The difference between two numbers is 28. Two times the lower number plus the bigger one equals 103.
What is the bigger number?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read