What is the sum of the given polynomials in standard form?

(x2 – 3x) + (–2x2 + 5x – 3)

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

This is different from the first one can someone me

Plz. yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?