The elevation of a tree's root is -13 feet and spans a radius of 8 feet. if the elevation of the tree is 28 feet with branches that span a radius of 12 feet, what is the total length of the tree from root tip to top?

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!