Question

1. Which is an example of an algebraic expression?

Answer 1

1) 3-a because it has a variable

2) 5 + z because more than mean +

3) 4 times the sum of 21 and a number because it shows the bracket 

Answer 2

The answers are --> 

1.) 3 -a. An algebraic expression needs have a variable in it. In this case the variable is "a". So the answer is --> 3-a

2.) z+5. 5 more that z means 5 added to z. So, the answer is --> z+5

3.) 4 times the sum of 21 and a number n. In an algebraic expression, the brackets takes the highest order of preference. So, the answer is --> 4 times the sum of 21 and a number n