How do I show my work for 90-(5x5) x2

What expression is equivalent to (2x-1)(x-3)?

£100.80 divided by 14 equals 7.2 how would we put this as money

Masons cell phone company charges $0.12 for every text message he sends plus $2.50 per month if mason sent 25 messages this month how much money does he owe the one with the correct answer and explanation gets 10 points and is marked as the brainliest answer