Find the unit tangent vector of the given curve.r(t) = (4 - 2t)i + (2t - 9)j + (10 + t)k
A. T(t) = 
i - 
j - 
k
B. T(t) = - 
i + 
j + 
k
C. T(t) = 
i - 
j - 
k
D. T(t) = - 
i + 
j + 
k
Answer: B
Mathematics
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Without using a calculator, give the exact trigonometric function value with rational denominator.sin 30°
A. 
B. 
C. 
D. 
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Find the second derivative of the function.y = 
A. 
= 
+ 
B. 
= - 
- 
C. 
= - 
- 
D. 
= 
+ 
Mathematics
Solve the system of equations by the substitution method.
A. 
B. {(1, -4)}
C. 
D. ?
Mathematics
Write the sentence as an equation or inequality. Use x to represent any unknown number.One increased by two equals the quotient of twelve and four.
A. 1 + 2 = 12 ? 4 B. 1 + 2 = 4 ÷ 12 C. 1 + 2 = 12 - 4 D. 1 + 2 = 12 ÷ 4
Mathematics