A sound engineer is positioning a cardioid microphone for a music concert. Which equation corresponds to a microphone facing the correct direction? O r = -4 + 4 sin(0) O r = 4 - 4 sin(0) O r = -4 + cos(0) Acos Or = 4 - 4 cos(0)

Asap will give brainliest and a lot of points

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.