Answer:
and
Step-by-step explanation:
Options
Required
Select the unit rates
Unit rate involve two items where the first item being measured can be any positive number, but the second item must be measured in units (i.e. 1)
For clarity:
If represents unit rate, then
Having said that:
Only and
satisfy the condition of unit rates; others are not because they have a denominator other than 1
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.
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Answer:
-4
Step-by-step explanation:
<em>Factor by the numbers from left to right.</em>
<em></em>
<em></em>
<em></em>
<em>It changes to positive to negative.</em>
<em>-4</em>
<em>-4 is the correct answer.</em>