13 < 2n - 5 < 21
19
To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.13+6= 1919/2= 9.59.5 (that's nine and a half) is midway between six and thirteen.
It is: (13+41)/2 = 27
22(13+31)/2
Thirteen = 13
Twentyone follows twenty
Someone needed something to fit in between 12 and 14. The number thirteen came about when people realized that something had to come between twelve and fourteen. When they added 3 + 10 or 8 + 5, they needed a number to result. Hence: thirteen.
22
19
Twice the difference between a number and thirteen can be written as 2 (b - 13) Five more than twice the difference between a number and thirteen can be written as 2 (b - 13) + 5. The algebraic expression is 2 (b - 13) + 5.
To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.13+6= 1919/2= 9.59.5 (that's nine and a half) is midway between six and thirteen.
The number 1,234,567,890,123 has thirteen digits.
It is: (13+41)/2 = 27
22(13+31)/2
The number 13 is spelled "thirteen".thirteen
You write it as an equation, and then solve the equation.
(5 + 13)/2 = 18/2 = 9