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in each scenario, represent the problem with an equation and answer the question.

9) on saturday, the temperature started at -7°c. by midnight, the temperature was 6°c. how much did the temperature change?

a. equation:

b. change in temperature:

10) on sunday, the temperature started at -10°c. by evening, the temperature was -2°c. how much did the temperature change?

equation:

change in temperature:

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?