Find an equation for the ellipse described. Graph the equation.Foci at (-6, -3) and (0, -3); length of major axis is 10
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
Mathematics
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Factor by grouping.15a3 + 6a2b - 20ab2 - 8b3
A. (15a2 - 4b2)(a + 2b) B. (3a2 + 4b2)(5a - 2b) C. (3a2 - 4b2)(5a + 2b) D. (3a2 - 4b)(5a + 2b)
Mathematics
Find the unit tangent vector T and the principal unit normal vector N. r(t) = (4 + t)i + (4 + ln(sec t))j - 9k, -?/2 < t < ?/2
A. T = (cos t)i + (sin t)j; N = (- sin t)i + (cos t)j B. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j C. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j D. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j
Mathematics
Rewrite the fraction with the denominator indicated.Write 
with a denominator of 88.
A. 
B. 
C. 
D. 
Mathematics
Indicate whether the quotient is 0 or undefined.
A. undefined B. 0
Mathematics