The expression n2 + n represents the total number of blocks used in the nth figure of a pattern. Figure 1 has 2 units. FIgure 2 has 6 units. Figure 3 has 12 units. Use the equation n2 + n = 56 to determine which figure has 56 blocks. Figure has 56 blocks.

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

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.

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box