Answer:
y=4 or, Jane builds 4 swings in 10 days.
Step-by-step explanation:
In this problem we have some given information:
x= time to build swings
y=number of swings built
We also know the equation that represents this problem is a rate of 0.4x or:
y=0.4x
Now, to solve, since we are determining how many swings (y) in 10 days (the time, x) We plug in 10 for x.
y = 0.4(10)
Solve the equation by multiplying:
.4 x 10 = 4
This leaves us with:
y = 4