The answer is 13. The work is below
(4x-7y)(4x+7y)
4x times 4x= 16x^2
-7y times 7y= -49y^2
Area = length x width
area = 2 3/4 x 2/5
area = 1 1/10 feet :)
Answer:
She paid 9% of sales tax
Step-by-step explanation:
The sale price of diamond = $375
Let x be percent of sales tax
So, amount of tax = 
So, Amount including tax = 375+3.75x
We are given that Bethany paid $408.75 for a pair of diamond stud earrings.
So, 375+3.75x=408.75
3.75x=408.75-375

x=9
Hence She paid 9% of sales tax