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masha68 [24]
3 years ago
13

Write an equivalent expression for 40 + 8(n-3)​

Mathematics
1 answer:
omeli [17]3 years ago
3 0
An equivalent expression is
40 + 8n - 24
simplified:
16 + 8n

hope this helps!
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In a certain region each person is understood to live either in the city or the suburbs. Each year 6% of the city population mov
Kaylis [27]

Answer:

y₁=x₁+0.04x₂

y₂=x₂+0.06x₁

Step-by-step explanation:

In the first year, number of people who live:

In the city= x₁

In the suburb=x₂

New Population in the next year

In the city= y₁

In the suburb=y₂

If each year 6% of the city population moves to the suburb,

New Suburb Population=Previous Population+Immigrants

y₂=x₂+0.06x₁

If each year 4% of the suburb population moves to the city,

New City Population=Previous Population+Immigrants

y₁=x₁+0.04x₂

y₁=x₁+0.04x₂

y₂=x₂+0.06x₁

5 0
3 years ago
Mary invests £12,000 in a savings account the account pays 1.5% compound interest per year work out the value of her investment
Lesechka [4]

Answer:

The value of Mary's investment after two years = £12362.7

Step-by-step explanation:

P = Principal / initial amount

R = rate of interest per cent per year

T = number of years

A = final amount at the end of T years

Then:

A = P*(1 + R/100)^2

In our example:

P = £12000

R = 1.5 per cent per year

T = 2 years

Thus:

A = 12000*(1 + 1.5/100)^2

  = 12000*(1 + 0.015)^2

  = 12000*(1.015)^2

   = 12000*(1.030225)

   = 12362.7

Value of investment after two years = £12362.7

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