ASAP ANSWER WITH WORK

A phone sells for $550. It is on sale for 1/4 off the original price. Sally has an extra 10% off the sale price.
To the nearest dollar, what is the total discount that Sally will receive?

What is the value of r of the geometric series?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

With this question, the answer with the red arrow is incorrect!