Witch pair of expressions are equivalent A. 2y-4 and 2y-4+9
B. 14x-7 and 7x-14 btw the x is not times it's just a letter
C.9y+3+2 and 3(y+1) +2
D. x + y and x-y+2y No the x is not times it's just a letter
E. x+2y and x-y No the x is not times it's just a letter

go and ask your mom to you

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

the multiples of 15 are 15, 30,45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195,   210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375,   390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, and 735.

the factors of 15 are 1, 3, 5, and 15.

hope that , fam!

-une, your fren : )