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Kisachek [45]
3 years ago
6

Shelly can cut a lawn with a riding mower in 2 hours less time than it takes William to cut the lawn with a push mower. if they

can cut the lawn in 5 hours working together find how long to the nearest tenth of an hour it takes for William to cut the lawn alone.
Mathematics
1 answer:
Veseljchak [2.6K]3 years ago
5 0
Its 3 becuse shelly can cut a lawn in 2 hours and 2 + 3 = 5
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Which set is closed under subtractionWhich answer choice shows that the set of irrational numbers is not closed under addition
vovikov84 [41]

Answer:

(a) Set of rational numbers

(b) \pi + (-\pi) = 0

Step-by-step explanation:

Solving (a): Set that is closed under subtraction

The solution to this is rational numbers.

For a set of number to be closed under subtraction, the following condition must be true

a -b = c

Where

a, b, c are of the same set.

The above is only true for rational numbers.

e.g.

1 - 2 = -1

5 - 5 = 0

\frac{1}{2} - \frac{1}{4} = \frac{1}{2}

4 - 2 = 2

The operations and the result in the above samples are rational numbers.

Solving (b): Choice not close under addition[See attachment for options]

As stated in (a)

For a set of number to be closed under subtraction, the following condition must be true

a -b = c

Where

a, b, c are of the same set.

In the given options (a) to (d), only

\pi + (-\pi) = 0 is not close under addition because:

\pi is irrational while 0 is rational

<em>In other words, they belong to different set</em>

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2 years ago
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nalin [4]

Answer:

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Step-by-step explanation:

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