Simplify the expression.
-20a-2b-7
5a-5b3

Step-by-step explanation:

Step 1: Write out the expression separately. Like so:

-20                              5  

Step 2: Since the it's a fraction were dividing. The bases of the exponents are the same, so you can divide the numbers and subtract the exponents.

-20  ÷  5 = -4    

 -   =

-      =

Step 3: Notice that there is a negative exponent. To get rid of the negative, you have to make it positive and move it from being the numerator to being the denominator.

→→→

Step 4: Rewrite the expression with the -4, , and .

hope this helps  :)

a - base

b - exponent

so,

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.