Question

Evaluate the expression when$x=20\text{and}y=5$.

$0.5x+y$

Short answer

The value of the expression is15.

Step-by-step solution

. Order of operations

To evaluate any expression involving more than one operation, follow the below order of operations:

• First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
• Evaluate the exponents.
• Perform Multiplication and division from left to right.
• Perform addition and subtraction from left to right.

Step 2  . Multiply from left to right

To evaluate the given expression$0.5x+y$, substitute 20 for x and 5 for y and simplify further as shown below

$\begin{array}{c}0.5x+y=0.5\left(20\right)+5\\ =10+5\end{array}$

. Add the numbers

Now to simplify further, add the numbers to get

$\begin{array}{l}10+5\\ =15\end{array}$

Thus, the value of the expression is 15.