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natka813 [3]
3 years ago
12

Please help, see pic attachment

Mathematics
1 answer:
S_A_V [24]3 years ago
6 0

Answer:

the answer is 30

Step-by-step explanation:

because it is an equilateral triangle all sides are the same so if you set 3x+15 equal to 7x-5 and solve for x you get 4x=20 and x= 5

when you plug 5 in to each equation you get 30 for both sides and so it proves that the answer is 30

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Give an example of when you had to prove something, and how you did it!
Marizza181 [45]

Answer:

Just practice ,know different ways of solving it ,gain experince ,be smart and skilled.

Step-by-step explanation:

if you want to prove anuthing then go with the concept accoeding to the nature of the problem and there are almost many ways to prove anything so don't waste your time on way get on to the other ways.

It may not get proved at first time so keep on doing questions and when you have gained experience you know every nature of problems and then you are skilled properly.

8 0
3 years ago
If R is the midpoint of PS with PR = 7x + 23 and RS= 13x-19 then find PS
Rainbow [258]

If R is the midpoint of PS, then PR = RS -- (1)

Also, PR + RS = PS -- (2)

__________________

PR + RS = PS

7x + 23 + 13x - 19 = PS

__________________

Now, PR = PS

7x + 23 = 13x - 19

7x - 13x = -19 - 23

-6x = -42

x = -42/-6

x = 7

__________________

PS = 7x + 23 + 13x - 19

PS = 7(7) + 23 + 13(7) - 19

PS = 49 + 23 + 91 - 19

<u>PS </u><u>=</u><u> </u><u>1</u><u>4</u><u>4</u><u> </u>

Hope it helps!

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7 0
2 years ago
Ntate runs 12 km in 3 hours. how many hours will it take him to run in 1 km​
docker41 [41]

Answer:

15 minutes or 1/4 hour

Step-by-step explanation:

3 hours = 60*3=180

180/12=15

5 0
2 years ago
Question 2 of 10<br> What is the surface area of the rectangular pyramid below?
Ymorist [56]

Answer:

363

Step-by-step explanation:

11x11=121

((11x11)÷2)x4=11x11x2=121x2=242

121+242=363

5 0
2 years ago
The length of a rectangle is 5 centimeters less than twice its width. The perimeter of the rectangle is 26 cm. What are the dime
iris [78.8K]

Let w and l be the length and height of the rectangle.

We know that:

\begin{cases}l = 2w-5\\2(l+w)=26\end{cases}

Substitute the first equation in the second:

2(l+w)=26 \iff l+w=13 \iff 2w-5+w=13 \iff 3w = 18 \iff w=6

Use the first equation to compute the length:

l=2\times 6 - 5 = 12-5=7

So, length = 7 cm; width = 6 cm

8 0
3 years ago
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