Clear fractions then solve by substitution.
+ 
= 4
- 2y = 21
A. 
B. ?
C. {(-6, 8)}
D. {(6, -8)}
Answer: D
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Find the limit of the sequence or determine that the limit does not exist.an = 
A. does not exist B. ln 5 C. 0 D. 1
Solve the problem.The relationship between the number of units sold by a company and the profit is linear. If 5 units sold results in $110 profit and 37 units sold results in $814 profit, find the marginal profit.
A. $44 per unit B. $22 per unit C. $11.00 per unit D. -$22 per unit
Find the specified domain.For f(x) = x2 - 16 and g(x) = 2x + 3, what is the domain of 
?
A. (-?, ?)
B. 
C. (-?, -4) ? (-4, 4) ? (4, ?)
D. 
? 
Solve the problem.Arches in the shapes of parabolas are often used in construction. Find the equation of a parabolic arc that is 18 feet high at its highest point and 26 feet wide at the base, as illustrated in the figure. Place the origin at the midpoint of the base.
A. y = -x2 + 26
B. y = 
x2 + 18
C. y = -x2 + 18
D. y = - 
x2 + 18