Guys please i need help in this question, whoever gets it right will get a brainliest dont pay attention to the bots responding with links, there not the answers

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?