Aman moves to lie on an island in europe. he has a choice of two water companies:
manana water: no standing charge. pay £0.06 per m3 of water used.
channel water: standing charge: £30 every 3 months
£0.02 per m3 of water used
special offer: 20% off your first bill.
he estimates that he uses 700m3 of water every 3 months. which company should he choose?

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

)

sorry, can't i suggest going to algebra.com

step-by-step explanation: