Read https://www.wyzant.com/resources/answers/2997/how_do_you_figure_out_how_to_determine_the_best_method... and I think that will answer your question (:
Answer:
Carla pays $21.4 for the dress with tax.
Step-by-step explanation:
Here we are given that :
Price of dress = $20
Sales tax = 7%
Price of dress with tax = $20 + 7% of 20
Price of dress with tax = 20+1.4 = 21.4
Price of dress with tax = $21.4
Carla pays $21.4 for the dress with tax.
rearrange the equation to where you set it equal to 0 by moving the 25 over.
n2 - 8n -9 = 0
now factor
(n-9)(n+1)
so n1 = 9
n2 = -1
