The area of a rectangle is the product of its dimensions
The dimensions of the rectangle are:
and 
The area is given as:

Express 125 as 5^3

Apply difference of cubes


The area of a rectangle is:

So, by comparison:


Read more about areas at:
brainly.com/question/3518080
Well if you tell me the distance of abcd from the speaker I could help u
Answer:
10 feet
Step-by-step explanation: thought it was 11 but got it wrong because it’s 10
Area of big rectangle =8x7=56cm²
area of small rectangle =5x4=20cm²
hence area of shaded region=56-20=36cm²