Answer:
1) -9
2) 9
3) 100
4) -63
5) 24
6) 2
7) 3
8) 5 - 2
9) 5 + 10
10) 8
11) 3
12) 6
13) Not sure what (64 8) 2 = is.. so. Options:
(64 + 8) 2 = 144
(64 - 8)2 = 112
(648)2= 1296
(64) (8) (2) = 1024
14) 10
15) 550
16) 600
17) -25
18) -30
19) 6, if that's a variable than 6x.
20) 12, if that's a variable than 12x.
Explanation:
1) negative x positive = negative.
2) Negative x negative = positive.
3) positive x positive = you guessed it, positive.
4) positive x negative = negative.
5) There's two negatives and one positive. Even though negatives overpower the positives, the answer is positive. This is because when we simplify the answer down, we'll be left with the equation: negative x negative.
-2 * 3 * -4
-2 * 3 = -6
-6 * -4 = 24.
6) got too lazy :D