exam Maths Puzzle Numerical Ability

Please help me solve for a,b,c, and d

a+b+c+d=8
a+b+c+2d=7
a+b+2c+3d=3
a+2b+3c+4d=4

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exam Other Question

Could you help me with this?

Its on simplifying radical expressions.

sqrt of 81x^5y^9 and it has an index of 4

thank you Question 87686: Which does not represent a possible intersection of a line and a rectangle?: Which does not represent a possible intersection of a line and a rectangle?
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