4 years ago

Solve the system of equations using the substitution method 4x-y=5 x+y=10

Mathematics

1 answer:

Lesechka [4]4 years ago

7 0

Ok so if 4x-y=5 then x+y=10 thats the answer

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A sofa depreciates at 20% of its original value each year. If the sofa was $349 at its time of purchase, what is the value of th

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Answer:

$142.95

Step-by-step explanation:

Given Original value of the sofa = $349

Rate of depreciation each year = 20%

Number of years = 4

To find the value of the sofa after 4 years use depreciation formula:

If the constant decrease in population be R% per annum. Then the population after n years is $P \times\left(1-\frac{R}{100}\right)^{n}$

$349 \times\left(1-\frac{20}{100}\right)^{4}=349 \times\left(\frac{100-20}{100}\right)^{4}$

$=349 \times\left(\frac{80}{100}\right)^{4}$

$=349 \times\left(\frac{4}{5}\right)^{4}$

= 142.9504

= 142.95 (Nearest cent)

Hence, the value of sofa after 4 years is $142.95.

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Answer:

9.85

Step-by-step explanation:

you can use the Pythagoras theorem

$a^2+b^2=c^2$

with c the hypotenuse

$9^2+4^2=c^2\\\\81+16=c^2\\\\97=c^2\\\\c=\sqrt{97}$

which is aprox

9.85

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