Which method can be use to solve all quadratic equation? explain

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11