Multiply the three numbers together.
What is 6 * (-2) * (-1) ?
Hint: negative times negative = positive.
Now multiply the variable r.
What is r^3 * r * r^2?
Hint: r alone is the same as r^1; add the exponents.
Now multiply the variable s.
What is s^5 * s^3 * s?
Hint: s alone is the same as s^1; add the exponents.
Now put it ll together.
What do you get?
