Prove that: 1 - cos 2Θ is identical to: tanΘsinA

where A is an expression to be found.
what is the value for A

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Olga used 100 ounces of flour to make 225 muffins. how many ounces of flour will be used to make 300 muffins?

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.