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miv72 [106K]
3 years ago
13

15 x 15 what is the answer to hit I was always wondering

Mathematics
2 answers:
Mice21 [21]3 years ago
4 0

Answer:

225

Step-by-step explanation:

V125BC [204]3 years ago
4 0

Answer:255

Step-by-step explanation:

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If 2/x+ 3/y =13 and 5/x- 4/y = -2, then x+y equals
creativ13 [48]

Answer:

x + y =  \frac{5}{6}

Step-by-step explanation:

Let:

u =  \frac{1}{x}  \\ v =  \frac{1}{y}

This allows us to manipulate the equations like we normally would.

2u + 3v = 13 \\ 5u - 4v =  - 2 \\  \\   + 8u + 12v = 52 \\  + 15u - 12v =  - 6 \\ 23u = 46 \\ u = 2 \\  \\ 2(2) + 3v = 13 \\ 4 + 3v = 13 \\ 3v = 9 \\ v = 3

Then, we return the values where they belong.

u =  \frac{1}{x}  \\ 2 =  \frac{1}{x}  \\ x =  \frac{1}{2}  \\  \\ v =  \frac{1}{y}  \\ 3 =  \frac{1}{y}  \\ y =  \frac{1}{3}

Finally, we add:

\frac{1}{2}  +  \frac{1}{3}  =  \frac{3}{6}  +  \frac{2}{6}  =  \frac{5}{6}

7 0
3 years ago
Find the discount.
OLEGan [10]
As the amount is $100 dollars, you will have to find what 35% of this is. The best way to do this is to divide both 100 and 35 by ten, giving you ten and 3.5. AS 10 is 10% of 100, you should then multiply then, by three and half, therefore, giving you 35- meaning the discount is $35 dollars. Hope this helps

4 0
3 years ago
Read 2 more answers
A square has an area of 64 cm<br> Find the perimeter of the square.
julia-pushkina [17]

Answer:32cm

Step-by-step explanation:

Length=L

Area=64

Area=L x L

64=L^2

L^2=64

Take them square root of both sides

√(L^2)=√(64)

L=8

Perimeter of square=4 x L

Perimeter of square=4 x 8

Perimeter of square=32

Perimeter =32cm

8 0
3 years ago
Which of the three runners have the fastest pace? Explain how you know.
GenaCL600 [577]
What is the image, i can’t see it?
6 0
4 years ago
Ayana bought a cibtsiber of peanuts. She gave 1/5 of the peanuts tie vibe sister and 3/4 of what remained to another sister. She
Alja [10]
If Ayana gave 1/5 of the peanuts to her sister and then 3/4 of what remained to another sister, she kept 1/5 for herself. It's because:

5/5 is what she got at the beginning
5/5 - 1/5 = 4/5 is what she gave to one sister
3/4 of what remained is 3/4 * 4/5 = 12/20 = 3/5 for another sister

So now 4/5 - 3/5 = 1/5 is what she kept for herself.
7 0
3 years ago
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