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Brut [27]
3 years ago
5

I NEED HELP FAST! I WILL GIVE BRAINLIEST!!!

Mathematics
1 answer:
belka [17]3 years ago
3 0

Answer:

x = -1

Step-by-step explanation:

7x-3x = -8+4

4x = -4

4x/4 = -4/4

x = -1

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Solve this i am not able to solve​
Margarita [4]

Answer:

Step-by-step explanation:

First we need to set this ratio up in the coordinate plane. Because this is tangent, the 3 goes opposite the reference angle and the 4 goes along the x-axis, adjacent to the reference angle. We see that we are missing the third side of the triangle when we do this, namely the hypotenuse. We use Pythagorean's Theorem to find that this side is 5. Now we have to deal with the identities for each sin(2A) and cos(2A).

sin(2A) = 2sin(A)cos(A)

We know from the triangle we drew in the coordinate plane that

sin(A)=\frac{3}{5}  and  cos(A)=\frac{4}{5} so we fill in the formula accordingly and then simplify:

sin(2A)=2(\frac{3}{5})(\frac{4}{5})=\frac{24}{25}

cos(2A) has 3 identities; I just picked the one I thought would be easiest to use and went with that one. Regardless of which one you pick you will get the same answer as long as you do the math correctly.

cos(2A)=cos^2(A)-sin^2(A) and filling in the formula:

cos(2A)=(\frac{4}{5})^2-(\frac{3}{5})^2\\cos(2A)=\frac{16}{25}-\frac{9}{25}\\cos(2A)=\frac{7}{25}

I'm not sure why you have 7/2 there...

8 0
3 years ago
9x-5y=29 find the value of y when x equals 1
svp [43]
9x - 5y = 29....when x = 1
9(1) - 5y = 29
9 - 5y = 29
-5y = 29 - 9
-5y = 20
y = 20/-5
y = -4 <==
7 0
4 years ago
Read 2 more answers
A company is interested in testing sample sets of 20 Widgets to see how they withstand a heat test. Widgets fail the heat test w
Andreyy89

Answer:

Discrete Distribution.

Step-by-step explanation:

For each widget, there are only two possible outcomes. Either they develop paint cracks, or they do not. The probability of a widget developing paint cracks is independent of any other widgets, which means that the binomial probability distribution, which is a discrete distribution, is used to solve this question. Thus the answer is a Discrete Distribution.

6 0
3 years ago
Solve for a side in right triangles
natita [175]

Answer:

  2.30

Step-by-step explanation:

The side of interest is opposite the given angle, and the hypotenuse is given. The sine relation tells you ...

  sin(A) = a/c

  a = c·sin(A) = 3·sin(50°)

  a = BC ≈ 2.2981 ≈ 2.30

5 0
4 years ago
The exterior angle of a triangle is 119° and its interior opposite angle are in the ratio 8:9. Find the angle of a triangle
erastovalidia [21]

Answer:

see explanation

Step-by-step explanation:

the ratio of the opposite interior angles = 8 : 9 = 8x : 9x

The exterior angle of a triangle = sum of the opposite interior angles, hence

8x + 9x = 119

17x = 119 ( divide both sides by 17 )

x = 7

8 parts = 8x = 8 × 7 = 56

9 parts = 9x = 9 × 7 = 63

The sum of the 3 angles in a triangle = 180°

subtract the sum of the 2 angles from 180 for third angle in triangle

180° - (56 + 63)° = 180° - 119° = 61°

The 3 angles of the triangle are 56°, 61°, 63°


8 0
3 years ago
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