exam Maths Puzzle Numerical Ability

You roll a dice. What is the probability the sum of the first roll is 7 and the sum of the second roll is 10?

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exam Other Question

Simplify : -2^0 + (16(^5/4))/(125^-2/3) I think the answer is 801 or 799??? Can someone please help me ?? x + 2y = 0
4x -z = 4
5y + z = -1

solve each system using substitution