book Maths Puzzle Numerical Ability

a tangent to a circle ______ the radius drawn to the point of tangency.

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book Other Question

PLEASE HELP ME WITH THIS EQUATION.

2/5+4/10X+5=7/2X+1
Solve the system of equations for x and y by the addition method

2x-4y+3z=17
x+2y-z=0
4x-4-z=6

Eliminate 1 variable at a time