State whether each equation is in standard form. If not, explain why. 1) x + y² =25
2) 2x +y = 12
3) 3x-5y = 10
4) 4x = -2y +3
5) 5x+10y = 15
6) y = 4x² - 1

i am not sure :

step-by-step explanation:

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

well, because the $0.25 is an added cost depending on how many minutes, the answer would be y = 30 + 0.25x.