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3 years ago

Please help.I really don’t understand this..

Mathematics

2 answers:

Aneli [31]3 years ago

8 0

I have included the answer in the picture attached below:

Zinaida [17]3 years ago

5 0

Judging by the model given you will have five different area solving equations.

The first equation I would work on would be the upper left hand triangle, to solve the area of this section you need to first realize that the equation for finding the area of a triangle is (WxL)÷2.
However, you are missing one side length from the triangle. You can figure out this side length by noticing that the rectangle next to it has one length of 13 and one of 9, so 13-9 would give you the sum of 4, which is the missing side length.
Therefore, the equation would be (9x4)÷2, which if solved should result in 16 square cm.

Next I would work on the 9x8 rectangle next to the previous shape. The equation for this will be 9x8, which would result in 72 being the product.

Following that shape is another triangle, being the same as the previous one should result in the product of 16.

Next I would work on the 9x9 square beneath the 9x8 rectangle. The product of this should result in 81.

Lastly, the 12x9 triangle's product should result in 54.

Now you should add all of these products up!
The sum from this I got was 239.

Hope this helped!

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Which of the following is not approximately equivalent to one of the metric units: 1 kilometer, 1 meter, 1 kilogram, or 1 liter?

Nikitich [7]

A.
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Therefore
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b.
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c.
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Answer:
1 pound is not approximately equivalent to one of the metric units.

5 0

3 years ago

Please help and explain ( Brainliest for answer!)

Novosadov [1.4K]

Answer:

AD = 3

Step-by-step explanation:

Pythagoras theorem formula: a² + b² = c² (c being the hypotenuse, the longest side of the triangle).

Using this formula, you can easily say that c²-b²=a². c=5, b=4, making the equation 5² - 4² = a ².

Expanding the formula, you'll get 25 - 16 = a².

25 - 16 = 9.

This means that 9 = a².

To find a, you need to root 9. Using a calculator, you'll know that this number is 3, meaning that AD = 3.

7 0

3 years ago

Triple a number, x, increased by 1 is between -20 and 10. What are the solutions for x?

Bumek [7]

Hello,
$-20 \leq 3x+1 \leq 10\\
\Rightarrow\ -21 \leq 3x \leq 9\\
\Rightarrow\ -7 \leq x \leq 3\\

Sol=[-7\ 3]\ if\ x\ is\ a\ real.
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3 years ago

Find the x-values that are solutions of the equation 5cot^2x-15=0

julia-pushkina [17]

First solve for the trig function 'cot'
$cot^2 x = \frac{15}{5} = 3$

Next take the sqrt of both sides (include plus/minus)
$cot x = \pm \sqrt{3}$

Now take reciprocal of both sides, this will change trig function to 'tan'
(cot = 1/tan)

$tan x = \pm \frac{1}{\sqrt{3}} = \pm \frac{\sqrt{3}}{3}$

Finally use the unit circle or inverse tan on your calculator to find x.
There will be 4 solutions, one for each quadrant.

$x = \frac{\pi}{6}, \frac{5\pi}{6}, \frac{7\pi}{6}, \frac{11\pi}{6}$

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3 years ago

Each pair of polygons below is similar. Find the value of x. Some answers may be decimals.

sergiy2304 [10]

Answer:

The answer to your question is below.

Step-by-step explanation:

14.- Use proportions to solve these problems.

$\frac{x + 6}{10} = \frac{x + 9}{14}$

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14x + 84 = 10x + 90

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x = 5

7 0

3 years ago

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