Solve by the linear combination method (with or without multiplication). 6x + 7y = –4 5x – 3y = –21 a.(3, –1) b.(1, 7) c.(–3, 2) d.(–1, 3)

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.