You can only unlock the chapter using a special code that we will send you via the Viber app. Receiving a message is free of charge and with no obligations.
My phone number:
Get a code
In compliance with the law, persons under the age of 15 can enter their phone number only in the presence of a parent or guardian.
4-character code:
Check the received code
The page will be refreshed automatically in a few seconds.
To ensure the proper functioning of the website, OpenProf uses cookies that do not store personal data. By continuing to use the website, you agree to cookies. Tell me more »
is to assign to each real number 4-times its value. Write down the expression for the function 
.
is to assign to each real number 5-times its value. Write down the expression for the function 
.
is to assign to each real number a number that is 4 less than its value. Write down the expression of the function 
.
, is to assign to each number a number that is 4 greater than its value. Write down the expression for the function 
.
pounds for the delivery of coal, but for each kilogram of coal purchased, the price of transport is reduced by 
pounds. Write down the dependence of the transport price on the transported kilograms of coal 
. How many pounds is the price of transportation when buying 
kilograms of coal?
for each ride and additional 
for each kilometer travelled. Write down the dependence of the transport fare on the number of kilometers traveled 
. How many pounds is the transport fare from point A to point B if the distance between them is 
