What is the meaning of the underlined digit 648? the underlined number is 4 on the question

An appliance store sells a washer-dryer combination for $1800. if the washer costs $300 more than the dryer, find the cost for each appliance.

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?

Does the point (1, sqrt 7) lie on circle shown.