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3 years ago

I don’t get this at all please help!!

Mathematics

2 answers:

saveliy_v [14]3 years ago

8 0

Answer:

29) x = 12

30) x = 6

31) x = -4

32) x = 5

Not sure if the degree symbol is needed for the answer.

Step-by-step explanation:

Apply angle sum of triangles to all 4 questions.

29) (3x + 4) + 50 + 90 = 180 i.e. x = 12

30) (8x + 7) + 35 + 90 = 180 i.e. x = 6

31) 64 + 65 + (x + 55) = 180 i.e. x = -4

32) 70 + 35 + (14x + 5) = 180 i.e. x = 5

bonufazy [111]3 years ago

6 0

Answer:

I can't this type of mathematics

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Oksana_A [137]

Answer:

The correct answer is 31x + 0.5

Step-by-step explanation:

∵ 13x + 5 + 17x - 4.5 + x

To solve this correctly you must to add the coefficients of the like terms (terms who has same variables or constant terms)

∵ 13x , 17x , x are like terms ⇒ terms with same variable

(same letters and same power)

∵ 5 , 4.5 are like terms ⇒ constant terms (numbers only)

∴ (13x + 17x + x) + (5 - 4.5) = 31x + 0.5

* The error of first answer:

- 18x + 17x - 4.5 + x

- She add 13x + 5 = 18x ⇒ she add unlike terms

* The error of second answer:

- 35x - 4.5 + x

- She add 13x + 5 + 17x = 35x ⇒ she add 2 like terms with 1 unlike term

* The error of third answer:

- 30.5x + x

- She add 13x + 5 + 17x - 4.5 = (13x + 17x) + (5 - 4.5) =

30x + 0.5 ⇒ she add 2 like terms and 2 constant terms

and then add the 2 unlike answers

* The error of fourth answer:

- 31.5x

- She add 13x + 5 + 17x - 4.5 + x = (13x + 17x + x) + (5 - 4.5) =

31x + 0.5 ⇒ she add 3 like terms and 2 constant terms

and then add the 2 unlike answers

5 0

3 years ago

Can someone help explain this to me? I don’t think I’m doing it right.

seropon [69]

∠B = 77°, a = 7.42 and b = 12.61

Solution:

Given triangle ABC.

∠A = 35°, ∠C = 68°, c = 12

To find the measure of ∠B:

Sum of all the angles of the triangle = 180°

⇒ ∠A + ∠B + ∠C = 180°

⇒ 35° + ∠B + 68° = 180°

⇒ 103° + ∠B = 180°

⇒ ∠B = 180° – 103°

⇒ ∠B = 77°

To find the length of a and b:

The side opposite to angle A is a.

The side opposite to angle B is b.

Using law of sine,

$$\frac{\sin C}{c}=\frac{\sin A}{a}$

$$\frac{\sin 68^\circ}{12}=\frac{\sin 35^\circ}{a}$

$$\frac{0.9271}{12}=\frac{0.57357}{a}$

Do cross multiplication, we get

$$0.9271a=6.88284$

Divide by 0.9271 on both sides, we get

⇒ a = 7.42

Again by law of sine,

$$\frac{\sin C}{c}=\frac{\sin B}{b}$

$$\frac{\sin 68^\circ}{12}=\frac{\sin 77^\circ}{b}$

$$\frac{0.9271}{12}=\frac{0.9744}{b}$

Do cross multiplication, we get

$$0.9271b=11.6928$

Divide by 0.9271 on both sides, we get

⇒ b = 12.61

Hence ∠B = 77°, a = 7.42 and b = 12.61.

7 0

3 years ago

Solve <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bx%7D%7B-4%7D" id="TexFormula1" title="\frac{x}{-4}" alt="\frac{x}{-4}" align="

Taya2010 [7]

Answer:

Step-by-step explanation:

8 0

4 years ago

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Write an equation of a line passing through (-1,9) and (-5,11).

lubasha [3.4K]

Answer:

Hi there!

The answer to this question would be:

Step-by-step explanation:

the general equation would be: y= -1/2x + 17/2

first you want to solve for the slope (m): you wanna do delta y (change of y ) over delta x (change of x)

so it goes like (11-9)/(-5-(-1)) and you get -1/2

then you want to solve for the y intercept (b)

so you plug in one of the point that you were given, in this case I am using (-1,9)

so now the equation looks like 9 = 1/2 +b then solve for b and you get b=17/2

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3 years ago

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Vanyuwa [196]

Answer:

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Step-by-step explanation:

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3 years ago

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