Select all the expressions that represent a price discounted by 20% of the price of an item that originally cost d dollars

Options :

A. 0.8d

B. d-0.2

C. d-0.2d

D. 1-0.2d

A. 0.8d ; d - 0.2d

Step-by-step explanation:

Given that:

Cost of item = d dollars

Discount on items = 20%

Expression represemting the discounted price :

(100% - 20%) x d

80% * d

0.8d

(100% - 20%) x d

(1 - 0.2)d

d - 0.2d

i believe the answer is c.

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,