99!

test on relations and functions

1. find the inverse of the function f(x) = 3x – 7, show all work!

2. use a mapping diagram to represent the relation {(2,4), (3,4), (4,4), (5,4)}, state if the relation is a function.

3. draw a graph on the coordinate plan that represents a function. explain your reasoning!

for questions 4-8, use the above graph.

4. evaluate f(2).

5. list all x-intercepts.

6. evaluate f(-0.7)?

7. evaluate f(1.9)?

8. it the graph a function? explain your reasoning.

9. if f(x) = 3x-6, what is f(-9)?

10. if f(x) = 42 + 3, what is f(-2)?

i can only answer a few questions, sorry.

5. (-0.7, 0), (0.76, 0), (2.5, 0)

8. function because each input has only one output

9. -33

10. -81

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

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