Find the indicated partial sum for the sequence.-9, -12, -15, -18, . . .; S4
A. -54
B. -9
C. -36
D. -21
Answer: A
Mathematics
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Find the direction angle ? for the given vector. Let 0° ? ? < 360° and round ? to the nearest tenth when appropriate.
A. 270° B. 135° C. 225° D. 315°
Mathematics
Provide an appropriate response.The probability distribution for the random variable X is: 
What is the expected value of X?
A. 0.62 B. 0.26 C. 0.22 D. 0.50
Mathematics
Decide whether or not the equation defines y as a function of x.
= x2 + 4 (Hint: Let x = 0.)
A. No B. Yes
Mathematics
Find the difference.- 
- 
A. - 
B. - 
C. - 
D. 
Mathematics