Answer:
3^15
Step-by-step explanation:
3^5 means 3*3*3*3*3
3^10 means 3*3*3*3*3*3*3*3*3*3
so 3^5 * 3^10 means 3*3*3*3*3 * 3*3*3*3*3*3*3*3*3*3 = 3^15
The rule is that you can add the exponents if the base number (3) is the same.
