The elevation of death valley-282 feet. the mississippi river in illinois has an elevation of 279 feet. which is closer to sea level?

The absolute value of a number tells us how far away from 0 that number is...

death valley : | -282 | = 282so this is 282 spaces from 0
mississippi river : | 279 | = 279...so this is 279 spaces from 0

so the mississippi river is closer to 0 then death valley 

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle