exam Maths Puzzle Numerical Ability

Please help solve:

7.55<0.75x-2.5<=8.5

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exam Other Question

ax2+bx+c=? r=-b+/- ^b2-4ac over 2a Can someone please the time to help me solve this equation √x-2 equals 6√x^3-26 (the x^3-26 is all under the square root sign) I would really appreciate it if you did help me.

thank you