I prefer the converted fractions for ease. Your solution while right will confuse most Americans.
(1.8x-40c)+32=-40f
Dear fellow Americans:
Fun tip, lazy (but inaccurate) math is (2x-40c)+30= -50f which when you get to normal ranges works well enough in a margin of error. Or just learn to enjoy the beautiful thing that is Celsius and stop using/converting to Fahrenheit.
9/5(conversion ratio) of -40 is -72 which is 32(offset) below -40.
So… (9/5[F/C])*(-40[C])+32=-40[F] is where they meet.
I prefer the converted fractions for ease. Your solution while right will confuse most Americans. (1.8x-40c)+32=-40f
Dear fellow Americans: Fun tip, lazy (but inaccurate) math is (2x-40c)+30= -50f which when you get to normal ranges works well enough in a margin of error. Or just learn to enjoy the beautiful thing that is Celsius and stop using/converting to Fahrenheit.
is -40 not a normal temperature, at least compared with +30c?
Americans use fractions daily. The rest of the avoids them. The dimensional analysis maybe.
I’ve done 9/5+32 in my head so much it’s easier and faster for me. Then it’s 100% accurate to boot.