exam Maths Puzzle Numerical Ability

Can you help me solve:

3b-a=-7
5a+6b=14

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exam Other Question

simplify square root of 75a^2
over
square root of 5
Will you help me solve this px

7. (4 pts) A drinking glass is in the shape of a cylinder that is 60mm in diameter and 15cm tall. How many cubic centimeters of water will it hold?