Matilda sits on her back porch for one hour every morning for a week and records the types and numbers of birds that visit her bird feeder. what kind of study is this? a) double-blind studyb) sample surveyc) experimentd) observational study

depends on how many days you are talking about

step-by-step explanation:

5

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60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.