Write the expression in the standard form a + bi.
A. i
B. 1
C. -1
D. -i
Answer: D
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Add.-3.7 + (-19.2)
A. -15.5 B. -22.9 C. 15.5 D. 22.9
Fill in the missing vertices to give the type of polygon required, choosing vertices from those labeled on the figure. There may be more than one way to answer. If possible, use a ruler and protractor to measure lengths and angles.
(i) Rhombus I 
(ii) Rectangle J 
-10.0px;" /> 
(iii) Isosceles trapezoid O 
A. (i) IKOP
(ii) JKLO
(iii) OLJP
B. (i) IKMO
(ii) JLNP
(iii) OPLN
C. (i) IKLP
(ii) JKLO
(iii) OMLP
D. (i) IOLJ
(ii) JLNP
(iii) OIJL
Solve the problem.Suppose that the change in pressure of the oil in a reservoir can be approximated by: P(x) = x3 - 30x2 + 225x where x is time in years from the date of the first reading. This function is valid for 
By sketching a graph of P(x), estimate when the change in pressure is maximum.
A. In year 7 B. In year 5 C. In year 6 D. In year 4
Determine the maximum number of turning points of f.f(x) = -x2(x + 6)3(x2 - 1)
A. 5 B. 6 C. 7 D. 2