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By Margaret Gow

For college kids interpreting arithmetic, both as a part of a basic measure or as an ancilliary direction for an Honours measure, the topic could be provided in as ordinary a manners as is in keeping with a reasonable regular of rigour. This path in algebra, co-ordinate geometry and calculus is designed to fulfil those requisites for college students at Universities, Polytechnics and schools of know-how. The publication comprises 350 labored examples and 1550 perform examples chosen almost always from college exam papers. The perform examples were rigorously graded and a few tricks are given with the solutions in order that the booklet can be used for personal examine in addition to for sophistication paintings.

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Rl6 . r xi Rl7 = t xi 3 R40 = 1: xi RIa a ! Yi R43 2 2 Rl9 ! R20 ! Xi·Y i :E R36 :: 2 .. 4 1 R21 : n Yi where x and yare the values associated with each data point and n is the total number of points. 39 R9S a Rl7*R2l - (Rl6)2 R96 '" R2l*R36 - R17*RlB R07 R2l*R40 - R16*Rl7 R08 .. R29*R2l - R16*R18 RIJ9 ::I R21*R43 - (R17)2 The following terms must now be calculated in order to tain the coefficients of the equation: ob- Rl2 = (R9S - R07*R13)/R05 Ril = (RIB - R13*R17 - Rl2*R16)/R21 The coefficients of the best-fit parabola are: a = Rll b ..

The following formulas will estimate the coefficients of this equation when three or more points are given. Y must be a positive number greater than zero and x must not be equal to zero (any small number may be substituted for x when it is). ~>0 b)l 2 R22 l: l/x 1 R31 - l: (In R23 L l/X~ R47 1: (In Y i) /x i R3ril = l: In R21 yi y 1) =n where x and yare the values associated with each data point and n is the total number of points. 8 R22 ;: R23 "" R21 ,. l5 Rll R12 1. 104 1. 984 -1. 763 SUPER GEOMETRIC General Equation: This equation is similar to the power curve but changes much more rapidly.

A>0 b>9 1: xi 2 R4" ,. - l: Rl7 4 2. xi Yi where x and yare the values associated with each data point. 26 PARABOLA THROUGH A GIVEN POINT a + bx + cx 2 y = General Equation: This equation represents a parabolic curve that is constrained to pass through the point h,k. The following formulas will estimate coefficients of the equatIon that best fits the data when four or more points are given. Subtract h from each x value and k from each y value when calculating the sums. X and y may be positive, negative, or zero.

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