Show me a pic of the problem
I'm sorry to hear your stuck! Let''s learn how to do this.
Simplify both sides of the equation!
−25(10−x)=5x+50
(−25)(10)+(−25)(−x)=5x+50 - Distribute
−250+25x=5x+50
25x−250=5x+50
Now subtract 5x to each side.
25x−250−5x=5x+50−5x
20x−250=50
Add 250 to both sides. (We need to get x by itself)
20x−250+250=50+250
20x=300
Divide both sides by 20!
You get x = 15.
I'd take notes and look through on how this problem was solved for future references.
Have a good one!
Step-by-step explanation:
F and C, I think those are the only ones
Answer:

Step-by-step explanation:
The angle on a straight line is always 180 degrees.
Thus,

Remove the brackets:


Subtract 24 from both sides:


Divide both sides by 12:


Answer:
E. 285
Step-by-step explanation:
The display forms a pyramid with each layer having a square based with one fewer row and one fewer column than the previous layer.
Since the first layer has 81 boxes, it is a 9x9 square. The next layer is an 8x8 square, followed by a 7x7 and so on.
Therefore, the total number of boxes is:

There are 285 boxes in display.