Determine if the equation is an identity.sin 
= csc x
A. Yes
B. No
Answer: B
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Find the expected value of the random variable.The random variable X is the number of siblings of a student selected at random from a particular secondary school. Its probability distribution is given in the table.
A. 1.479 B. 2.5 C. 1.771 D. 1.375
Provide an appropriate response.Interest rates on mortgages may vary from bank to bank.
A. True B. False
Identify the type of sampling described by the proposal.An education researcher randomly selects 60 of the nation's junior colleges and interviews all of the professors at each school.
A. stratified sample B. cluster sample sample C. convenience sample D. simple random sample E. systematic sample
The graphs of two polynomials p and d are shown in the figure. p is represented by the solid line and d is represented by the dashed line. If f = 
, (a) find the domain of f, (b) find the x-intercepts of f, and (c) sketch the graph of f.
A. (a) (-?, 3) ? (3, 4) ? (4, ?)
(b) (0, 0)
(c)
B. (a) (-?, -3) ? (-3, 4) ? (4, ?)
(b) (0, 0)
(c)
C. (a) (-?, -3) ? (-3, 4) ? (4, ?)
(b) (0, 0)
(c)
D. (a) (-?, 3) ? (3, 4) ? (4, ?)
(b) (0, 0)
(c)