exam Maths Puzzle Numerical Ability

Simplify and match your result to the correct answer below.

7 2
_ - _ =4
w 13

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exam Other Question

Solve system using the subsitution method"
x^2+3y=25
x+y=7 9/5c+32=f for c
i dont no the answer but when you answer this please explain to me how you got that particular answer.
Thank You!