How would I find 0.8 on a ruler? (No links or random comments)

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?