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Mice21 [21]
3 years ago
5

If 15% of 4x is 20 less than x, what is the value of x?

Mathematics
1 answer:
Bess [88]3 years ago
4 0

The sentence "15% of 4x is 20 less than x"

translates to    0.15 • (4x)  = x – 20

Solving that…

    0.15(4x) = x - 20           multiplipy 0.15•4

          0.6x = x - 20           subtract x from both sides

         -0.4x = - 20              divide both sides by -0.4

                x = 50

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-5x + 4y = -14<br> x - 3y = 16
MAXImum [283]

Answer:

?

Step-by-step explanation:

5 0
2 years ago
A is true but f(x) is wrong need help
MrRissso [65]

Answer:

f(x)=-18x^2

Step-by-step explanation:

Given:

1+Integral(f(t)/t^6, t=a..x)=6x^-3

Let's get rid of integral by differentiating both sides.

Using fundamental of calculus and power rule(integration):

0+f(x)/x^6=-18x^-4

Additive Identity property applied:

f(x)/x^6=-18x^-4

Multiply both sides by x^6:

f(x)=-18x^-4×x^6

Power rule (exponents) applied"

f(x)=-18x^2

Check:

1+Integral(-18t^2/t^6, t=a..x)=6x^-3

1+Integral(-18t^-4, t=a..x)=6x^-3

1+(-18t^-3/-3, t=a..x)=6x^-3

1+(6t^-3, t=a..x)=6x^-3

That looks great since those powers are the same on both side after integration.

Plug in limits:

1+(6x^-3-6a^-3)=6x^-3

We need 1-6a^-3=0 so that the equation holds true for all x.

Subtract 1 on both sides:

-6a^-3=-1

Divide both sides by-6:

a^-3=1/6

Raise both sides to -1/3 power:

a=(1/6)^(-1/3)

Negative exponent just refers to reciprocal of our base:

a=6^(1/3)

3 0
3 years ago
2x+3&gt;_7 or 2x+9&gt;11 plzzzz help meee
damaskus [11]

Answer:

b

Step-by-step explanation:

hi I I'm the explanation

4 0
3 years ago
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Anastaziya [24]
I suck at algebra but my advice is download photomath it will help trust me
7 0
3 years ago
On the last day of school 217 6th graders wore sneakers to school. If there are 377 students in the 6th grade, what percent wore
fomenos

Answer:

58%

Step-by-step explanation:

This is because you need to set up the equation _ % of _ is _ and then plug in numbers. _% of 377 is 217 is the final equation. Then divide 217 by 377 which is 0.57559681697. Then you round to the nearest hundredth to get 58%

8 0
3 years ago
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