53. PHYSIOLOGY Scientists determined that the rate y (in calories per minuta at which you use energy while walking can be modeled by
y = 0.00849(x – 90.2)2 + 51.3, 50 < x < 150
where x is your walking speed (in meters per minute). Graph the function on the
given domain. Describe how energy use changes as walking speed increases.
What speed minimizes energy use? Source: Bioenergetics and Growth

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?