If the product of 1/2 and 2/5 is subtracted from the sum of 1/2 and 2/5 what is the difference

Given the graph below state whether or not the relation is a function, and give the domain and range.

What is the value of p in the equation y^ = -4x?

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?