Here is one example of when you would use the friendly number strategy to subtract.
42 - 18
We will turn the 18 into a friendly number, which is going to be 20.
(42 + 2) - (18 + 3)
44 - 20
Now it is easier to subtract 44 - 20 than it is 42 -18. With 42 - 18 we would have to barrow whereas with 44 -20 we do not have to barrow and we can do it in our head easier and makes it faster.
Answer:
A = (a+b)/2
G = sqrt(ab)
Step-by-step explanation:
To find the arithmetic mean, we add the numbers together, then divide by how many numbers
A = (a+b)/2
To find the geometric mean, we multiply the numbers and take the nth root
G = (ab) ^ 1/2
G = sqrt(ab)
Answer: 60.01
Step-by-step explanation:
Answer: Option C
Step-by-step explanation:
To solve this problem use the properties of the logarithms.
We know that the inverse function of 
is 
.
So when composing the function with its inverse function we have to:
.
Now apply this property on both sides of the equation
the answer is the option C
