7n²mp⁴ • 3n³m⁴p-⁴ (that's supposed to be a negative exponent)

When we are multiplying eponents with the same base, we do is writing the sum of both exponents:

SO, in our case:

We have to do this three times and multiply the numbers:

= (any number whose exponent is equal to 0 has a value of 1) =

So now we know that =

the first is 13 the second is 1 the third is 8 and the fourth is 7