Determine whether the function is a probability density function over the given interval.f(x) = 
x, 1 ? x ? 3
A. No
B. Yes
Answer: A
Mathematics
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Find the total area of the region between the curve and the x-axis.y = 
; 1 ? x ? 3
A. 
B. 
C. 3
D. 
Mathematics
Graph the parabola and give its vertex, axis, x-intercepts, and y-intercepts.f(x) = -9x2 - 2x - 2
A. vertex 
; axis is x = 
;
no x-intercepts; y-intercept is -2
B. vertex 
; axis is x = 
;
no x-intercepts; y-intercept is 2
C. vertex 
; axis is x = - 
;
no x-intercepts; y-intercept is -2
D. vertex 
; axis is x = - 
;
no x-intercepts; y-intercept is 2
Mathematics
Subtract and write the result in lowest terms.
- 
A. 0
B. 
C. 11
D. 
Mathematics
Find the simple interest. Round to the nearest cent.A company borrows $68,000 for 8 years at a simple interest of 4.5% to buy trucks.
A. $70,448.00 B. $24,480.00 C. $244,800.00 D. $92,480.00
Mathematics