Let ABC be a triangle, D, E, F are respectively the midpoints of the sides BC, CA, AB. A parallel passage through A and parallel to BC intersects the rays DE ,DF respectively at the points M, N. a/ prove that MN=BC
b/ Prove that A is the midpoint of MN

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Write the expression as a single natural logarithm. 2 in a - 4 in y

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?