There are six essay questions on a history test, lettered a, b, c, d, e, and f. If you can choose any two the six questions to answer, how many different selections can you make?

Me. i can't figure out this question. give an explanation too. .

The total number of dental clinics total for the last 12 months was recorded

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?