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love history [14]
2 years ago
10

Help its due today ................................

Mathematics
1 answer:
r-ruslan [8.4K]2 years ago
5 0

Answer:

Add -4x to both sides--> 6x+9=4x-3 and 2x+9=-3

multiply both sides by -1/4 --> -4(5x+7)=-18 and 5x-7=4.5

multiply both sides by 1/4--> 12x+4=20x+24 and 3x+1=5x+6

multiply both sides by -4--> -5x/4=4 and 5x=-16

add -4 to both sides--> 8-10x=7+5x and 4-10x=3+5x

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6.50 is 25$ of what number?
Ivenika [448]

Answer:

3.85

Step-by-step explanation:

6.50 goes into 25 how many times

6.50×?=25

6.50 divided by 25 = 3.846153846

Simplify

3.85

8 0
3 years ago
Janet was in an accident. The damage to her car is
Svet_ta [14]

hi tAnswer:hey

Step-by-step explanation:

7 0
2 years ago
2) ½ b – 39 = 101 please show your work
aliya0001 [1]
1/2 b-39=101
       +39  +39
1/2 b= 140
2(1/2) b= 140(2)
b=280
6 0
3 years ago
Read 2 more answers
Midpoint of the segment whose endpoints are (6,9) and (-4,16)
pychu [463]

Answer:

(4,5)

Step-by-step explanation:

(xa+xb/2,ya+yb/2)

(0+8/2,2+8/2)

(8/2,10/2)

(4,5)

hope this helps

3 0
3 years ago
The circumference of a sphere was measured to be 76 cm with a possible error of 0.5 cm. (a) Use differentials to estimate the ma
andreev551 [17]

The maximum error in the calculated surface area is 24.19cm² and the relative error is 0.0132.

Given that the circumference of a sphere is 76cm and error is 0.5cm.

The formula of the surface area of a sphere is A=4πr².

Differentiate both sides with respect to r and get

dA÷dr=2×4πr

dA÷dr=8πr

dA=8πr×dr

The circumference of a sphere is C=2πr.

From above the find the value of r is

r=C÷(2π)

By using the error in circumference relation to error in radius by:

Differentiate both sides with respect to r as

dr÷dr=dC÷(2πdr)

1=dC÷(2πdr)

dr=dC÷(2π)

The maximum error in surface area is simplified as:

Substitute the value of dr in dA as

dA=8πr×(dC÷(2π))

Cancel π from both numerator and denominator and simplify it

dA=4rdC

Substitute the value of r=C÷(2π) in above and get

dA=4dC×(C÷2π)

dA=(2CdC)÷π

Here, C=76cm and dC=0.5cm.

Substitute this in above as

dA=(2×76×0.5)÷π

dA=76÷π

dA=24.19cm².

Find relative error as the relative error is between the value of the Area and the maximum error, therefore:

\begin{aligned}\frac{dA}{A}&=\frac{8\pi rdr}{4\pi r^2}\\ \frac{dA}{A}&=\frac{2dr}{r}\end

As above its found that r=C÷(2π) and r=dC÷(2π).

Substitute this in the above

\begin{aligned}\frac{dA}{A}&=\frac{\frac{2dC}{2\pi}}{\frac{C}{2\pi}}\\ &=\frac{2dC}{C}\\ &=\frac{2\times 0.5}{76}\\ &=0.0132\end

Hence, the maximum error in the calculated surface area with the circumference of a sphere was measured to be 76 cm with a possible error of 0.5 cm is 24.19cm² and the relative error is 0.0132.

Learn about relative error from here brainly.com/question/13106593

#SPJ4

3 0
2 years ago
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