Find the quantity indicated.Suppose that y is directly proportional to x. When x = 18, then 
Find y when 
A. 36
B. 34
C. 144
D. 63
Answer: A
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Solve the problem. Round to the nearest tenth, if necessary.If an object is thrown upward with an initial velocity of 
, its height after t sec is given by 
. Find the maximum height attained by the object. (The object will attain maximum height exactly at the halfway point in terms of the time t, where t = 0 is at the beginning of the object's flight, and the final time is when the object hits the ground.)
A. 100 ft B. 64 ft C. 80 ft D. 84 ft
Simplify the root. 
A. - x7
B. x7
C. 
D. - 
Find the equation of the hyperbola satisfying the given conditions.Center: (0, 0); focus: (0, 5); vertex: (0, 3)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Given the cost function, C(x), and the revenue function, R(x), find the number of units x that must be sold to break even.C(x) = 0.8x + 320R(x) = 1.2x
A. 820 units B. 800 units C. 201 units D. 810 units