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enyata [817]
3 years ago
14

Which expression is equivalent to 21 × 7?

Mathematics
2 answers:
Crank3 years ago
5 0
The answer would be A) because they both have the same result answer.
Marina CMI [18]3 years ago
5 0

Answer:

a

Step-by-step explanation:

they both have the problem and the answer to a are equal

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The area of a rectangle is 108 m2 and its diagonal is 15 m. Find
Andre45 [30]

Answer:

47.6m.

Step by step solution:

Perimeter of a triangle = base + 2 . length____(1)

Area of a triangle = 1/2 . base . diagonal

108 = 1/2 . base . 15

multiplying both sides by 2:

216 = 15 . base

dividing both sides by 15:

base = 14.4m

But the diagonal divides the triangle into two

right angle triangles each with the same length (hypotenuse),base and diagonal(height).

Taking one right angle triangle:

And using pythagoras theorem;

length² = base² + diagonal ²

length² = 7.2² + 15²

Note: Base of each right angle triangle is 7.2 which would sum up to be 14.4 the base of the full triangle.

length² = 276.84

taking the square root of both sides:

length = 16.6m

Putting the values of the base and length into equation (1).

Perimeter of the triangle = 14.4 + 2 . 16.6

Note: We are dealing with the whole triangle

now hence the base is 14.4m.

Perimeter of the triangle = 14.4 + 33.2 = 47.6m.

6 0
3 years ago
Read 2 more answers
Between 6 a.m. and 10 a.m. the temperature rose by 5°F. Between 10 a.m. and 2 p.m. the temperature rose by 6°F. Between 2 p.m. a
Vika [28.1K]

Answer:

So the total increase is 15C

Step-by-step explanation:

Yes, we can able to know the temperature difference from 6 AM to 6 PM.

We need to convert all the temperature into one unit.

6 AM - 10 AM ---> 5 F = -15 C

10 AM - 2 PM ---> 6 F = -14.44 C

2 PM - 6 PM ---> 0 C.

So the total increase is 15C

hope this helped :)

4 0
3 years ago
What is the conversion factor to convert kilometers to miles?
GREYUIT [131]

Answer:

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mile = kilometer * 0.621371

Step-by-step explanation:

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3 years ago
9. (12 pts) daniel is paying $600 for his auto insurance, and he is wondering if he is overpaying compared to his friends. he se
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Answer:

Step-by-step explanation:

1) The sample and the population of this study is the friends who replied his email which includes in his contact list. then, the number of the replied to his email are 9 friends.

population: the whole friends include in his contact list.

3) Type I error occurs when one incorrectly rejects the null hypothesis

Here there is possibility of type I error

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4 years ago
A jewelry shop is offering a percent discount on the original price of a jade pendant. The original price of the pendant was $20
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Answer:

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Step-by-step explanation:

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