exam Maths Puzzle Numerical Ability

how could you use a calculator with only +, -, x, and division keys to check these claims about values of expressions involving fractional exponents?

a- 225 1/2 =15

b- 7 1/2

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exam Other Question

Please help. I do not even know what to call this.
Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.

2x+3y=1
5x+3y=16 find three consecutive even integers such that four times the second is eight less than the third.