Which line is a linear model for the data.

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

How to use order of operation in 20 divide by 4 multiply 5 = 1

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c