What has to be true if you want to convert one rate to another rate?​

i think it might be the "units of the first rate are both/all distinct from that of the converted rate, but it still represents the same measurement."

Step-by-step explanation:

it's d.

step-by-step explanation:

because: -1(4x + 1y) +2 (1x-3y) distribute each number into the parenthesis.

then you would get: -4x - 1y + 2x -6y combine like terms

and get: 2x -7y

hope my answer has you if not then i'm sorry.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225