Question

Please help, for the second variable I couldnt read my own hand writting so im no sure if its f or r, someone please help soon

Answer 1

k =
`(fr^2)/(90)`

Explanation:

f = k
`(90)/(r^2)` ( multiply both sides by r² to clear the fraction )

fr² = 90k ( divide both sides by 90 )

`(fr^2)/(90)` = k