There are two answers to this.
1) We evaluate from left-to-right. 10+10=20, 20x2=40.
2) We use the Order of Operations. Multiplication comes before addition. 10x2=20, 20+10=30.
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a negative times a positive is a negative so 2*-4=-8+10=2
17
2x2 + 9x + 10
9 - 6 + 7 + (2 x 10) = 30
The answer to -1 times 2 plus 3 times 4 equals 10. This is considered to be a math problem.