15. Solve the equation by using the quadratic formula. (Enteryour answers as a comma-separated list.)
x2 ? 4x ? 4 = 0
(a) Give exact real answers.
x =
(b) Give answers rounded to two decimal places.
x =
16. Use any method to find the exact real solution, if itexists. (Enter your answers as a comma-separated list. If there isno solution, enter NO SOLUTION.)
(w^2/6) - (w/3) - 4 =0
w=
17. Solve using quadratic methods. (Enter your answers as acomma-separated list.)
(x + 5)2 + 5(x + 5) + 4 = 0
x =
18. Consider the following equation.
y = (-1/22)x^2 +x
(a) Find the vertex of the graph of the equation.
(x , y) = ( )
(b) Determine if the vertex is a maximum or minimum point.
(c) Determine what value of x gives the optimal valueof the function.
x =
(d) Determine the optimal (maximum or minimum) value of thefunction.
y =
20. The daily profit from the sale of a product is given byP = 14x ? 0.1x2 ? 50 dollars,where x is the number of units of production.
(a) What level of production maximizes profit?
units
(b) What is the maximum possible profit?
$
21. If the supply function for a commodity is p =q2 + 14q + 49 and the demand functionis p = â11q2 + 92q + 469,find the equilibrium quantity and equilibrium price.
(q, p) = ( )
22. The supply and demand for a product are given by 2p? q = 80 and pq = 100 + 35q,respectively. Find the market equilibrium point.
(q, p) = ( )
23. The total costs and total revenues for a company arerepresented by the equations shown below, where xrepresents the number of production units. Find the break-evenpoints. (Enter your answers as a comma-separated list.)
C(x) = 2100 + 20x +x2
R(x) = 120x
x = units
24. If, in a monopoly market, the demand for a product isp = 130 ? 0.40x and the revenue function isR = px, where x is the number of unitssold, what price will maximize revenue? (Round your answer to thenearest cent.)
$
28.
The monthly charge (in dollars) for x kilowatt hours (kWh) of electricity used by a commercial customer is given by the following function. 7.52 + 0.1079 if 0 20 C(x) = 19.220.1079 if 20
Show transcribed image text The monthly charge (in dollars) for x kilowatt hours (kWh) of electricity used by a commercial customer is given by the following function. 7.52 + 0.1079 if 0 20 C(x) = 19.220.1079 if 20