What are some situations in which estimating a sum or difference is useful? why is it useful in these situations?

Suppose I am in a store buying a shirt, a tie, and slacks. Each of the prices ends in 99 cents, and it is hard to add the exact amounts in my head. I can make an estimate, and decide if this is too much to spend or not.

What exactly are these situations can you tell me and maybe I could help you out.

The equation is 6 × (x + 1) = 2 × (x + x + 1)

The integers are negative (-5, -4, -3)

Step-by-step explanation:

The numbers Chloe is trying to find = Three consecutive positive integers

The nature of the numbers Chloe is trying to find = The product of 6 and the largest of the three numbers = 2 × The sum of the two smaller integers

To set up the equation, we proceed as follows;

Let the three numbers be x, x + 1, x + 2

Therefore, the equation is given as follows;

6 × (x + 1) = 2 × (x + x + 1)

We simplify, to get;

6·x + 12 = 2·x + 2·x + 2

6·x + 12 = 4·x + 2

6·x + 4·x  = 2 - 12

2·x  = -10

x = -10/2 = -5

The integers are;

-5, -4, -3