Answer:
0.45x + 9.50 = 17.15
He bought 17 balloons
Step-by-step explanation:
Let x represent the number of balloons that he purchased.
Since they are $0.45 each, the price from balloons can be represented by 0.45x
Add 9.50 to this, to represent the price of the pinata, and set it equal to 17.15
So, the equation will be 0.45x + 9.50 = 17.15
Now, solve for x:
0.45x + 9.50 = 17.15
0.45x + 7.65
x = 17
So, he bought 17 balloons