Solve.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height?
A. 25.5 sec
B. 17 sec
C. 34 sec
D. 8 sec
Answer: B
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Solve the system using matrices. x + y + z = -2 x - y + 3z = -42x + y + z = 1
A. No solution B. (-3, 3, -2) C. (3, -2, -3) D. (-3, -2, 3)
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = sin-1(x2 + y2)
A. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the xy-plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
C. Domain: all points in the xy-plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the xy-plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
Determine the equation of the line described. Put answer in the slope-intercept form, if possible.Through (-4, 4), perpendicular to y = - 
x - 
A. y = 
x + 
B. y = 
x + 
C. y = 
x - 
D. y = - 
x - 
Find the actual difference.-32.05 - 155.24
A. 123.19 B. -187.29 C. 125.44 D. 187.29