exam Maths Puzzle Numerical Ability

simplify (3x-1y-2)

the -1 and -2 are exponents i just dont know how to type them in please help

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exam Other Question

Find the distance between (-3, -2) and (1, 4)

A) sqrt 10
B) 27
C) 2 sqrt 5
D) 2 sqrt 13

Can anyone help me understand this problem? Thank you so very much!!
8x^2+3y^2=50
2x + y =5