How to solve equations with 2 variables with substitution and elimination?

What is 20,809 in word form and expanded form

Every morning, halle goes to school with a 1-liter bottle of water. she drinks 1/4 of the bottle before school starts and 2/3 of the rest before lunch. what fraction of the bottle does halle drink after school starts but before lunch?

Simplify the expression: . 45 -4+ -10

If n° = 64, what is the value of n? Explain.

Change fraction to decimal: 4/7 and round to the nearest thousandth?

Change 1 14 / 15 into percentage

If you were to roll the dice one time what is the probability it will land on 4

Bruce has a job that pays 92,000 per year. How much will she pay in social security taxes? (Social security taxes are 6.2% of earnings)

The table below shows the proportional relationship between the weight of cereal, in ounces, and the number of packs of cereal: Number of Packs of Cereal Number of Ounces of Cereal 3 39 4 52 5 6 What is the constant of proportionality? 13 39 42 78

Find the quotient of 63.49 divided by 7.1, round to the nearest hundred