If Martin scored a 77 and an 83 on his last two quizzes, what was his quiz average

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?