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3 years ago

4(5n -7) =10+2 i need step by step explanation i dont get it

Mathematics

1 answer:

ser-zykov [4K]3 years ago

7 0

Answer:

n=2

Step-by-step explanation:

4(5n-7)=10+2

1) First, distribute (multiply out 4)

20n-28=10+2

2) Combine like terms (add 10 and 2)

20n-28=12

3) Isolate the variable (Add 28 to 12)

20n=40

4) Isolate the variable (Divide by 20)

n=2

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The percent error For Diego measurement is 4.3 % decrease

Solution:

Given that, Diego measured the length of a pain to be 22 cm

The actual length of the pen is 23 cm

To find: percent error

Percent error is the difference between a measured and actual value, divided by the actual value, multiplied by 100%

The formula for percent error is given as:

$\text{Percent error } = \frac{\text{Measured value - actual value}}{\text{Actual value}} \times 100$

Here given that,

Measured value = 22 cm

Actual value = 23 cm

Substituting the values in formula,

$Percent\ Error = \frac{22-23}{23} \times 100\\\\Percent\ Error = \frac{-1}{23} \times 100\\\\Percent\ Error = -0.043 \times 100\\\\Percent\ Error = -4.3$

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3 years ago