I need help wit questions I don’t know what to do ?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

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?