List all pairs of numbers that would have 20 as their lcm

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

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?

Zahra runs a 500-meter race at a constant speed. which graph shows her distance from the finish line during the race?