The figure shows four forces exerted on a box. if f1 equals 4 n and f3 equals 6 n and the box remains stationary, which statement is correct?
a- f2 equals 6 n and f4 equals 4 n.
b- f2 equals 2 n and f4 equals 10 n.
c- f2 equals 10 n and f4 equals 2 n.
d- f2 equals 4 n and f4 equals 6 n.

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.