Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!
Step-by-step explanation:
we use side of triangle to find area and divide by 2 so first one is 15*15+ 8*15/2 225+60=285
What are you supposed to be doing
-4x + 12
2(x+6)-6x
2x + 12 - 6x
combine llike terms
2x - 6x = -4x
Im to lazy to calculate the entire answer but its basically the formula is a*b/2
