+0  
 
0
64
2
avatar+536 

A marathon runner drinks one bottle of sports drink for every 3 miles he runs, and the number of bottles he drinks as a function of the number of miles he runs can be described by the function B(m) = m/3. The cost of a bottle of sports drink is $1.25, and the cost in dollars of the sports drink that the runner consumes as a function of the number of bottles he drinks can be described by the function C(b) = 1.25b. If the runner runs 24 miles, how much does the sports drink he consumes cost? 

 

a) $30 

b) $3.75 

c) $1.75 

d) $10 

Julius  Jan 18, 2018
Sort: 

2+0 Answers

 #1
avatar+6250 
+2

B(m) = m/3       ...this means...     number of bottles  =  m / 3

 

C(b) = 1.25b     ...this means...     cost  =  1.25( number of bottles )

 

So...   cost  =  1.25( m / 3 )

 

cost   =   1.25( 24 / 3 )   =   1.25( 8 )   =   10

hectictar  Jan 18, 2018
 #2
avatar+11128 
+3

The number of 3 mile 'sets' that he runs  is    24/3 = 8 'sets'   or 8 bottles of sports drink.

 

8 bottles  x  $1.25 / bottle = $10.00

ElectricPavlov  Jan 18, 2018

17 Online Users

avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details