Basketball player salary = $1.8 x 10^6 / year
Teacher salary = $ 5.6 x 10^4 / year
Convert the teacher's salary to the same exponent as the Basketball player salary.
Teacher's salary = $5.6 x 10^4 = $0.056 x 10^6
Substract = 1.8 x 10^6 - 0.056 x 10^6
= 1.744 x 10^6
Result
$1.744 x 10^6