Science center the expression 20a + 13c is the cost (in dollars) for a adults and c students to enter a science center. a. how much does it cost for an adult? a student? explain your reasoning. b. find the total cost for 4 adults and 24 students. c. you fi nd the cost for a group. then the numbers of adults and students in the group both double. does the cost double? explain your answer using an example.

Following are the solution to the given points:

For point a:

For point b:

When the Total cost

Where

Calculating the total cost for 4 adults and 24 students

For point c:

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Step-by-step explanation:

A.  It costs $20 per adult.  If this is a cost fuction, which it is because the wording is "the cost (in dollars) for a adults and c students", adult is a, the cost for 1 adult, 1a, is 20.  That relates the number of adults to the cost of 1 adult.

It costs $13 per student.  Again, this is a cost function, so since student is c, the cost for 1 student, 1c, is 13.  That relates the number of students to the cost of 1 student.

B.  The total cost for 4 adult and 24 students looks like this:

20(4) + 13(24) which is 80 + 312 = $392

C.  If you have 3 adults and 3 students in your group, the cost is 20(3) + 13(3) which is $99.  If you double the number of each, let's see if the cost doubles.  We will "up" the numbers to 6 each.  20(6) + 13(6) = $198.  Is $198 the double of $99.  Yes it is.  Let's do it again to check.  Let's double the 6.

20(12) + 13(12) = $396, and $198 doubled does in fact equal $396. So there you go!

answer: for each 3 girls there is 2 boys . 3: 2

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