Do the values in the table represent a linear function? If so, write a function rule in slope-intercept form. Help please ASAP for a test

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?