Answer:
The expression that can be used is 0.80x
Step-by-step explanation:
Let
x ----> original price of an item
Remember that

That means---> the sale price is 80% of the original price
To find out the sale price, determine the 80% of the original price
----> percentage in decimal form
Multiply the original price by the percentage in decimal form to obtain the sale price
so

46%d+57%y=55%x42
x+y=42
Find y
x=42-y
46%(42-y)+57%y=23.1
19.31-46%y+57%y=23.1
11%y=23.1-19.31
11%y=3.79
y=34
The answer is D
Distribute the numbers, solve for y. y= 4
Therefore, 49/21 simplified to lowest terms is 7/3.
Convert fraction (ratio) 21 / 49 Answer: 42.857142857143%
The simplest form of 4949 is 11.
The simplest form of 4921 is 73