Find the quotient.30 ÷ (-15)
A. -12
B. 2
C. -2
D. - 
Answer: C
Mathematics
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Differentiate the function.r(t) = (cot t)i + (csc t)j
A. r'(t) = (-sec2 t)i - (tan t sec t)j B. r'(t) = (-csc2 t)i - (cot t csc t)j C. r'(t) = (sec2 t)i + (tan t sec t)j D. r'(t) = (csc2 t)i + (cot t csc t)j
Mathematics
Solve the system using matrices.x - 5y = -4x + 8y = -4
A. (-4, 0) B. (4, 0) C. (0, 4) D. (0, -4)
Mathematics
Solve the equation by the method of your choice. Simplify irrational solutions, if possible.x2 + 18x + 66 = 0
A. {-18 ± 
}
B. {-9 ± 
}
C. {9 ± 
}
D. {9 ± 
}
Mathematics
Find z1z2. Write the answer in polar form with the argument between 0° and 360°.z1 = 1 - 
i, z2 =2 - 2i
A. 4(cos 345° + i sin 345°)
B. 4
(cos 345° + i sin 345°)
C. 4
(cos 255° + i sin 255°)
D. (2 + 2
)(cos 255° + i sin 255°)
Mathematics