Answer:
-24 degrees Celsius
Step-by-step explanation:
6 x -4 = -24
The sister catches up Jeff after 2 hours
Step-by-step explanation:
We can write Jeff's position and his sister position at time t using the following expressions:
- Jeff position:

where:
7 is the initial position of Jeff when his sister sarts chasing him
2.5 is Jeff's velocity (in miles/hour), so its position increases by 2.5 miles for each hour
t is the time measured in hours
- Sister position:

where
6 is the sister velocity (her position increases by 6 miles for every hour)
t is the time measured in hours
The sister catches up Jeff when the two positions are equal, so

And solving for t,

So, the sister catches Jeff after 2 hours.
Learn more about speed:
brainly.com/question/8893949
#LearnwithBrainly
1 kilo gram is 1000 grams. 1 gram is 1000 milligrams. Think you can solve the rest? :)
Because that way you can find the answer when you are given a large amount of information and you don't have to guess until you get the answer right.