What is the answer to 5+8 this equation?

1+4=.5
2+5=12
3+6=21
5+8=

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x,and the distance in miles, y, that he travels.

Change negative exponents to positive. then solve. round to four decimal places