Julio watched a movie that started at 11:30 a. m. And it ends at 2:12 p. m. how long was the movie ?

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36