When I multiply 6v^9*10v^7 I get

60v^16

My question is, do I add the 9+7 or multiply the 9*7?

Well... as you said, you get v^16... so would it be 9+7=16 or 9*7=16?

it would be 9+7

Good job! Sorry I posted the same thing twice because my net froze.

To multiply expressions with the same base, you add the exponents. In this case, you have (6v^9)*(10v^7).

When you multiply the coefficients (6 and 10), you get 60.

For the variables, you multiply their coefficients and add their exponents. In this case, you have v^9 * v^7. The coefficient of v is 1, so when you multiply 1 * 1, you get 1. And when you add the exponents (9 + 7), you get v^16.

So, the correct answer is 60v^16.