Pretty sure it's the last one.
We're looking for
such that

Multiplying both sides by
gives us

Notice that when
, the term involving
vanishes and we're left with

Then

so that

Answer:
by factorising it we get , (2x + 1) • (x + 3)
Step-by-step explanation:
for solution see the attached picture. ...
Answer:
b
Step-by-step explanation:
It would take him 66 minutes longer to deliver 100 papers than 72 papers