According to exponent rules, when we divide powers we The exponent

The quotient rule for exponents states that if we divide exponents with the same base, then we can subtract the exponents and keep the base unchanged. The exponents have the same base so we can apply the quotient rule and rewrite the given expression

the probability that it will be either red or blue is 7/9

Step-by-step explanation:

There are 9 disks altogether.  Since there are 4 red disks, the probability that a red disk will be drawn is 4/9.  The probability that a blue disk will be drawn is 3/9.  These two events are independent of one another.

The probability that it will be either red or blue is that of the union of the two events.  Thus, we add together 4/9 and 3/9, obtaining 7/9