Dr. banks had 330 toothbrushes to give away to his patients.
he gave away 53 toothbrushes in january. he gave away 67
toothbrushes in february. in march he gave away 46
toothbrushes. how many toothbrushes does he have left?

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

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.

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?