Find a ? b.a = 15j, b = i + 3j
A. -45
B. 
C. 
D. 45
Answer: D
Mathematics
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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
Mathematics
Use the number line model to illustrate the following operation.
+ 
A. 
B. 
C. 
D.
 ? |
Mathematics
Find the GCD or LCM as indicated.Given 30 and 90, find the LCM.
A. 270 B. 180 C. 90 D. 30
Mathematics
Solve the equation.x - 17 = 4
A. -13 B. 21 C. 13 D. -21
Mathematics