Final answer:
To simplify the expression 21m^42n^32p^10 ÷ 3m^21n^16p^5, divide the coefficients and subtract the exponents for each variable. The simplified expression is 7m^21n^16p^5.
Step-by-step explanation:
To simplify the expression 21m^42n^32p^10 ÷ 3m^21n^16p^5, we can divide the coefficients separately and then subtract the exponents for each variable.
Dividing the coefficients, we get 21 ÷ 3 which is 7.
Next, subtracting the exponents of m, we get 42 - 21 = 21. Similarly, subtracting the exponents of n, we get 32 - 16 = 16. And subtracting the exponents of p, we get 10 - 5 = 5.
Putting it all together, the simplified expression is 7m^21n^16p^5. Therefore, option (a) 7m^21n^16p^5 is the correct answer.