Select all the figures with 180° rotation symmetry. A. image A: right, isosceles triangle

B. Image B: rectangle

C. Image C: square

D. Image D: regular pentagon

E. Image E: regular hexagon

plz help me

A figure with a rotation symmetry will look the same, when rotated. The figures with rotation symmetry are:

B: rectangle

C: square  

E: regular hexagon

For a shape to have a rotation symmetry, the following must be true.

Options (a) and (d) do not meet any of the above conditions.

However, the stated conditions are true for options (b), (c) and (e); because they have parallel & equal opposite sides; and they have an even number of sides.

Hence, the rectangle, the square and the regular hexagon have a rotation symmetry

See attachment for an illustration of rotation symmetry.

Read more about rotation symmetry at:

link

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.