Find the x-intercepts of the polynomial function. State whether the graph crosses the x-axis, or touches the x-axis and turns around, at each intercept. f(x) = x4 - 9x2
A. 0, crosses the x-axis;
3, crosses the x-axis;
-3, crosses the x-axis
B. 0, touches the x-axis and turns around;
9, touches the x-axis and turns around
C. 0, touches the x-axis and turns around;
3, crosses the x-axis;
-3, crosses the x-axis
D. 0, touches the x-axis and turns around;
9, crosses the x-axis
Answer: C
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Find the indicated probability.The table shows the distribution of family size in a certain U.S. city Family Size Probability 20.457 30.203 40.198 50.088 60.036 7+0.018A family is selected at random from the city. Find the probability that the size of the family is between 2 and 5 inclusive. Round approximations to three decimal places.
A. 0.858 B. 0.401 C. 0.545 D. 0.946
Write the contrapositive of the statement. q ? (p ? r)
A. ~(p ? r) ? ~q B. (p ? r) ? q C. ~q ? ~(p ? r) D. q ? (p ? r)
Graph the function. Describe its position relative to the graph of the indicated basic function.f(x) = e-0.8x; relative to f(x) = ex
A. Stretched vertically
B. Stretched horizontally
C. Stretched vertically;
reflected across the y-axis
D. Stretched horizontally;
reflected across the y-axis
Simplify the expression. Assume that all variables are positive when they appear.
A. 4
B. 125
C. 
D. 