20 ! the diagrams below (picture attached) represent the first three terms of a sequence.

assuming the pattern continues, which formula determines a(n) , the number of shaded squares in the nth term?

a a(n) = 4n

b a(n) = 8n + 4

c a(n) = 4n +8

d a(n) = 4n + 12

The product of two negative rational numbers is always zero sometimes zero never zero

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.

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?