Why is the opposite of a negative number a positive number?

You can tile 2/5 of a floor in 3/4 of a day. How much of the floor can you tile in one full day? What computation can you do to describe this situation?

Lacey is attending a university where the cost for one year is $10,500. She has a scholarship worth $6,000 and a grant worth $900. She earns $45 a day at her job. How many days does she need to work to pay for 50% of the remaining amount?

Solve with work shown. X/3+6 equals - 6

The sum of three consecutive numbers is 72. What are the smallest of these numbers?

A bag contains 10 marbles. Four ofthem are red, three blue, two white, and one yellow. A marble is drawn at random. What is the probability that it is blue?

Simplify the expression. (2x5) 4 2x20 16x20 16x9 2x625

43/14 as a decimal rounded to nearest tenth

Evaluate the summation of 25 times 0.3 to the n plus 1 power, from n equals 2 to 10.

There are 7 people at a party. Each person must shake hands with all the other people at the party once. How many handshakes does it take to do this?

Nakida worked 55 days and sold 10 phone plans. Aiesha worked 40 days and sold 8 phone plans. On average, how many phone plans did Nakida sell in one day? On average, how many phone plans did Aiesha sell in one day?