Which situation is an example of an observational study

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Afarm is to be built in the shape of quadrilateral abcd, as shown below. all four sides are equal. a rhombus abcd is shown with diagonal ac equal to 15.5 feet and diagonal bd equal to 13.2 feet. what is the area of the farm? pleas only pick from the 4 below 62 square feet 52.8 square feet 57.4 square feet 102.3 square feet

5cakes cost 3.50 how much do 7 cakes cost