Given equations a and b as 2/5x+y=12 and 5/2y-x=6, respectively, which expression will eliminate variable x?
a.)5/2a+2/5b
b.)5/2a-b
c.)a+2/5b
d.)5/2a-2/5b
e.)25/10a+6/10b

Anull hypothesis states that the difference between 8 hours of sleep and 3 hours of sleep has no effect on the number of pictures a student will remember during a picture memory interface test (pmit). examining the mit database, an extremely small t-value of 0.1611 is found. this t-value is much smaller than the smallest t-value on the chart for p-value reference. from this information we can: select one: a. accept the null hypothesis because the p-value obtained shows that the difference between the two groups being tested is not statistically significant b. accept the null hypothesis because the p-value obtained was statistically significant c. reject the null hypothesis because of the p-value obtained d. reject the null hypothesis because the data obtained is statistically significant