ryan can walk to school in 6/15 of a hour he rides his bike and gets there in 8 minutes can ryan get to school quicker by walking or riding his bike? how many times faster?

Which equation represents the partial sum of the geometric series?

This is about circle theorems. someone asap : (

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6