Pls help I will mark you as brainliest!

Step-by-step explanation:

Let say x the amount of the first bill,

2x the second,

2x-500 the third

x+2x+2x-500=8000

5x-500=8000

5x=8000+500

5x=8500

x=1700

2x=3400

2x-500=2900

Proof: 1700+3400+2900=8000

(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

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half