Show work ! solve the equation by completing the square. if necessary, round to the nearest hundredth.
x^2-18x=19

a. 1; 19
b.-1; 19
c.3; 6
d.-3; 1

solve x^2-81=0

a.0
b.-9
c.-9,9
d.9

Find the quotient. 50a2 – 98b2 -5a +7b

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?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?