PLEASE HELP ME I NEED THIS TEST DONE ASAP!! (Please show steps if you can)

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Which one ? is the answer and how to find this answer

Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.