Len estimated the sum of 16.23, 215.7, and 110.3 by rounding each number to the nearest whole. What was Len's estimate and what is the actual sum of the numbers?

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

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?