Use the formula Z = 
from statistics (a formula used to determine the relative value of one observation to another) to evaluate the expression for the given values. Write the exact value and then write your answer rounded to two decimal places.X = 140, ? = 150, ? = 18, n = 21
A. 
, 73.83
B. 
, -0.12
C. 
, 3.52
D. 
, -2.55
Answer: D
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Solve the inequality. Graph the solution set and write the solution set in set-builder notation.x2 - 3x - 10 < 0
A. {x|x < -2 or x > 5}
B. {x|x < -2}
C. {x|x > 5}
D. {x|-2 < x < 5}
Solve.The population of a suburb of Phoenix was 34.6 thousand in 2001. In addition, the population has been growing at a rate of 1.1% annually. Assuming that this growth rate continued, the model 
represents the population (in thousands of people) in the year t.(a) According to the model what will be the population of this suburb in 2010?(b) According to the model, in what year will the population of the suburb be 50 thousand?
A. (a) 37.8 thousand (b) 2002 B. (a) 38.6 thousand (b) 2034 C. (a) 38.2 thousand (b) 2251 D. (a) 38.2 thousand (b) 2035
Find an equation y = mx + b that models the quantity y after x units of time.A quantity y is initially 20 and increases at a rate of 3 per minute.
A. y = 3x + 20 B. y = 20x + 3 C. y = 20x - 3 D. y = -3x + 20
The graph below is one complete cycle of the graph of an equation containing a trigonometric function. Find an equation to match the graph. If you are using a graphing calculator, graph your equation to verify that it is correct.
?
?
?
A. 
B. ?
C. ?
D. ?
E. ?