C. f(x) = 4.40 + 5.32 ln x
D. f(x) = 4.33 + 5.17 ln x
that models the data, where 
corresponds to 2007, 
to 2008, and so on. Round the constants a and b to the nearest hundredth.
Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for an to find a20, the 20th term of the sequence.-3, 3, 9, 15, 21, . . .
A. an = 6n - 9; a20 = 111 B. an = 9n - 6; a20 = 174 C. an = 6n - 3; a20 = 117 D. an = 9n - 3; a20 = 177