Find the unit tangent vector T and the principal unit normal vector N. r(t) = (4t sin t + 4cos t)i + (4t cos t - 4 sin t)j - 5k
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 = (-sin t)i - (cos t)j
Answer: D
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Estimate the value as a whole number or as a mixed numeral where the fractional part is 
.3
A. 3
B. 4
C. 3
D. 4
Solve the equation for y.4x + 7y = 8x + 9
A. y = 
x - 
B. y = 
x + 
C. y = 4x + 12
D. y = 
x + 
Provide an appropriate response.Perform the operation and simplify your answer: 
+ 
Fill in the blank(s) with the appropriate word(s).
Solve. Round to the nearest tenth if necessary.The enrollment at a local college decreased 2% from last year's enrollment of 500. How many fewer students attended the school this year?
A. 490 students B. 510 students C. 100 students D. 10 students