How do you write a numerical or variable expression for each quantity: the value in cents if 7nickels?
We're being asked to write an expression that expresses the value, in cents, of seven nickels.
First we need to know the value of a nickel. It's 5 cents. So let's write that as:
Next step is to write down the number of nickels. There are 7 of them. Since
Ok, so if we have 7 nickels and so have
And we can simplify it to:
To write a variable expression for this (which would tell us how to calculate how many cents an unknown number of nickels would be), we would write it like this: