Help me please? confused

Awater tank holds 18000 gallons. how long will it take for the water level to reach 6000 gallons if the water is used at anaverage rate of 450 gallons per day

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?

You remove a cheesecake from the oven with an ideal internal temperature of 165 f and place it into a 35 f refrigerator. after 10 minutes, the cheesecake has cooled to 15o f if you must wait until the cheesecake has cooled to 70 before you eat it, how long will you have to wait?