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Calculus
Practice Quiz 227

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Find dy/dx .

1.  y = -7x + 5
  1
-7
-1		 2.  y = x3(2x - 5)4
3x2(2x - 5)4 + 4(2x - 5)3
8x3(2x - 5) + 6x2(2x - 5)4
8x3(2x - 5)3 + 3x2(2x - 5)4  
3.  y =(4 - 3x)9
  27(4 - 3x)8
-12(4 - 3x)8
-27(4 - 3x)8		 4.  y = sin(7 - 5x)
-5cos( 7 - 5x )
5cos( 7 - 5x )
sin( 7 ) - 5sin(x)
5. y = tan 5(2x - 1)
 10sec2(2x - 1)
sec2(2x - 1)
10sec25(2x - 1)		 6.  y = x1/2      
1/2 x -1/2
1/2 x -3/2
1/2 x 3/2
7.  y = x -1\2
-1/2 x 1/2
-1/2 x -1/2
-1/2 x -3/2		 8.  y = (2x + 1) / (x - 7)
 -(2x - 14)/(x - 7)
-15/(x - 7)2
-13/(x - 7)2
9.  For y = 1 / (x + 2)  , find the equation of the line tangent @ x = 3.
y - 1/5 = -(x - 3)
y - 1/5 = -1/25(x - 3)
y - 1/5= -1/3x + 3

10. A cannonball shot vertically upward reaches a height of h = - 16t2 + 832t
feet after t seconds.  How long is the cannonball in the air?
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