Ac method
for y=ax^2+bx+c
the ac method is normally used for when a≠1
it is used as an aid to help factor
so
0=1x^2-8x+15
multiply a and c (1 times 15=15)
what 2 numbers mulitply to get 15 and add to get -8?
-3 and -5
split the middle up to that
0=1x^2-3x-5x+15
group
0=(x^2-3x)+(-5x+15)
undistribute
0=x(x-3)-5(x-3)
undistribute (x-3)
0=(x-5)(x-3)
set to zero
x-5=0
x=5
x-3=0
x=3
solutions are x= 3 and 5
A=p (1+rt)
A future value ?
p Principle 900
R interest rate 0.06
T time 9/12
A=900×(1+0.06×(9÷12))
A=940.5
Length = 60 feet
Perimeter = 220 feet
There's four sides to a rectangle if one side is 60 then that means there are two sides that 60 because they are opposite each other.
So side A=60 and side B = 60
Now you have two sides left. Add the two sides you have to get 120
Subtract 120 from 220 = 100
Now divide 100 by 2 to get the remainder side lengths which is 50
So side C=50 and side D=50
Area is base times height so in this case it would be 50 times 60 since those are adjacent sides
And your answer is 3000 feet
Hope this helped!
Answer:
duh. 98.33 yeah yeah yeah yeah yeah yeah