Janae was vacuuming the narrow hallway in her house. she went 5 feet forwards in the first 4 seconds, then went 3 feet backwards in the next 4 seconds. she continued to do this, forwards 5 feet in 4 seconds and backwards 3 feet in 4 seconds. if she continues in this way, how many seconds will it take her to reach the end of her hallway, which is 15 feet long? 1.

60 seconds

Step-by-step explanation:

Hi!

After she goes forward 5 feet (4 seconds), and the backwards 3 feet (another 4 seconds), the total distance forward she travelled is 2 feet. Then, she moved forward 2 feet in 8 seconds.

Then, as this is repeated, she moves forward 2 feet every 8 seconds. After 7 repetitions she travelled 14 feet, and 56 seconds elapsed. Then she goes forward 5 feet in 4 seconds, and she finaly reaches  the end of the hallway

(14 +5 > 15)

So, in 60 seconds she reached the end of the hallway.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.