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:

link

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:

(-8,7)

explanation:

we know that  

f

(

−

3

)

=

7

therefore, if we wish to get the output as 7, in the function, we need to have our input to be -3.

looking at the function  

f

(

x

+

5

)

, what should the value of x be, such that the input in the function becomes 7?

we simply equate the terms,

x

+

5

=

−

3

x

=

−

8

thus, the point on the new function would be  

(

−

8

,

7

)