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svetlana [45]
2 years ago
8

Full explanation please will mark brainlist

Mathematics
1 answer:
just olya [345]2 years ago
8 0

Answer:

Hope the picture will help you.....

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What is the length of side AC of the triangle?
ryzh [129]

Answer:

AC = 25 units

Step-by-step explanation:

Given ∠ A = ∠ C then the triangle is isosceles and BC = AB , that is

7x - 1 = 5x + 5 ( subtract 5x from both sides )

2x - 1 = 5 ( add 1 to both sides )

2x = 6 ( divide both sides by 2 )

x = 3

Then

AC = 6x + 7 = 6(3) + 7 = 18 + 7 = 25 units

3 0
3 years ago
Exact value of cos45
Anit [1.1K]

It's a value you should probably memorize:

\cos45^\circ=\dfrac{\sqrt2}2=\dfrac1{\sqrt2}

You can derive it using some trigonometric identities, other known values of cosine, and properties of the cosine function. For example, using the double angle identity for cosine:

\cos^2x=\dfrac{1+\cos2x}2

If x=45^\circ, then

\cos^245^\circ=\dfrac{1+\cos90^\circ}2

and you probably know that \cos90^\circ=0, so

\cos^245^\circ=\dfrac12

When we take the square root, we should take the positive root because \cos x>0 whenever 0^\circ:

\cos45^\circ=+\sqrt{\dfrac12}\implies\cos45^\circ=\dfrac1{\sqrt2}

4 0
3 years ago
25 1/2 × 8 4/3 =........
tatiyna
D. 200
yaaaaaaaa
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5 0
3 years ago
The length of a rectangle is 9 less than 4 less than the width. The perimeter is 143. Find the width and length.
damaskus [11]

The formula for perimeter is 2l+2w. Since we know l=(w-4)-9, we can substitute this into the formula.

l=w-13

2(w-13)+2w=143

2w-26+2w=143

4w=169

w=42.25 units

Hope this helps!

6 0
3 years ago
At a sale this week, a Michael Kors bag is on sale for $258.40. This is a 62% discount off the original price. What is the origi
Furkat [3]
$680 was the original price!

100-62=38

258.40 x 100= 25840

25840/38=680
8 0
3 years ago
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