Answer: If you sit down and hold your breath you can try to hold it in for a little while more?? If you're standing- awooga rip
[1] 0.25, 0.25%, or 
We will divide the number of wanted outcomes by possible outcomes.

[2]
We will follow the same steps as problem 1.
MTHMTCS = 7 consonants
AEAI = 4 vowels
MTHEMTICS = 9 letters that are not A's
MATHEMATICS = total of 11 letters
(a)

(b)

(c)

[3] 0.877
If the probability that a television is defective is 0.123, then the probability that a television is not defective is:
1 - 0.123 = 0.877
Base x height x length
the first one if not the fourth
To determine the number of cubes he needs to fill the box (this is assuming the cubes are 1 in cubes, he would need to calculate the volume of the box. To find the volume he would multiply the length by the width by the height. This would be 5 in x 6 in x 7 in. The volume is 210 cubic inches, so he could fill it with 210 one inch cubes.
Explanation is in the file
tinyurl.com/wpazsebu