Wich is bigger three fourths of 28 or two fourths of 28?

Find the value of the cosine for angle a

If 1 is divided by the sum of y& 4. the result is equal to 3 divided by 4 .find the value of m?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm