Determine if each shape has rotational symmetry- if so how many degrees of a turn will map the figure exactly on top of the original figure?

What is the perimeter of square abcd? units units 28 units 37 units

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics