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jeyben [28]
3 years ago
11

Hi :), im really struggling with this. Just wanted to know if anyone can explain step by step for me please. Id really appreciat

e it.

Mathematics
1 answer:
Dvinal [7]3 years ago
7 0

Answer:

314 m²

Step-by-step explanation:

the formula for the surface area of a sphere (As) is

As = 4×pi×r²

the radius r (half of the diameter) is clearly indicated as 5m.

so, As = 4×3.14×5² = 4×3.14×25

I don't even need a calculator for this, as 4×25 = 100

so, As = 100×3.14 = 314

(you know, when multiplying by 10, the decimal point moves right one position. multiply by 100 it moves 2 positions, and so on).

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Solve the system of equations by using the addition method
Paha777 [63]
How do you solve this system of equations using the addition method:
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−
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?
Algebra
1 Answer


IDKwhatName
Jun 30, 2017
x
=
−
2
,
y
=
−
4
Explanation:
Right now, you have:
4
x
−
y
=
−
4

5
x
+
2
y
=
−
18
To make this easier, you must get rid of one variable, in this case I will remove
y
, to do this you must make the y-values in both equations the same.
To do this, I will multiply the whole of
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x
−
y
=
−
4
by 2 to give
8
x
−
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y
=
−
8
We now have:
8
x
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2
y
=
−
8

5
z
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=
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18
All we need to do now is
(
8
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y
+
5
x
+
2
y
)
=
(
−
18
−
8
)
≡
13
x
=
−
26
.
Divide both sides by 13 to find
x
:
13
x
=
−
26

13
x
13
=
−
26
13

x
=
−
2
Now put your value for
x
into either equation:
4
(
−
2
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−
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−
8
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4

y
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6 0
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Solve for x 6(x+5)-3(x-2)=12x+18
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7 0
3 years ago
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6 0
3 years ago
|x-2| + |x+1| -5=0<br> find x
marissa [1.9K]

Answer:

|x-2| + |x+1| -5=0

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⇒x=3

Step-by-step explanation:

6 0
3 years ago
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