Question 156441
without parentheses you do exponentiation first, then mult / div then + / -

so equation as shown is 3^2 / (1/3) + 3 * 6.

doing exponentiation first becomes 9 / (1/3) + 3 * 6.

doing mult/div next then becomes 27 * 18.

doing add/subtract next then becomes 45.

i don't see 21 as being a possible answer.