When you cant simplyfy it anymore
100% of the price = $400
x % of the price = $320
we need to find x
using a proportion
100 : 400 = x : 320
100 * 320 = 400 * x
32000 = 400x
x = 32000 / 400
x = 80
That means the new price is 80% of the previous price.
100% - 80% = 20%
and based on this we can make a conclusion that the discount was 20%
I hope it is clear to you, feel free to ask anything about it :)
Step 1: Find X
3x + 7 + 9x + 17
Add the alike terms: 12x + 24
Linear is 180 degree, 12x + 24 = 180; now find x
X = 13
Now find the degree for both.
RST: 3 (13) + 7 = 46
VST: 9 (13) + 17 = 134
You're answer is A
Each time the number is being multiplied by -2 so you could describe the set of number as a geometric sequence.
We have a linear function 
and we know that 
