Answer: u = d/(t+4)
Step-by-step explanation:
By "subject", I assume you mean to make 'u' the independent variable by explicitly solving for it in terms of 't'. In order to do this, you must isolate 'u'. First, add 4 to both sides of the equation to get:
Next, inverse both sides. Take both sides to the power of -1, which is equivalent to putting a 1 over both sides:
Finally, multiply both sides by 'd' to get:
