Question

Find the value of the expression 4a + 7 when a = 1/2

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Answer 1

9

Explanation:

4×1/2=2 and adding on 7 would make 9

Answer 2

9

Explanation:

Expressions are mathematical statements without equal signs.

Expressions and Variables

Expressions are simply combinations of different numbers and operators. The reason 4a + 7 qualifies as an expression is because it has 2 values connected by an operator and no equal sign. In this expression, there is multiplication and addition.

Variables are letters in equations or expressions that represent some numerical value. Variables can represent any number, but in this case, we are told a = 1/2.

Solving the Expression

To solve the expression, all we need to do is plug 1/2 into the expression.

• 4(1/2) + 7

Then, multiply,

• 2 + 7

And add,

• 9

So, when a = 1/2, 4a + 7 = 9.