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Serga [27]
2 years ago
13

Which equation is equivalent to the equation x^2+y^2= 25?

Mathematics
1 answer:
satela [25.4K]2 years ago
3 0

9514 1404 393

Answer:

  D.  y = ±√(25 -x²)

Step-by-step explanation:

Subtract x² and take the square root to solve for y.

  x² +y² = 25 . . . . . . . given

  y² = 25 -x² . . . . . . . . subtract x²

  y = ±√(25 -x²) . . . . . take the square root

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Help me pls and be serious or I’ll hurt u
GREYUIT [131]

Answer:

-9

Step-by-step explanation:

Khan Academy huh? Well, the answer's -9.

-7 = -9 + 2

Hope that helps!

5 0
3 years ago
Read 2 more answers
A square napkin is folded in half on the diagonal and placed on the diameter of a round plate (see diagram below). If the folded
Crank

Answer:

A=81(\pi-1)\ in^2

Step-by-step explanation:

step 1

Find the area of the plate

The area of a circle is given by the formula

A=\pi r^{2}

we have

r=18/2=9\ in ---> the radius is half the diameter

substitute

A=\pi (9)^{2}\\A=81\pi\ in^2

step 2

Find the area of the square napkin folded (is a half of the area of the square napkin)

we know that

The diagonal of the square is the same that the diameter of the plate

Applying Pythagorean theorem

D^2=2b^2

where

b is the length side of the square

we have

D=18\ in

substitute

18^2=2b^2

solve for b^2

b^2=162\ in^2 -----> is the area of the square

Divide by 2

162/2=81\ in^2

step 3

Find the area of the space on the plate that is NOT covered by the napkin

we know that

The  area of the space on the plate that is NOT covered by the napkin, is equal to subtract the area of the square napkin folded (is a half of the area of the square napkin) from the area of the plate

so

A=(81\pi-81)\ in^2

simplify

A=81(\pi-1)\ in^2

8 0
3 years ago
A bag of 4 cookies cost £1.80 how much will 1cost
Vinvika [58]
£1.80 divided by 4 =0.45...
so the answer is 45p...
hope this helps and HAGD!!
6 0
3 years ago
Read 2 more answers
If the mean if these numbers is 9 what is x ? <br><br> 16,3,x,5
siniylev [52]
The mean is the average number meaning that it is all the numbers in a set added together and divided by how many number are in the set. In this case there are 4 numbers (16, 3, whatever number x is, and 5). So, to find out what x is, first you multiple 4 by the known mean which is 9.
4 x 9 = 36
Then you simply subtract 36 from all the known numbers to find x.
36 - 16 - 5 - 3 = 12
So x = 12
5 0
3 years ago
Can anyone help me with 3 and 4
Gnoma [55]
No as they do not simplify into the same fraction
linear as it the volume is a fraction to the side
5 0
2 years ago
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