(5,2),(-7,r) m=5/6. Help me figure this out please! (steps encouraged!)

Can someone answer this question? : )

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?