Tyler can shovel the driveway in 2 hours. dakota can complete the job in 90 minutes. if they work together, how long will it take

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

In which quadrant does the point lie? write the coordinates of the point. a. quadrant ii; (–2, –4) b. quadrant iii; (2, 4) c. quadrant iii; (–2, –4) d. quadrant iv; (–4, –2)

Me d is also an option but i couldn't get it in the picture