The baldwin family walked four over five of a mile in four over nine of an hour. what is their unit rate in miles per hour?

So walked 4/5 mile in a 4/9 h  so just use the rule of 3 simple 

60 minutes 1 hour
x min. 4/9 h

x = 4/9 *60/1 = 240/9 =  26,6 min. 

4/5 mile in 26,6 min.
1 mile   x min.

x = 1*26,6/(4/5) = 26,6 /(0,8) = 33,25 min. 

1 mile 33,25 min.
x miles 60 min.

 x = 60/33,25 = 1,8 miles 

so their unit rate in miles per hour will be 1,8 miles / hour 

hope this will help you 

So first off, lets start off with what we know:

The total sum of the angles in a triangle is always 180 degrees.

Angle A = 60 degrees. (They told us so in the picture!)

That means that:

Angle B + C = (x + 20) + 3x

And B + C = 180 - 60 = 120 degrees.

Therefore (x + 20) + 3x = 120 degrees.

So it follows that if we simplify we get:

4x + 20 = 120 degrees

4x + 20 - 20 = 120 - 20

4x = 100 degrees

x = 25 degrees.

Then we know that:

B = 3x = 3 * 25 = 75 degrees.

And:

C = x + 20 = 25 + 20 = 45 degrees.

We can check by doing:

95 + 75 + 60 = 180 degrees!

So we have solved the problem.