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3 years ago

Find the exact area of an equilateral triangle if the length of one side is 40

1 answer:

8 0

Equilateral triangle is a triangle with the 3 sides of the same length, and the 3 angles with the same measures/degree.
The formula to find the area of a triangle is base x height/2 , you do have the base (40), but you need the height. To find the height of an equilateral triangle you use the formula: side/2 x radical3, this way u'll find the height and therefor can calculate the area of the triangle.
Hope that helped :)

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What is the value of n in the equation 1/2(n-4)-3=3-(2n+3) ?

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Answer:

Step-by-step explanation:

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3 years ago

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What is the sum of the first 30 terms of this arithmetic sequence?<br><br> 6, 13, 20, 27, 34, …

masya89 [10]

Answer:

3225

Step-by-step explanation:

The sum to n terms of an arithmetic sequence is

$S_{n}$ = $\frac{n}{2}$ [ 2a + (n - 1)d ]

where a is the first term and d the common difference

here a = 6 and

d = 13 - 6 = 20 - 13 = 7, hence

$S_{30}$ = $\frac{30}{2}$ [ (2 × 6) + (29 × 7) ]

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3 years ago

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11,23 mi

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Find the value of B - A if the graph of Ax + By = 3 passes through the point (-7,2), and is parallel to the graph of x + 3y = -5

Gnoma [55]

The required simplified value of B - A = -6.

<h3>What is simplification?</h3>

The process in mathematics to operate and interpret the function to make the function simple or more understandable is called simplifying and the process is called simplification.

Since, line Ax + By = 3 and x + 3y = -5 are parallel than slope of both the line will be same,
m = -1/3 = -A/B
From above
A = B/3 - - - - -(1)

Now line Ax + By = 3 passed through the point (-7, 2). So,
-7A + 2B = 3
from equation 1
-7B/3 + 2B = 3
-B/3 = 3
B = -9
Now put B in equation 1
A = -9 / 3
A = -3

Here,
B - A = -9 + 3 = -6

Thus, the required simplified value of B - A = -6.

Learn more about simplification here: brainly.com/question/12501526

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2 years ago

How is solving 2x+c=d similar to solving 2x+1=9 for x? How are they different? How can you use x+c=d to solve 2x+1=9?

valentinak56 [21]

Answer:

Step-by-step explanation:

We can't use 2x + c = d for solving 2x + 1 = 9 . Here we can find the value of x from 2x + 1 = 9.

$2x + 1 =9\\=>2x=9-1\\=>2x=8\\=>x=4$

Putting the value of x in 2x + c = d :-

$2x+c=d\\=>2*4+c=d\\=>8+c=d$

But still we don't know the exact value of c & d . If in the question at least we could have got one exact value of either c or d , then we could find out the value of other variable.

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4 years ago