Cyrus solved a quadratic equation. His work is shown below.
In which step did Cyrus make an error?
\begin{aligned} \dfrac{1}{3}(x-1)^2&=12 (x-1)^2&=36&\text{Step }1 x-1&=6&\text{Step }2 x&=7&\text{Step }3 \end{aligned}
3
1

(x−1)
2

(x−1)
2

x−1
x


=12
=36
=6
=7


Step 1
Step 2
Step 3

What's for breakfast? all people who ate at a certain restaurant were surveyed as to what they ordered on a particular sunday morning. 40 ate eggs 42 ate sausage 32 ate pancakes 13 ate sausage and eggs 15 ate pancakes and sausage 11 ate eggs and pancakes 6 ate all three items 3 people didn't eat any of the items how many people ate only pancakes? how many people ate at the resturant that morning? how many people didn't eat eggs?