Find the expected value of the random variable in the experiment.Three coins are tossed, and the number of tails is noted.
A. 2
B. 1.75
C. 1.5
D. 1
Answer: C
Mathematics
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Write the given expression using words.x - 7
A. Seven more than a number B. Seven less than a number C. Seven added to a number D. Seven times a number
Mathematics
Solve the problem.Bob is 72 years old and Susan is 45 years old. Write a simplified ratio in three different ways of Bob's age to Susan's age.
A. 
, 5 to 8, 5:8
B. 
, 8 to 5, 8:5
C. 
, 1 to 9, 1:9
D. 
, 72 to 45, 72:45
Mathematics
Find any values of the variable that must be excluded.
A. 4
B. 2
C. 
D. 2, -2
Mathematics
Use the given conditions to write an equation for the line in slope-intercept form.Passing through (2, 2) and perpendicular to the line whose equation is y = 3x + 6.
A. y = - 
x - 
B. y = - 
x + 
C. y = 
x - 
D. y = - 3x - 8
Mathematics