Compute the average of the RRAM and LRAM approximations to estimate the area between the graph of the function and the x-axis over the given interval using the indicated number of subintervals. (The function is non-negative on the given interval).f(x) = 21 - 4x ; [0, 5] ; 5 subintervals
A. 
B. 55
C. 110
D. 
Answer: B
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Find the focus and directrix of the parabola.x = 6y2
A. 
, x = - 
B. 
, x = - 
C. 
, x = 
D. 
, y = - 
Provide an appropriate response. Why are decibels used instead of bels in sound work?
What will be an ideal response?
Solve the problem.A city government study suggested the number of homeless people dropped by 405 over the last 3 years. Assuming that that decrease was the same for each of the 3 years of the study, write the yearly decrease as a quotient of integers and find the yearly decrease.
A. -405 ÷ 3 = -135; 135 fewer homeless B. 405 ? 3 = 1333; 1333 fewer homeless C. 405 ? 3 = 1370; 1370 fewer homeless D. -405 ÷ 3 = -138; 138 fewer homeless
Perform the indicated operation. Write the answer in the form a + bi.
A. -2 + 2
i
B. -10 + 10
i
C. - 
+ 
i
D. - 
+ 
i