We know there are 4 suites the deck can be divided into, and two of the 4 are black. So you divide 2/4, and get 1/2. So the probability that a black card will be chosen is 1/2.
Answer:
7
Step-by-step explanation:
10 x 2 = 20
10 - 3 = 6
C. You would first have to divide A by Pi, then take the square root of r, in order to get r by itself.
Answer: 
Step-by-step explanation:
To solve this problem you must apply the proccedure shown below:
- By definition, the perimeter of the figure is the sum of the lenght of each side. Then, you must make the addition as following:

Where
is the perimeter of the figure.
- Add the like terms, then, you obtain the following expression in simplest form:

Answer:
7 rows
Step-by-step explanation:
total 42 tiles. 6 columns mean, each column will have 6 tiles. so to have 42 tiles, 6*7 required