Answer:
3x + 5 = 21
Explanation:
When it is asking you to write something as an equation, you have to pay attention to the wording.
Since it says 'five more than,' it means adding 5.
The next thing it says is 'three times a number.'
When you don't know the number you replace it with a variable, so in this case, we use x.
Three times a number would be written as 3x, so now that we have that, we can write the equation.
So first, it says five more than, so you would put:
__ + 5
It then says three times a number, so you put:
3x + 5
Lastly, it says equals 21, so you add the 21 in there:
3x + 5 = 21
hope this makes sense!