Pl hell
a) 20a³-20a²+5a=?
b) -9x²+6x-1=?
c) -12a²+24ma-12m²=?​

How do you graph linear equation x+y=4

What is the slope of the line passing through the points (-5, 7) and (-3,5)?

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.