This looks like the additive inverse property, because when you add something to its negative counterpart (or its additive inverse), you get 0 as a sum.
Another example would be 2+ (-2) = 0. -2 is the additive inverse for 2.
b=145 degrees (corresponding angles)
a+145= 180 (straight angles)
a = 180-145
a =35
2x+5x-4=31
7x-4=31
7x=35
X=5
ST=5x-4= 5.5-4=25-4=21
Answer:
n = 14/3 or 4 2/3
Step-by-step explanation:
n = a number
5n/(7+n) = 2
cross-multiply to get:
5n = 2(7+n)
5n = 14 + 2n
3n = 14
n = 14/3 or 4 2/3
