book Maths Puzzle Numerical Ability

graph the function and state the domain and range.

28. y=sqrt x-2

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book Other Question

two parallel chords, 16 cm and 30 cm are 23 cm apart. find the radius of the circle that contains them. Max Z = 5x1 + 6x2
subject to: 17x1 + 8x2 <= 136
3x1 + 4x2 <= 36
x1, x2 >= 0 and interger
What is the optimal soulition? Z =? Put the answer in the form xx with no additional nu