An electronics store sells an average of 60 entertainment systems per month at an average of $800 more than the cost price. For
every $20 increase in the selling price, the store sells one fewer
system.
a. What amount over the cost price will maximize revenue?
b. What is the maximum revenue?
C. How much more money will the store make over the next
year?

quit

step-by-step explanation:

x =-.20752

step-by-step explanation:

4^(x+2)=12

4^(x+2)=12

take the log base 4 on each side

log 4 (4^(x+2) = log 4(12)

we know log b(a^y) = y log b (a)

(x+2) log 4(4) = log 4 (12)

x+2 = log 4 (12)

we know   logb c = loga c/loga b

we want to convert to base 10   so a = 10

by default, we do not write the 10   c = 4   and b = 10

log4 10 = log 12/log 4

log4 10 = log 12/ log 4

x+2 = log 12/ log 4

subtract 2 from each side

x +2 -2 = log 12/ log 4 -2

x = 1.79248125 -2

x =-.20752

93-8=85

855=17

17*4=68

there are 68 purple marbles in that bag