Decide if a triangle is possible with the lengths of sides given. Please help! DUE TODAY!! Big part of grade!

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

The area of a square floor on a scale drawing is 64 square centimeters, and the scale drawing is 1 centimeter: 3 ft. what is the area of the actual floor? what is the ratio of the area in the drawing to the actual area? the area of the actual floor is square feet. the ratio of the area in the drawing to the actual area is 1 square centimeter: square feet.