1. andrew ran a marathon in about 1.56 * 10^4s. (a) write andrew’s time in standard notation. (b) evelyn ran a marathon in 4 h and 16 min. who ran the race in the shorter amount of time? show your work.

Answer-

Evelyn ran the race in the shorter amount of time.

Solution-

Time taken by Andrew to run the marathon is,

Converting this into standard notation, we have to write it in hours and minute form. As 1 hour contains 60 minutes or 3600 seconds, so

This is equivalent to 4 complete hours and one third of an hour. One-third of an hour is equal to   minutes, then

Andrew took 4 hours 20 minutes to complete the marathon, whereas Evelyn took 4 hours 16 minutes, so Evelyn took 4 minutes less than Andrew.

Therefore, Evelyn ran the race in the shorter amount of time.

4.

step-by-step explanation:

it have the same area.brainliest

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,