PLEASE HELP ASAP
Add the complex numbers: (4 + 8i) + (–2 – i)

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Determine domain and range, largest open interval, and intervals which function is continuous.

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?