What does it mean for a variable to have coefficients that are equal but opposite

A torch and a battery cost £2.50 altogether. The torch costs £1.50 more than the battery. What fraction of the total price is the torch? Give your answer in its simplest form.

What is an opposite like in negatives and stuff?

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1800 hours and a standard deviation of 35 hours. Using the empirical rule, what percentage of light bulbs last between 1765 hours and 1835 hours?

Your parents are buying a house for 187,500. They have a good credit rating, are making a 20% down payment, and expect to pay 1,575/month. The interest rate for the mortgage is 4.65%. What must their realized income be before each month?

If you have a 1 in 10 chance of winning, how many times will you need to try to win 1 time

the number of hot peppers in a salad is based on the number of servings as as shown in the table servings 2,4,8,12 hot peppers 4,8,?,24

The average of the first 3 weights was 20 pounds. The average of the next 12 weights was 25 pounds. What was the overall average of the weights

Use the matrix method to solve: x + 4y8 2x+y 9

Harley is loading 625 bagsof cement onto small pallets. Each pallet holds 5 bags. How many pallets will harley need?

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