Suppose S is a nonempty bounded set and let m = supS. Prove or give a counterexample: m is a boundary point of S

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

James is playing his favorite game at the arcade. after playing the game 33 times, he has 88 tokens remaining. he initially had 2020 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

Solve for x where 0 equation: cot^2x+2cotx+1=0