Simplify. Write your answers in the form of a+bi, where a and b are real numbers.(7 - 6i)(6 + 7i)
A. 84 + 13i
B. -42i2 + 13i - 42
C. 84 - 13i
D. 0 - 85i
Answer: A
Mathematics
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For the curve r(t), write the acceleration in the form aTT + aNN.r(t) = (4t sin t + 4 cos t)i + (4t cos t - 4 sin t)j + 9k
A. a = 4T + 
N
B. a = 4tN
C. a = 4T + 4tN
D. a = 
N
Mathematics
Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = - 4 and x = 4. The cross sections perpendicular to the x-axis are circular disks whose diameters run from the parabola y = x2 to the parabola y = 32 - x2.
A. 
?
B. 
?
C. 
?
D. 
?
Mathematics
Multiply.1.0(-5.68)
A. 6.78 B. 6.68 C. -4.68 D. -5.68
Mathematics
Use the LCD to clear fractions and solve the given equation.
x + 
= 
x
A. -4 B. 14 C. 4 D. -14
Mathematics