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SpyIntel [72]
3 years ago
13

I really dont understand helppp

Mathematics
2 answers:
Mice21 [21]3 years ago
7 0

Answer:

1.   13

2.  8

3.  26

Step-by-step explanation:

1.  9x+2=119

9x=117

x=13

2.  12x-8=104

12x=96

x=8

3.  5x+7=8x-71

7=3x-71

78=3x

x=26

Tema [17]3 years ago
5 0

Answer:

x=13 degrees

Step-by-step explanation:

Since m is parallel to l, 119= (9x+2)

119=9x+2

Subtract 2

117=9x

Divide by 9

13=x

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120 - 4 - 6 = ( that is the process, you ca find the answer)
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2 years ago
Given an equilateral triangle that has an area of 1959 cm2. What is the length of its sides?
Nina [5.8K]
Equilateral
equi means equal
lateral means sides

all sides are equal
triangle has 3 sides

perimiter=side1+side2+side3
side1=side2=side3


area=1/2 times base times height
base=side
draw a line down the middle of te tiangle so you get 2 right triangles side by side
1/2base is one leg
base is hypotonuse
height is unknown
equilateral means that it is a 30-60-90 triangle with  hypotonuse equal to 2x, height=x√3, bottom is x
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(x^2)√3=3918
divide both sides by √3
x^2=3918/√3
square root both sides
x=47.5611
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legnth of each side is 2\sqrt{ \frac{3918}{ \sqrt{3} } }cm or about 95.12222 cm
7 0
3 years ago
I need help please I don’t understand this
mario62 [17]

Answer:

cosB = 21/75, tanB = 72/21

Step-by-step explanation:

Here, we can use pythagoras to figure out all sides. 75^2-72^2 = 21^2. So, we have sides with lengths 21, 72, and 75. We are given that sinB = 72/75. The definition of sin is opposite of hypotenuse. So, the opposite of angle B is side CA and the hypotenuse is BA. This allows us to find that BC is the 21 length side. The cos of an angle is adjacent over hypotenuse. In this case, it is BC/BA which is 21/75. similarly, Tan is opposite over adjacent or 72/21. And we are done. Those are the values. TO remember these, use the acronym:

SOH CAH TOA. S refers to sin and OH refers to opposite over hypotenuse. Similarly C is cos, A is adjacent, and H is hypotenuse, and then T is tan,  o is opposite and A is adjacent.

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The coordinates for point A is (-2,-5)
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26 but use photomath it's a great app that automatically solves math problems of any kind
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