Factor the difference of two squares.9x2 - 25y2
A. (3x - 5y)2
B. (3x + 5y)(3x - 5y)
C. (3x + 5y)2
D. prime
Answer: B
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Find the unit tangent vector of the given curve.r(t) = (10t cos t - 10 sin t)j + (10t sin t + 10 cos t)k
A. T = (10 cos t)j - (10 sin t)k
B. T = (-10 sin t)j + (10 cos t)k
C. T = (-sin t)j + (cos t)k
D. T = - 
(sin t)j + 
(cos t)k
For the following equation, graph y = f1(x) and y = f2(x) on the same screen on your calculator. From the graphs, make a conjecture as to whether the equation is an identity. If so, prove your conjecture.
= 
What will be an ideal response?
Verify the identity.
= 
What will be an ideal response?
Provide an appropriate response.When the numerator is the same as the denominator, for example 
, the fraction is called a(n) 
fraction.
A. whole B. proper C. uncommon D. improper