Farm joe ordered 3 bags of soil last month. each bag weighed 4 2/5 kilograms. he used the first bag in a week. at the end of this month, there were 2 3/4 kilgrams of soil left in the second bag and 7/8 kilogram of soil left in the third bag. how much soil was used in this month?

9 23/40 kg

Step-by-step explanation:

The three bags ordered weighed a total of

... 3 × 4 2/5 = 12 6/5 = 13 1/5 . . . kg

The amount remaining at the end of the month was

... 2 3/4 + 7/8 = 2 6/8 + 7/8 = 2 13/8 = 3 5/8 . . . kg

The difference is the amount used.

... 13 1/5 - 3 5/8 = (13 -3) + (1/5 -5/8) = 10 + (1*8 -5*5)/(5*8)

... = 10 - 17/40

... = 9 23/40 . . . kg

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The sum or difference of fractions can always be computed from ...

... a/b ± c/d = (ad ± bc)/(bd)

In this case, bd = 5·8 = 40 is the least common denominator.

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A calculator will often handle problems like this very nicely.

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.