Answer:
To find the area of a circle use the formula: A = π * r^2
r is the radius that is given.
Example: Find the area of a 5 in radius circle
A = π * (5)^2
A = 25π
A = 78.54
Hope this helps :)
Answer:
A=~r
Step-by-step explanation:
Checking with Addition:
Let x, y be two whole numbers.
Then, x + y is definitely a whole number.
So, the set of whole numbers is closed under addition.
Checking with Subtraction:
Let x, y be two whole numbers.
Then, x - y may or may not be a whole number.
For example, if we take 3 and 2,
3 - 2 = 1 is a whole number but if we take 2 and 5, then
2 - 5 = -3 is not a whole number.
So, the set of whole numbers is not closed under subtraction.
Checking with Multiplication:
Let x, y be two whole numbers.
Then, x × y is definitely a whole number.
So, the set of whole numbers is closed under multiplication.
Checking with Division:
Let x, y be two whole numbers.
Then, x / y may or may not be a whole number.
For example, if we take 6 and 3,
6/3 = 2 is a whole number.
But, if we take 4 and 5,
4/5 is not a whole number.
So, the set of whole numbers is not closed under division.
Answer:
10 + 5xy = -80
Step-by-step explanation:
10 + 5xy = ?
x = 9 and y = -2
10 + 5xy = 10 + 5(9)(-2)
= 10 - 90
= -80