Answer: 
Step-by-step explanation:
1. To find the equation asked, you must add the times:
Where 
is the time takes Lilly in her path to work and 
is the time takes Lilly in her path to home.
2. You must use the following formula of speed and solve for the time
Where n is the distance, V is the speed and t is the time.
3. You know that Lilly takes a train each day to work that averages 35 miles per hour, then, you can write the following expression:
4. And her train ride follows the same path at 45 miles per hour:
5. Then, you obtain the following equation:
Step-by-step explanation:
Add 1 to both sides
Multiply both sides by 4
Take the square root of both sides
Subtract 5 from both sides
(straight from khan academy hints)
78+12 = 90 positive test
not pregnant given positive test 12
12/90
.13
B
Answer:
The large cube will contain 125 total small cubes.
Step-by-step explanation:
In order to find this, we multiply the number of rows by the number of cubes in a row.
5 * 5 = 25
Now we take that number and we multiply it by the number of layers total.
25 * 5 = 125
