A linear regression line y = 10 + 0.9x is computed to predict the final exam score y on the basis of the first score x on the first test. Suppose Maria scores a 87 on the first test. What would be the predicted value of her score on the final exam?
A) 81
B) 89
C) 91
D) 88
E) 93
D) 88
Mathematics
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Find the unit tangent vector of the given curve.r(t) = (5t cos t - 5 sin t)j + (5t sin t + 5 cos t)k
A. T = (-sin t)j + (cos t)k
B. T = (5 cos t)j - (5 sin t)k
C. T = - 
(sin t)j + 
(cos t)k
D. T = (-5 sin t)j + (5 cos t)k
Mathematics
Convert the units using unit fractions.6
hr = 
min
A. 390
B. 
C. 156
D. 
Mathematics
Solve the problem.The logistic growth function f(t) = 
models the number of people who have become ill with a particular infection t weeks after its initial outbreak in a particular community. How many people were ill after 5 weeks?
A. 200 people B. 35,000 people C. 35,875 people D. 29,716 people
Mathematics
Find the measure of the indicated angle. The figure is not drawn to scale.Find the measure of ?x.
A. 55° B. 115° C. 60° D. 150°
Mathematics