i need help with the following 2 fraction related questions:
1) determine whether the set of the following is closed for the given operation. Explain why, or why not. [what does it mean by closed?]
a) the set of positive fractions for subtraction.
b) the set of negative fractions for subtraction
c) the set of positive fractions for division
d) the set of positive fractions for multiplication
2) solve the following problem using strategy, or strategies, except algebra
Five jars contain a total of 92 chocolate bars. if each jars contains two more chocolate bars than the previous jar, how many chocolate bars are in each jar?(Hint: the bars can be split)
This is a pretty basic algebra problem. Let "x" be the number of bars in the first jar. Then there are x+ 2 bars in the second jar, x+ 2+ 2= x+ 4 in the third jar, x+ 4+ 2= x+ 6 bars in the fourth jar, and x+ 6+ 2= x+ 8 bars in the fifth jar.
Add those, set the total equal to 92 and solve for x. The "bars can be split" is just to warn you that the solution may not be a whole number.