In the lcm of 3a^2b^4c^5 and 7a4bc^2 what is the exponent on the b? 1, 4, 5, 6

I'm so close to finishing all these.

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m