To solve for b, you need to isolate/get the variable "b" by itself in the equation:
A = h(a + b) Divide h on both sides

Subtract a on both sides to get "b" by itself


A)
a+b=180 and a=2(b-30) using this in the first equation gives you:
2(b-30)+b=180
2b-60+b=180
3b-60=180
3b=240
b=80 so a=100
Andre's score was 100 and Brandon's score was 80.
b)
100x-200>50x-75 subtract 50x from both sides
50x-200>-75 add 200 to both sides
50x>125 divide both sides by 50
x>2.5
In order to do this we have to get all the numbers into percent form.
60% = 60%
0.4 = 40%
1/5 = 0.2 = 20%
So, the order from smallest to biggest is 1/5, 0.4, and 60%.