Answer:
It's the last choice.
Step-by-step explanation:
Difference of 2 squares:
a^2 - b^2 = (a - b)(a + b)
so the answer is (4x - 5y)(4x + 5y) ( = 16x^2 - 25y^2).
Answer: i
Step-by-step explanation:
It is imaginary, since if you try squaring numbers, ex: -1, 1,0,2 you always get a number bigger or equal to 0.
For years mathematicans argued weather the square root of -1 (or any negative number) should exist.
Then one day, a mathematician proposed a soulution, the square root of -1 could be i. Everyone liked that and so now the square root of -1 is i
Answer:
3
Step-by-step explanation:
You substitute the 3, 2 and 7 in for your variables (the letters) and add parentheses ( ) to organize your data and use order of operations (PEDMAS) to solve. So when I did it I but the numbers in (3*3) + (11*2) - (4*7), then solved inside the parentheses to get 9 + 22 - 28 and solved across, 9 + 22 = 31 - 28 = 3. Hope this made sense and helps!
Answer:
36
Step-by-step explanation:
90÷5=18
18×2=36
We multiply two because the ration for adults is 2
Answer:
.4
Step-by-step explanation:
2/5
We want the denominator to be a power of 10
2/5 * 2/2 = 4/10
The decimal is .4