Answer:
B
Step-by-step explanation:
The screenshot given explains the formula of standard deviation, which measures the variation of numbers in a set.
It basically says we have to find the sum of all the numbers subtracted by the mean squared, and divide that by the number of data sets, and then square root.
The only way we can get this problem is by B.
Answer:
9x^4 + 2x²y² + y^4
Arrange the terms
9x^4 + y^4 + 2x²y²
making the first two terms into a² + b²
(3x²)² + (y²)² + 2x²y²
use the formula of a² + b² = (a+b)² - 2ab
(3x² + y²)² - 2.3x².y² + 2x²y²
(3x² + y²)² - 6x²y² + 2x²y²
(3x² + y²)² - 4x²y²
(3x² + y²)² - (2xy)²
use the formula a² - b²
(3x² + 2xy + y²) (3x² - 2xy + y²)
Step-by-step explanation:
Answer:
D
Step-by-step explanation:
Sam should have bought 3.09 yards of fabric instead of 2.4 yards
So, Option D is correct.
Step-by-step explanation:
Total fabric needed by Sam = 2.75
According to directions on a sewing pattern they say to buy an extra 12.5%
So, extra fabric would be: 12.5% of 2.75
Solving
Now adding 0.343 into 2.75 to get extra fabric quantity:
2.75+0.343
=3.09
Therefore Sam should have bought 3.09 yards of fabric instead of 2.4 yards
So, Option D is correct.
