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3 years ago

GEOMETRY HELP WILL MARK BRAINLIEST

Mathematics

2 answers:

antoniya [11.8K]3 years ago

7 0

Step-by-step explanation:

using Pythagoras relationship

${x}^{2} = {10}^{2} + {8}^{2} \\ {x}^{2} = 100 + 64 \\ {x}^{2} = 164 \\ x = \sqrt{164} \\ x = 12.806 \\ x = 12.8$

steposvetlana [31]3 years ago

6 0

Answer:

x = 12.81

Step-by-step explanation:

Because this is a right triangle, we can use the Pythagorean Theorem to solve for x. We have 10² + 8² = x² → 100 + 64 → x² = 164 → x = 12.81. Hope this helps!

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How do we multiply decimal numbers

Hitman42 [59]

Answer:

same has numbers

Step-by-step explanation:

examples

look picture

I recommand search a video on it!!!

Picture by math.com

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5 0

3 years ago

Please help , Taking the test

julia-pushkina [17]

The correct Option is (D) y = -0.15x + 1.95

Explanation:
The linear (line) equation is:
y = mx + c

Where
m = slope = rise/run = -0.3/2 = -0.15 (negative sign indicates the downward slope)
c = y-intercept = 1.95 (in graph)

Plug in the values in line equation:
y = -0.15x + 1.95 (Option D)

8 0

3 years ago

Read 2 more answers

Which unit (mm, cm, m, or km) would be the most appropriate for each measurement? a Distance across Lake Michigan b Length of a

Sveta_85 [38]

Distance across a lake would be km (lakes are usually pretty big)
Length of a spoon (cm)
Thinkness of envelope (mm)
Hight of building (m)

8 0

4 years ago

(1-sinx+cosx)^2 = 2(1+sinx)(1+cosx)

bogdanovich [222]

If you're trying to establish an identity, the given equation is not an identity. The proper identity would be as follows:

(1 - sin(x) + cos(x))² = (1 - sin(x))² + 2 (1 - sin(x)) cos(x) + cos²(x)

… = (1 - 2 sin(x) + sin²(x)) + 2 (1 - sin(x)) cos(x) + cos²(x)

… = 2 - 2 sin(x) + 2 (1 - sin(x)) cos(x)

… = 2 - 2 sin(x) + 2 cos(x) - 2 sin(x) cos(x)

… = 2 (1 - sin(x) + cos(x) - sin(x) cos(x))

… = 2 (1 - sin(x) + cos(x) (1 - sin(x)))

… = 2 (1 - sin(x)) (1 + cos(x))

But if you're trying to solve an equation:

(1 - sin(x) + cos(x))² = 2 (1 + sin(x)) (1 + cos(x))

2 (1 - sin(x)) (1 + cos(x)) = 2 (1 + sin(x)) (1 + cos(x))

(1 - sin(x)) (1 + cos(x)) - (1 + sin(x)) (1 + cos(x)) = 0

(1 + cos(x)) (1 - sin(x) - 1 - sin(x)) = 0

-2 sin(x) (1 + cos(x)) = 0

sin(x) = 0 or 1 + cos(x) = 0

sin(x) = 0 or cos(x) = -1

[x = arcsin(0) + 2nπ or x = arcsin(0) + π + 2nπ] or

… [x = arccos(-1) + 2nπ]

We have arcsin(0) = 0 and arccos(-1) = π, so the solution set reduces to

x = 2nπ or x = (2n + 1)π

(where n is any integer)

7 0

3 years ago

Solve the system by substitution. [-2.5x+y = 13.5 12.25x - y=-12.25

IrinaK [193]

Answer:

x = 5/39 , y = 539/39

Step-by-step explanation:

Solve the following system:

{y - 2.5 x = 13.5

12.25 x - y = -12.25

In the first equation, look to solve for y:

{y - 2.5 x = 13.5

12.25 x - y = -12.25

y - 2.5 x = y - (5 x)/2 and 13.5 = 27/2:

y - (5 x)/2 = 27/2

Add (5 x)/2 to both sides:

{y = 1/2 (5 x + 27)

12.25 x - y = -12.25

Substitute y = 1/2 (5 x + 27) into the second equation:

{y = 1/2 (5 x + 27)

1/2 (-5 x - 27) + 12.25 x = -12.25

(-5 x - 27)/2 + 12.25 x = 12.25 x + (-(5 x)/2 - 27/2) = 9.75 x - 27/2:

{y = 1/2 (5 x + 27)

9.75 x - 27/2 = -12.25

In the second equation, look to solve for x:

{y = 1/2 (5 x + 27)

9.75 x - 27/2 = -12.25

9.75 x - 27/2 = (39 x)/4 - 27/2 and -12.25 = -49/4:

(39 x)/4 - 27/2 = -49/4

Add 27/2 to both sides:

{y = 1/2 (5 x + 27)

(39 x)/4 = 5/4

Multiply both sides by 4/39:

{y = 1/2 (5 x + 27)

x = 5/39

Substitute x = 5/39 into the first equation:

{y = 539/39

x = 5/39

Collect results in alphabetical order:

Answer: {x = 5/39 , y = 539/39

5 0

3 years ago