Answer:
3
Explanation:
The equation
p = 9 + 1.5x
gives us the price of pizza depending on toppings
Where
p is the cost of pizza
x is the number of toppings
Now, Daniel took a pizza that costed 13.50. We need to find number of toppings. We can put 13.50 into p (since this is the cost) and solve for x to find number of toppings. Shown below:
![p=9+1.5x\\13.5=9+1.5x\\13.5-9=1.5x\\4.5=1.5x\\x=(4.5)/(1.5)\\x=3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/k33baygma2pl15n2m04m6155ehe7wha6ly.png)
So, Daniel got 3 toppings