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3 years ago

Why can a subtraction problem be rewritten as a addition problem without changing the outcome?

Mathematics

1 answer:

Tema [17]3 years ago

8 0

I think it would have to be a problem with a negative number plus and positive number...

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It took 2/3 of an hour to complete her science homework. It took Bethany 3/4 of the amount of time to do her math homework as he

SOVA2 [1]

We know there are 60 minutes in an hour. To find 2/3 of an hour we divide 60/3 to find 1/3 and multiply by 2 so:
60/3 = 20
20*2 = 40 minutes (which is 2/3 of an hour) to do science

We do the same thing with the 40 minutes. To find 1/4 of 40 minutes we divide 40 by 4 and then multiply it by 3 to get 3/4 so:

40/4 = 10
10*3 = 30 minutes

Then subtract the times 40-30 = 10 minutes

It took her 10 more minutes to complete her science homework.

Hope that helps

3 0

3 years ago

You are planning a May camping trip to Denali National Park in Alaska and want to make sure your sleeping bag is warm enough. Th

Goshia [24]

The probability that this bag will be warm enough on a randomly

selected May night at the park is 0.8106 ⇒ answer C

Step-by-step explanation:

You are planning a May camping trip to Denali National Park in Alaska

and want to make sure your sleeping bag is warm enough.

The average low temperature in the park for May follows a normal

distribution

The given is:

1. The mean is 32°F

2. The standard deviation is 8°F

3. One sleeping bag you are considering advertises that it is good for

temperatures down to 25°F (x ≥ 25)

At first let us find the z-score

∵ z = (x - μ)/σ, where x is the score, μ is the mean, σ is standard deviation

∵ μ = 32°F , σ = 8°F , x = 25°F

- Substitute these values in the rule

∴ z = $\frac{25-32}{8}=-0.875$

Now let us find the corresponding area of z-score in the normal

distribution table

∵ The corresponding area of z = -0.875 is 0.18943

∵ For P(x ≥ 25) the area to the right is needed

∵ P(x ≥ 25) = 1 - 0.18943 = 0.8106

∴ P(x ≥ 25) = 0.8106

The probability that this bag will be warm enough on a randomly

selected May night at the park is 0.8106

Learn more:

You can learn more about mean and standard deviation in brainly.com/question/6073431

#LearnwithBrainly

3 0

3 years ago

What would you multiply the dividend and divisor by in the following division problem so that the divisor would become a whole n

horsena [70]

Devisor is the bottom number
hmm

11.75=11 and 3/4
so times it by 4 to clear denomenator
but do it by top and bottom

23.4/11.75 times 4/4=93.6/47

so times it by 4/4

5 0

3 years ago

Read 2 more answers

S.O.S help !!!!!!!!!!!!!!!!

Svetradugi [14.3K]

It means on the 4th day, 88 boats will pass. So the 3rd answer down is correct.

4 0

3 years ago

The mathematics department of a college has 15 male professors, 9 female professors, 6 male teaching assistants, and 12 female t

Vesnalui [34]

Given:

The number of male professors = 15.