Project #9770 - algebra questions

1 the graph of f(x)=-ax^2+bx-5 where a<0, opens up true or false? (don't need to show work)

2 the exact log of log8^8 times log8^9 is a. 2 b. 24 c 72 d none of the above (dont need to show work)

3. A simpl electrical circuit consists of a resistor and an inductor. The current that flows through the circui at time t is given by the formula I=20e -Rt/L where R is the resistance and L is the inductance. 

a. rewrite the equation for t

b. If the inductance is L=5 (in Henry) and the resistance is R=20 (ohms) what would be the time the current takes if I=5 (Amps)

4.Suppose the manufacturer of a gas clothes dryer has found that, when the unit price is p dollars, the revenue R in dollars is R(p)=-4p^2+4000p. what is the price of the revenue maximum? ( I did this part, the answer is $1,000,000, need help with b

b. for what range of prices will revenue exceed $800,000 show work

 

5 questions in all, 3 has two parts.

 

Subject Mathematics
Due By (Pacific Time) 07/26/2013 10:00 am
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