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
I'm sorry I don't know what this is can you explain it sike
For a cuboid's volume you simply go length x width x heigth so 2x4x5 so it's 40.
That would be 0.75:) hope this helps!