I’m having a hard time anyone knows??

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.