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3 years ago

12

(a-b)-(a+b) = ayuda pli s

1 answer:

Xelga [282]3 years ago

7 0

(a - b) - (a + b)

= a - b - a - b

= - b - b

= - 2b

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Anuta_ua [19.1K]

Answer

<u>2</u><u>.</u><u>5</u><u>6</u><u>m</u>⠀

Step by Step explanation:

⠀

Let AC be the 7 meters high Flagstaff

And BC be the tower

⠀

Let the height of BC = x

The height of AB will be (x + 7)m

⠀

∠ADB = 45° and ∠CDB = 15°

(as given in the question)

⠀

<u>By</u><u> </u><u>using</u><u> </u><u>trigonometry</u><u> </u><u>formula</u>

$\sf \tan(A) = \frac{perpendicular}{base}$

⠀

⠀

So tan 45 will be

$\sf \implies \tan45{ \degree} = \frac{AB}{BD} \\ \\ \sf \implies \tan45{ \degree} = \frac{x + 7}{BD} \\ \\ \sf \implies 1 = \frac{x + 7}{BD} \\ \\ \sf \implies BD = (x + 7)m$

⠀

⠀

And tan 15 will be

$\sf \implies \tan15{ \degree} = \frac{BC}{BD} \\ \\ \sf \implies \tan15{ \degree} = \frac{x}{BD} \\ \\ \sf \implies 0.2679 = \frac{x}{BD} \\ \\ \sf \implies BD = \frac{x}{0.2679} \\ \\ \sf \implies BD = 3.7327x$

⠀

⠀

Using both Values of BD to find x

⠀

$\sf x + 7 = 3.7327x \\ \\ \sf 7 = 2.7327x \\ \\ \sf \frac{7}{2.7327} = x \\ \\ \sf \boxed{2.56 = x}$

<u>The</u><u> </u><u>height</u><u> </u><u>of</u><u> </u><u>the</u><u> </u><u>tower</u><u> </u><u>is</u><u> </u><u>2</u><u>.</u><u>5</u><u>6</u><u>m</u>

4 0

2 years ago

In a 6th grade Math calss, 4 students were finding the GCF of 24 , 40, and 72. Omar said that the GFC is 4. Brendan said that th

Ugo [173]

The correct answer is B) Brendan because The greatest common factor (GCF) of 24, 40, & 72 = 8 as a result.

5 0

3 years ago

What are the next two number that will complete the sequence 100,121,144,196,225

schepotkina [342]

Answer is 1001,15,000 XO bees crore

3 0

3 years ago

Read 2 more answers

How do you prove that BC is bisecting angle ABA

mr_godi [17]

Answer:

go to khan academy and u can find a vid. answer there!

Step-by-step explanation:

5 0

3 years ago

In Euclidean geometry, the sum of the lengths of 2 sides of a triangle is greater than the length of the third side. The lengths

bearhunter [10]

Answer: $x \in (\frac{5}{3},\frac{19}{3})$

Step-by-step explanation:

Given

length of three sides are

$3x, 7\ and\ 12$

according to Euclidean geometry

$7+12>3x$

$19>3x$

$\frac{19}{3}>x$

also

$3x+7>12$

$3x>5$

$x>\frac{5}{3}$

therefore value of $x \in (\frac{5}{3},\frac{19}{3})$

If x is an integer then x can be $2,3,4,5,6$

7 0

4 years ago