(WILL MARK BRAINEST)Use the survey results. 40% have a pet now and have had a pet. 60% do not have a pet now. 82% have had a pet
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CosA=(21^2+23^2-25^2)/2*21*23
cosA=345/966
A=cos^-1(345/966)
A=69.08
cosA=345/966
A=cos^-1(345/966)
A=69.08