How do you solve 3x^6- 39x^4+ 108x^2= 0

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation