Question

I need help with this please

Answer 1

t = D/Mr - 1/r or (D - M)/Mr

Explanation:

D = M + Mrt

isolate t

D - M = Mrt

(D - M)/M = rt

D/M - 1 = rt

D/Mr - 1/r = t

Answer 2

t =
`(D-M)/(Mr)`

Explanation:

Given

D = M + Mrt ( subtract M from both sides )

D - M = Mrt ( divide both sides by Mr )

`(D-M)/(Mr)` = t