Hich is the definition of a line segment? a figure formed by two rays that share a common endpoint
the set of all points in a plane that are a given distance away from a given point
a part of a line that has one endpoint and extends indefinitely in one direction
a part of a line that has two endpoints

Ineed asap. i cant understand this question i need someone to me right away

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'