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navik [9.2K]
3 years ago
15

Who is known for inventing the telephone?

Mathematics
1 answer:
solmaris [256]3 years ago
4 0

Answer:

D

Step-by-step explanation:

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The area of a triangle is 861 square cm. The length of the base is 82 cm. What is the height of the triangle?
Cerrena [4.2K]
Hi!

The equation to find the area of a triangle is...

(a = area
b = base
h = height)

a =  \frac{1}{2} bh

Fill in the values that we already have.
861 = \frac{1}{2}82*h
Divide both sides by 1/2
861/ \frac{1}{2}  = \frac{1}{2}/ \frac{1}{2}82*h
1722 = 82*h
Divide both sides by 82.
1722/82 = 82/82*h
21 = h

The answer is B. 21 cm

Hope this helps! :)
5 0
3 years ago
Solve 3÷x-1 - 4÷x+2=2
natita [175]
3/ x -1 - 4 / x + 2=2
I work a bit backwards so, lets try looking at it like this,
3/ X
 -4/X
what could X be to let these be positive since our outcome is positive? 
3/0=0
4/0=0
so 3/0-1= -1
-1-4/0= 0
+2= 2
so 2=2 
so now we go and fill it in to make sure
3/0-1-4/0+2=2
and it works so,
X= 0
I hope this helped some

6 0
4 years ago
If 200 vitamines cost $8.75, what should 500 vitamins cost?
WARRIOR [948]
Hello!  So, the problem is saying that 200 vitamins cost $8.75, and that is what we know.  We also know that we're going to be looking at the cost of 500 vitamins, but we don't know.  The numbers presented can be put into a proportion, and that can help solve the problem.  200 to 8.75, and 500 to a number we don't know.  I'm no sure if you familiar with the how to set up a proportion, but it's saying this number over this other number (which is a fraction) equals another fraction.  Make sure that your numbers always match up, so your not saying vitamins over money equal money over vitamins.  Use cross products, divide, and then you'll have your answer.  For this problem, since yours solving for money, make sure to have two decimal points and a dollar sign.  I hoped this helped, if you have any questions shoot me a question or message.  Good luck!
7 0
3 years ago
Read 2 more answers
Indicate the method you would use to prove the two A's. If no method applies, enter "none".
VikaD [51]
AAS is your answer because you have 30 and 70 degrees next to each other and they are both angels and then 10 which is a side
You would use AAS because that’s the pattern or your triangle
3 0
2 years ago
Read 2 more answers
How do you write 1÷3 as a fraction
kvv77 [185]
I believe it to be 1 over 3 as 1 as the numerator and 3 as the denominator
7 0
3 years ago
Read 2 more answers
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