T = total cost for music school
L = # of lessons
T = $1,190 + ($40 × L)
T = $1,190 + ($40 × 12)
T. = $1,190 + $480
T = $ 1,670 for 12 lessons
Answer:
8 minutes
Step-by-step explanation:
Since the level of the tank needs to be at two-thirds its original level, then this means that Andrew needs to drain only one-third of the fish tank. Therefore the amount of time it would take can easily be solved with this 2-step equation...
6t = 144 * 
.... first multiply the right side of the equation
6t = 48 ... next divide both sides by 6
t = 8
Finally, we can see that it will take Andrew 8 minutes to drain the tank to two-thirds of its original level.
Answer:
The net, when folded into a cube, has a total surface area of 2,400 sq.units
Step-by-step explanation:
The length of all sides of a cube are the same.
Now, the surface area of a cube is the sum of the area of all of its faces.
Since the length of all sides are the same and we are told that the length of a side is 20 units, thus, the area of one face is;
A = 20 x 20 = 400 sq.units
So, one the area of a face is 400 sq.units.
Now, since all the faces are the same measurement, thus each face will have an area of 400 sq.units. Cubes have 6 faces, thus the total surface Area is;
Total = 400 x 6 = 2400 sq.units
The net, when folded into a cube, has a total surface area of 2,400 sq.units
