D 3.573 is the correct answer!
Answer:
Step-by-step explanation:
1). (B). Replace one equation with the sum/difference of both equation.
System B is
- 4x - 6y = 9 ........ <em>(1B)</em>
-4x + 3x = - x
- 6y + y = - 5y
9 - 4 = 5
- x - 5y = 5 ........ <em>(2B)</em>
2). Yes, both system are equivalent.
Answer:
f(n+1) = f(n) - 5
Step-by-step explanation:
Just find some relationship between 2 numbers that are next to each other.
Answer:
x=20
Step-by-step explanation:
Because all angles of a triangle add up to 180, by adding all the values that your given and setting it equal to 180, you get the value of x.
3x+2x+20+4x-20=180
9x=180
x=20