Between 2000 and 2010, coal and petroleum production from the fuel- producing countries can be modeled by the following system of equations,
where x = 0 represents the year 2005:
Coal production: y = 93.2x + 3100
Petroleum production: y=-29.1x + 2942
Calculate the
year in which production from both forms of fuel was equal.

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?

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

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /