- What is the angle b/w vector A=i(cap) and vector B=i-j (cap) ?

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What's the genetic percentage of the offspring if 2 brothers marry 2 girls that are first cousins?The brothers are not related to the girls? How much work must be done on a system to decrease its volume from 10.0 L to 3.0 L by exerting a constant pressure of 4.0 atm? Convertion of liters to cups? A committee of five is to be formed from 5 boys and 4 girls. How many different committees can be formed with at least 3 boys as members? What is the value of :210.0/2.0?keep in mind the rules of significant digits.?