Find a unit vector pointing in the same direction as the vector v = –3i + 2j.
What will be an ideal response?
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Write a chain rule formula for the following derivative.
for w = f(x, y, z); x = g(r, s, t), y = h(r, s, t), z = k(r, s, t)
A. 
= 
+ 
B. 
= 
+ 
+ 
C. 
= 
+ 
+ 
D. 
= 
+ 
+ 
Solve the problem.The formula v = 
can be used to estimate the speed of a car, v, in miles per hour, based on the length, L, in feet, of its skid marks upon sudden braking on a dry asphalt road. If a car is involved in an accident and its skid marks measure 45 feet, at what estimated speed was the car traveling when it applied its brakes just prior to the accident?
A. 40 mph B. 35 mph C. 25 mph D. 30 mph
Solve the problem.Find the value of n.
= 
A. 900
B. 
C. 121
D. 1
Solve the problem.A rectangular field is to be enclosed on four sides with a fence. Fencing costs 
per foot for two opposite sides, and 
per foot for the other two sides. Find the dimensions of the field of area 
that would be the cheapest to enclose. Round to the nearest tenth.
A. 30 ft @ $4 by 24 ft @ $5 B. 24 ft @ $4 by 30 ft @ $5 C. 33.5 ft @ $4 by 21.5 ft @ $5 D. 21.5 ft @ $4 by 33.5 ft @ $5