Best is to draw a sketch of the three points.
Next step is to find the distances BC, CD, DB.
The perimeter is the sum of the three distances.
The distances are found using the distance formula:
D=sqrt((y2-y1)^2+(x2-x1)^2)
order of (x1,y1), (x2,y2) is not important.
BC=sqrt((3- -3)^2+(5-3)^2)=sqrt(6^2+2^2)=sqrt(40)=5.324
CD=sqrt((-1-3)^2+(0-5)^2)=sqrt(4^2+5^2)=sqrt(41)=6.403
DB=sqrt((-3- -1)^2+(3-0)^2)=sqrt(2^2+3^2)=sqrt(13)=3.606
So perimeter = BC+CD+DB=16.333 (approximately)
It is A because 13/13 (=1) and 13/13 - 8/13 = 5/13
Hope this helped :)
Answer:
I need a pic of his methods to answer
Step-by-step explanation:
Answer:
4Na + 1O2 > 2Na2O
SF6 > 1S + 3F2
2FE2O3 > 4FE + 3O2
Step-by-step explanation:
1. Identify the Products and Reactants(always do O2 last)
2. determine how many atoms of each element are present on each side of the equation
3. Add Coefficients and never change the subscripts. If there's a coefficient in front of any compound, it is distributed to both elements.
4. find the total number of atoms on both sides of the equation and make sure they equal with each other
