Answer the following statement(s) true (T) or false (F)
Most existing research journals in mathematics education were established more than a century ago.
Ans: False
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A PDF for a continuous random variable X is given. Use the PDF to find E(X).f(x) = 
A. 
B. 1
C. 
D. 
Write the statement in symbolic form.Let p: The outside humidity is low. q: The central humidifier is running. r: The air in the house is getting dry.If the outside humidity is low or the central humidifier is not running, then the air in the house is getting dry.
A. (p ? q) ? r B. (p ? ~ q) ? r C. (p ? ~ q) ? r D. (~p ? ~ q) ? r
Find the LCD. Do not combine fractions.
, 
A. (x + 4)(x + 1) B. (x - 3)(x - 4)(x + 1) C. (x + 3)(x + 4)(x + 1) D. (x + 3)(x + 4)
Solve.A swimmer swims the 200m backstroke in 2.22839 minutes. Round her time to the nearest hundredth.
A. 2.23 minutes B. 2.22 minutes C. 2.24 minutes D. 2.228 minutes