Astore is having a 20% off sale michael says that he can find the sale price of an item that has a regular price of p dollars by evaluating the expression 0.8p susan says that she can find the sale price for the same item by evaluating the expression p-0.2p who is correct

Both are correct.

Step-by-step explanation:

Hi, both are correct.

Since the discount is 20%, to obtain the amount of the discount we have to multiply the price (p) by the sale percentage discount in decimal form (20/100=0.2)

So, it will be: 0.2p  

If we subtract that amount to the original price, we obtain the sale price.

p-0.2 p ( Susan's method).

Since the discount is 20%, and the whole price is 100%,the sale price is equal to : 100%-20%= 80%

We also can calculate the sale price by multiplying the price (p) by the sale price percentage in decimal form (80/100=0.8).

p0.8 (Michael's method)

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,