exam Maths Puzzle Numerical Ability

Find the distance between -2 and 13 using absolute value.

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exam Other Question

the modulus or absolute value of a complex numbers:

if z2=4+3i and z2=-2+3i what is /z1/ and /z2/?
Please help me find the other extreme: ratical 12 is the gepmetric mean between a and b. Find b if a = 3.