Sandra ran 7/12 of a mile lamar ran 3/4 a mile who ran farther explain pls

Germaine walks at the rate of 10 feet every five seconds while nolan walks at the rate of 15 feet every five seconds. if germaine has a head start of 25 feet, how many seconds will they be at the same spot?

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

Which is an x-intercept of the graphed function? (0, 4) (–1, 0) (4, 0) (0, –1)