How would you use a number line to determine the sum of two negative integers

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0