Alguien que por favor me ayude con esto, es MUY urgente

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning