exam Maths Puzzle Numerical Ability

Please help me find the solution to the following problem:

(12+-15)2

The 2 is the exponent

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exam Other Question

The sum of three numbers is 26. Twice the first minus the second is two less than the third. The third is the second minus three times the first. Find the numbers.
X+Y+Z=26 Solve each system by the addition method. Indicate whether each system is dependent, inconsistent, or dependent.

x+3(y-1)=11
2(x-y)+8y = 28