How do i enlarge it to a scale of 1: 2? what does that mean?

Atriangle has side lengths of 15 inches and 30 inches. it also has angles that measure 45º and 20º. which of the following identifies the possible third angle of the triangle? a. 15 in., 65º b. 45 in., 65º c. 17 in., 115º d. 14 in., 115º

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?