Final answer:
To turn the sentence 'half the sum of a number and five is four' into an equation, we need to identify the unknown number and represent it with a variable. We can use the equation 1/2(x + 5) = 4.
Step-by-step explanation:
In order to turn the sentence 'half the sum of a number and five is four' into an equation, we need to identify the unknown number and represent it with a variable. Let's call the unknown number 'x'.
The sum of the number and five can be written as 'x + 5'. To find half of this sum, we can write it as '1/2(x + 5)'. And we know that this value is equal to four, so we can set up the equation:
1/2(x + 5) = 4