Substituting Variables

Write the following statement as a mathematic expression with variable(s):

> Ben has 35 crisps. That is 7 times more than Ryan has.

Which of these could be a variable?

Evaluate the expression  $$7b$$  if b= 5. 

Note: when a number is next to the variable, it means multiply.

(a)  

Evaluate the expression  $$9m$$  if m=2 

What is w - 9 when w = 15?

What is the value 3y + 1 when y=5?

Which value of k would make the expression 10 - k equal 3?

Evaluate the expression ab + c when a = 2, b = 7, c = 1

Which expression is equivalent to 12 when b = 2?

Evaluate each expression below(substitute the variables)

(a)