Hello! So I understood your question as what M means. M is 49, 49-28=21
Here we can first find the area of yard and then subtract the area of vegetable garden to get the required area.
The formula to find area is given by:

Now we find area of yard:
length is 25 ft and width is 15 ft.

Area of yard = 375 ft²
Area of vegetable garden:
length = 8ft and width =8ft
So the vegetable garden is a square.
Area = 8*8
Area of vegetable garden =64 ft²
Area of backyard to be laid with grass = Area of yard-Area of vegetable garden
Area required = 375 -64 = 311 ft²
Answer : The area of backyard in which grass is to be laid is 311 square feet.
D.68
A squared plus b squared equals c squared and so add the two lengths given and square them which gives you the hypotenuse squared so then find the square root of your result which is 68
Answer:

Step-by-step explanation:

Your answer is A
hope this helped
to get this answer you multiply 475 by 1.75% and then you get 8.31