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DerKrebs [107]
2 years ago
7

What is the length of the altitude of the equilateral triangle below?​

Mathematics
1 answer:
ElenaW [278]2 years ago
5 0

Answer:

A

Step-by-step explanation:

the height a creates with half of the baseline (5) and a leg (10) a right-angled triangle, and we can use Pythagoras to calculate a.

c² = a² + b²

c being the Hypotenuse (the side opposite of the 90° angle, so in our case the 10 side).

10² = a² + 5²

100 = a² + 25

75 = a²

a = sqrt(75) = sqrt(3×25) = 5×sqrt(3)

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What is 200% of 90?<br> Order from least to greatest?<br> 68% 0.63 13/20
Mandarinka [93]

200% of 90 is 180.

13/20=65/100 so

.63 < 13/20 < 68%

4 0
3 years ago
Correct and best answer gets brainliest.
Nuetrik [128]
Im pretty sure the answer is c) 136
4 0
3 years ago
Read 2 more answers
The cost of 3 notebooks and 4 pencils is $8.50. Determine the cost of one notebook and one pencil
Assoli18 [71]
Call the notebooks x, and the pencils y. 
<span>3x + 4y = $8.50 and 5x + 8y = $14.50 </span>
<span>Then just solve as simultaneous equations: </span>
<span>3x + 4y = $8.50 </span>
<span>5x + 8y = $14.50 </span>

<span>5(3x + 4y = 8.5) </span>
<span>3(5x + 8y = 14.5) </span>

<span>15x + 20y = 42.5 </span>
<span>15x + 24y = 43.5 </span>

<span>Think: DASS (Different Add, Similar Subtract). 15x appears in both equations so subtract one equation from the other. Eassier to subtract (15x + 20y = 42.5) from (15x + 24y = 43.5) </span>

<span>(15x + 24y = 43.5) - (15x + 20y = 42.5) = (4y = 1) which means y = 0.25. </span>

<span>Then substitue into equation : </span>
<span>15x + 20y = 42.5 </span>
<span>15x + 5 + 42.5 </span>
<span>15x = 42.5 - 5 = 37.5 </span>
<span>15x = 37.5 </span>
<span>x = 2.5 </span>

<span>15x + 24y = 43.5 </span>
<span>15(2.5) + 24(0.25) </span>
<span>37.5 + 6 = 43.5 </span>

<span>So x (notebooks) are 2.5 ($2.50) each and y (pencils) are 0.25 ($0.25) each.</span>
6 0
3 years ago
97.2
makvit [3.9K]

Answer:

Step-by-step explanation:

x = 774.37(0.972)

x = 752.68764

x = 752.69  km

descending order???? OK... 97652

4 0
2 years ago
Can a positive and negative number be equivalent<br> and plz explain you know it
Sunny_sXe [5.5K]

Answer:

Yes! See explanation below!

Step-by-step explanation:

If a positive and negative number is equivalent, then they are called additive opposites meaning they add up to 0, basically cancelling out.

Ex:

1+-1=0\\1000000+-1000000=0\\\frac{1234}{1234}+-\frac{1234}{1234}=0

4 0
3 years ago
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