B SUMMER 2021 Helena uses a free online account to store digital photos and videos. She uploads 650 photo and video files from her
phone to the account. The average size of each photo is 4 megabytes and the average size of each video is 9
megabytes. The total upload size was 2,925 megabytes. Which system of equations can be used to determine the
number of photo files, p, and the number of video files, v, Helena uploaded from her phone?

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?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15

If sin(x) = 0 and cos(x) = 1, what is tan(x)?