Answer:
16 tvs
Explanation:
Maura's earnings for the week equal her weekly salary (460) plus she earns 6.5% commission x number of flat screens sold x $414.
So: Total Earnings = 460+ 0.065*414*t where t is the number of tvs she has sold.
If total earnings = 890.56, just substitute that above and solve for t.
890.56= 460+ 0.065*414*t
430.56=0.065*414*t
430.56=26.91*t
430.56/26.91 = t
16 = t
She sold 16 tvs to earn 890.56.