The expression that represents the sum of the number of blue bikes and the 9 red bikes is B + 9. Option D
Algebraic expressions are expressions that consists of terms, variables, coefficients, and constants.
They are also made up of arithmetic operations such as division, addition, multiplication, subtraction, etc
From the information given, we have that;
B is the number of blue bikes
And there are 9 red bikes
The expression for the sum of blue and red bikes is written as;
B + 9
Thus, the expression that represents the sum of the number of blue bikes and the 9 red bikes is B + 9. Option D
Learn more about algebraic expressions here:
https://brainly.com/question/4344214
#SPJ1