Lillie read an average of 5 books per month in the first nine months of the year. in the last three months of the year, she read an average of 6 books per month. how many books did lillie read during the year?

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!