Answer:
<h2>9</h2>
Step-by-step explanation:
(-)(-) = (+)
(-)(+) = (-)
(+)(-) = (-)
(+)(+) = (+)
-(-21) = (-)(-21) = (+)21 = 21
-12 - (-21) = -12 + 21 <em>use commutative property: a + b = b + a</em>
= 21 + (-12) = 21 - 12 = 9
The answer is A, let me know if you need an explanation
Answer:
x=3
Step-by-step explanation:
25x+57+x=45x
26x+57=45x
57=19x
x=57/19
x=3
-3(b - 7)
-3*b = -3b
-3*7 = -21
-3b - 21
99 is a composite number. 99 = 1 x 99, 3 x 33, or 9 x 11 :)))
