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3 years ago

Using a property of operations, what can you say about the sums of (-13.2) + 8.1 and 13.2 + (-8.1)

Mathematics

1 answer:

Wewaii [24]3 years ago

4 0

They are opposites of each other.
-13.2 + 8.1 = -5.1
13.2 - 8.1 = 5.1

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108 identical books have a mass of 30 kg. Find

Lynna [10]

Answer:

(i) 540kg

(ii) 5.56 (rounded off to 3 significant figures)

Step-by-step explanation:

$108 \div 30 = 3.6kg$

$(i)3.6 \times 150 = 540kg$

$(ii)3.6 \times x = 20$

$3.6x = 20$

$x = \frac{20}{3.6}$

$x = 5 \frac{5}{9}$

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3 years ago

If 9 is p present of 17 then p is a number between

Pepsi [2]

Answer:

40% and 60%

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Step-by-step explanation:

60% of 17 is 10.2 making 40% and 60% the closest choice to 9

So, the answer would be 40% and 60%

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3 years ago

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If you were constructing a TRIANGULAR FRAME, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a

klemol [59]

Answer:

Yes

Step-by-step explanation:

In order to make a triangle with non-zero area, the sum of the shorter two sides must be greater than the longest side.

Here, 4 + 4 > 7, so the lengths can form a triangle.

8 0

3 years ago

What must happen for historians to consider a particular time in a civilzation a classical period?

Ksivusya [100]

The correct answer of the given question above would be option D. The thing that must happen for historians to consider a particular time in a civilization as a classical period is that, the civilization must make extraordinary achievements in areas such as art and science.

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3 years ago

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In a large school, it was found that 71% of students are taking a math class, 77% of student are taking an English class, and 58

Anni [7]

Answer:

P (Math or English) = 0.90

Step-by-step explanation:

* Lets study the meaning of or , and on probability

- The use of the word or means that you are calculating the probability

that either event A or event B happened

- Both events do not have to happen

- The use of the word and, means that both event A and B have to

happened

* The addition rules are:

# P(A or B) = P(A) + P(B) ⇒ mutually exclusive (events cannot happen

at the same time)

# P(A or B) = P(A) + P(B) - P(A and B) ⇒ non-mutually exclusive (if they

have at least one outcome in common)

- The union is written as A ∪ B or “A or B”.

- The Both is written as A ∩ B or “A and B”

* Lets solve the question

- The probability of taking Math class 71%

- The probability of taking English class 77%

- The probability of taking both classes is 58%

∵ P(Math) = 71% = 0.71

∵ P(English) = 77% = 0.77

∵ P(Math and English) = 58% = 0.58

- To find P(Math or English) use the rule of non-mutually exclusive

∵ P(A or B) = P(A) + P(B) - P(A and B)

∴ P(Math or English) = P(Math) + P(English) - P(Math and English)

- Lets substitute the values of P(Math) , P(English) , P(Math and English)

in the rule

∵ P(Math or English) = 0.71 + 0.77 - 0.58 ⇒ simplify

∴ P(Math or English) = 0.90

* P(Math or English) = 0.90

8 0

3 years ago