3 Evaluate 3a + 5 by substituting each value for a into the expression.

Sure, let's evaluate the expression 3a + 5 by substituting each value for a.

Step 1: Identify the expression The expression given is 3a + 5.

Step 2: Substitute the value of a Let's say the values of a are 1, 2, and 3. We substitute these values one by one into the expression.

When a = 1, 3a + 5 becomes 3*1 + 5 = 3 + 5 = 8.

When a = 2, 3a + 5 becomes 3*2 + 5 = 6 + 5 = 11.

When a = 3, 3a + 5 becomes 3*3 + 5 = 9 + 5 = 14.

So, the evaluated results of the expression 3a + 5 for a = 1, 2, and 3 are 8, 11, and 14 respectively.