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

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Uestion 1(multiple choice worth 5 points) (05.02)alex wants to paint one side of his skateboard ramp with glow-in-the-dark paint, but he needs to know how much area he is painting. calculate the area of the isosceles trapezoid. isosceles trapezoid with top base 12 feet, bottom base of 18 feet, and height of 6 feet. 72 ft2 84 ft2 90 ft2 108 ft2