Answer:
<h2> 21 km </h2>
Step-by-step explanation:
If the bicyclist travels 7 km for every 5 minutes then it is directly proportional
5 min 7 km
15 min x
Subtracting by 1 is the rate of change represented
Answer:
she loses 40% I think
Step-by-step explanation:
1/4=20% loss
3/4=60% loss
she gains 20%
60%-20%=40%
You can solve this by substitution.
x+y=10
x-y=4
===== add the equations
2x=14
x=7
Then plug in x into one of the equations
7+y=10
y=3
so x^2=7*7=49
y^2=3*3=9
Hope that helps!