Sound will travel fastest in air at _____.

15 degrees Celsius

Step-by-step explanation:

Sound travels fastest usually at 25 degrees Celsius when the air is hotter as physics professor Kim strong stated

• correct me if I'm wrong

1031p + £20 , I dont understand what the p stands for but that is it

Step-by-step explanation:

- remove 100 free minutes from 140 from Jim's usage, youre left with 40 minutes at a rate of 9p each minute. 40 x 9 = 360

- remove 200 free texts from 261, youre left with 61 texts at a rate of 11p per text, 61 x 11 = 671

671 + 360 = 1031

1031 + 20

20 for the monthly charge