Viete's formulas - what are they used for? if we have a quadratic equation 2x^2 + 4x -6 = 0, whose roots are x1=1 and x2=-3 and where a = 2 b=4 and c=-6 then according to viete's formulas (x1 + x2) = (-b/a) and (x1 • x2) = (c/a). i suppose these formulas could be used as a double check for calculating the roots but do they serve any other purpose? (i also know there are other viete's formulas for cubic, quartic, etc. equations).

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?

Do social recommendations increase ad effectiveness? a study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media recommendation link to viewers who arrived at the same video by web browsing. data were collected on whether the viewer could correctly recall the brand being advertised after seeing the video. the results are given below.correctly recalled the brandarrival 409153browsing20484b. conduct the hypothesis test, using the 0.025 level of significance.what is the value of the test statistic? χ2stat=what is the p-value? p-value=is this value significant atα=0.025?

If you could answer these your a life saver