PLS HELP

Which of the following is not a valid conversion factor?

1 meter/100 centimeters
1mL/1 cm3
1 kilometer/1000 Meters
1 meter/10 millimeters

(-9,7), (6,2) write an equation in point-slope form of the line that passes through the given points, then write the equation in slope-intercept form

The graph and table shows the relationship between y, the number of words jean has typed for her essay and x, the number of minutes she has been typing on the computer. according to the line of best fit, about how many words will jean have typed when she completes 60 minutes of typing? 2,500 2,750 3,000 3,250

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