exam Maths Puzzle Numerical Ability

given: circle O with chords AC and BD.
prove: abcd is a rectangle

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Simple Anova
Exercise 12.7

(a) Use Excel, MegaStaqt, or Minitab to calculate a matrix of correlation coefficients.
(b) Calculate the critical valu i can not figure this out i do not knwo wha ta test point is

graph th einequality using the test point method

4x+3y greater than 24