Her profit is $4.80 :)
$7.20•2=$14.40
24 pens • $0.80 =$19.20
$19.20-$14.40=$4.80 profit :)
When we say factor and solution, we mean to say the same thing. These terms may also sometimes be referred to as "roots". There is a law in mathematics which states that the number of solution in a given equation is equal to the highest exponent in the expression and for quadratic equation, the number of solutions should be 2.
If you use fractions, the answer you get will always be an exact answer in the form of a fraction. resorting to decimals means that you may run into rounding errors and therefore get only an approximate answer. e.g. the fraction 1/3 cannot be exactly represented by a decimal.fractions can be easier to represent the number rather then using decimals which involve writing out many numbers it does not affect the accuracy of the answer UNLESS you are rounding up and down the numbers
