Evaluate the expression.n + 
, if n = 
A. 
B. 
C. 6
D. 
Answer: B
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = (6t sin t + 6cos t)i + (6t cos t - 6 sin t)j - 6k
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
Solve the equation.
= 
- 
A. {6} B. {3} C. no real solution D. {3, 6}
Provide an appropriate response.Would a drop of 30 Celsius degrees be more or less than a drop of 30 Fahrenheit degrees? Explain why.
What will be an ideal response?
Solve the problem.A person standing close to the edge on top of a 64-foot building throws a baseball vertically upward. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. How many seconds does it take until the ball finally hits the ground? Round to the nearest tenth of a second if necessary.
A. 2 sec B. 4.8 sec C. 0.8 sec D. 128 sec