Question 297102
You need 30 tons of rock to cover the area.


That is fixed.


30 * 60 = $1800.


You have $2500 to spend.


$2500 - 1800 = $700.


You have $700 to spend on trees.


$700 / $84 = 8.333333333 trees.


You can buy up to 8 trees.


the formula you would use is as follows:


Let T = number of trees.
Let R = number tons of rocks.
Let x = price per ton of rocks.
Let y = price per tree.


the general formula you would use is


T <= {{{(2500 - (x*R))/y}}}


When x = $60 and R = 30 and y = $84, this formula becomes:


T <= {{{(2500 - (60*30))/84}}}


Simplify this equation to get:


T <= {{{(2500 - (1800))/84}}}


Simplify further to get:


T <= {{{700/84}}}


Simplify further to get:


T <= 8.333333333


Since you can't buy a partial tree, you can buy up to 8 trees.


"<=" means less than or equal to