If pm * p8= p16, and (p9)n =p-27, what is the value of m-n?

The first rule you have to know is

In other words, if you multiply two powers of the same base, you have to sum the exponents. So, we have

Which equals if and only if and thus .

The second rule you have to know is

In other words, to evaluate the power of a power, you have to multiply the exponents. So, we have

Which equals if and only if and thus .

Now that we found and , it's easy to conclude that

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

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