Question

Evaluate each expression if $g=2$, $r=3$and $t=11$.

$7-gr$

Short answer

The value of the expression $\mathbf{7}\mathbf{-}\mathit{g}\mathit{r}$is 1.

Step-by-step solution

Step 1. Evaluation of algebraic expression.

In order to evaluate an expression, substitute the values for the variables and simplify using the order of operations. The order of operations is in order:

1. Evaluate the expressions inside the bracket
2. Evaluate the powers
3. Multiply and/or divide
4. Add and/ or subtract

The evaluation takes place from left to right.

Step 2. Replace the variables.

Substitute 2 for g, 3 for 3, and 11 for t into the equation $7-gr$.

$7-gr=7-2\times 3$

Step 3. Apply the order of operations.

As per the order of operations, first, multiply 2 by 3, then subtract the result from 7.

$\begin{array}{l}7-gr=7-2\times 3\\ =7-6\\ =1\end{array}$

Therefore, the expression is equal to 1.