Let a represent a positive number and let b represent a negative number. Which statements are true? The difference (a-b) could be negative.

The difference (b-a) cannot be negative.

The difference (b-a) cannot be positive.

The sum (a+b) could be positive.

The sum (b+a) could be negative.

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?