Expressions using Letter-Numbers

Answer

Letter-numbers are letters (like a, b, x, y) that are used to represent numbers in mathematical expressions. For example, if 'a' represents Aftab's age, then 'a' is a letter-number.

Answer

An algebraic expression is a mathematical expression that contains letter-numbers along with numbers and operations. Examples: a + 3, 2x - 5, 3m + 7. These expressions can represent relationships and

Answer

Shabnam's age = a + 3 Since Shabnam is 3 years MORE than Aftab, we add 3 to Aftab's age (a).

Answer

Aftab's age = s - 3 Since Aftab is 3 years YOUNGER than Shabnam, we subtract 3 from Shabnam's age (s).

Answer

a + 3 = 23 + 3 = 26 We substitute the value of a (which is 23) into the expression and then calculate.

Answer

4 × n is written as 4n In algebra, we omit the multiplication sign (×) and write the number first, followed by the letter-number. So 4 × n becomes 4n.

Answer

7k = 7 × 4 = 28 7k means 7 × k, so when k = 4, we get 7 × 4 = 28.

Answer

5m + 3 = 5 × 2 + 3 = 10 + 3 = 13 First substitute m = 2, then calculate 5 × 2 = 10, and finally add 3.