book Maths Puzzle Numerical Ability

What happens to the volume if the length is doubled, the height is doubled, and the width is tripled?

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Having trouble This Problem in my Algabra class.
The problem is
Which of the ordered pairs
(-1, 2), (7, 0), (3, -1), (-17, 6)
are solutions for the equation x + 4y = 7?


Thnks you
On a string of pearls, the middle pearl is the largest and most expensive of all. Starting from one end, each pearl is worth $100.00 more that the one before it up until the middle