What is 168 divided by 12 but using estimation

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

Plzzz answer both questions and i will give you 100 points