let x = the price of a book
so you would have
total = 3x-20
Answer:
or 
Step-by-step explanation:
We know that the slope of the line is 1, so we can write it in terms of any two points belonging to the line, as per the difinition of slope:
We can use instead of 
any general point (x,y) on the line, and for 
the point we are interested in: (11,4)
That way the slope can be written as:
Next we can solve for y if this format is the one your instructor prefers:
First, divide 240 by 18 to find how many times 18 goes into 240
240/18=14 (rounded up from the original 13.3 repeating decimal because it has to do with people and you cant have a partial human and there is more than .0 there)
then multiply the number of people who do get pizza by that number
12*14=168
Answer:
The answer is $1.25
Step-by-step explanation:
She buys 4 notebooks for $2.50 dollars each.
Multiply 2.50 times 4 then you get $10.00
She buys pencils 10 for $0.75 each.
Multiply 10 times 0.75 and you will get $7.50
Then you add $10.00 + $7.50 which will give you $17.50.
Subtract $17.50 from $23.75 which will give you $6.25.
You divide $6.25 by 5 which will give you $1.25.
