write 4R+9U in polar form

Answer 1

do you mean 4 right and 9 up?
Like 4 i + 9 j
if so
r = sqrt (16 + 81) = sqrt (97)
angle above x axis is theta
theta = tan^-1 (9/4)

Answer 2

@Damon Yes, 4R means go four to the right (because its positive) and 9U means go nine up from the four (because 9 is positive)

Answer 3

strangest notation I ever saw ...