2g 1b because there's 2 girls and 1 boy
The stem and leaf diagram is shown below
There are a total of 48 data
Question a:
The frequency in the stem for 9 to 9.9 is 13 data
Question b:
The location of the first quartile is given by

, where 'n' is the number of data
We have n = 48
Location of the first quartile is at

rounded down to 12
The value of the lower quartile is on the

on the diagram which is 8.7
45 miles per hour divided by 60 minutes is .75 miles a minute.10 miles divided by .75 is 13.33 minutes rounded to 13
50 miles per hour divided by 60 minutes is .83 miles per minute.10 miles divided by .83 is 12.04 minutes rounded to 12
13 - 12 = 1 more minutes
31
just substitute -8 for all x
process here:
f(x) = -3x + 7
f(-8)= -3(-8) + 7