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Aleksandr [31]
3 years ago
14

Please help me, I need to get a good score on this test so bad.

Mathematics
1 answer:
cluponka [151]3 years ago
3 0
1. (100 - 25) / 100...x 100
     75/100 = 0.75....x 100 = 75% decrease

2. (66 - 45) / 66....x 100
     21/66 = 0.318...x 100 = 31.8% increase

3. 36,000(1.05) = $ 37,800

4. 64(1.25) = 80

5. having trouble with this...what is the tax rate ? 75%...or 7.5%
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Help please!!! I really need it
jenyasd209 [6]

Answer:

140

Step-by-step explanation:

2000 divided by 7% will give you 140 hope it helps

6 0
3 years ago
Solving proportion 10\8=n\10
Zanzabum
\frac { 10 }{ 8 } =\frac { n }{ 10 } \\ \\ 10\cdot \frac { 10 }{ 8 } =\frac { n }{ 10 } \cdot 10\\ \\ \frac { 100 }{ 8 } =n

\\ \\ n=\frac { 4\cdot 25 }{ 4\cdot 2 } \\ \\ \therefore \quad n=\frac { 25 }{ 2 }
6 0
3 years ago
Read 2 more answers
Marcos purchased a sail boat for $56,900. He anticipates each year the boat will decrease in value by 8.1% from the previous yea
Varvara68 [4.7K]

Answer: 56,900\left( 0.919\right)^x

Step-by-step explanation:

Given

Marcos purchased a sailboat for \$56,900

Each year the boat will decrease in value by 8.1\%

After 1 year it is

\Rightarrow 56,900-56,900\times 0.081\\\Rightarrow 56,900\left( 1-0.081\right)\\

after another year it becomes

\Rightarrow 56,900\left( 1-0.081\right)-56,900\left( 1-0.081\right)\times 0.081\\\Rightarrow 56,900\left( 1-0.081\right)\cdot \left( 1-0.081\right)\\\Rightarrow 56,900\left( 1-0.081\right)^2

After x years it is

\Rightarrow 56,900\left( 1-0.081\right)^x

\Rightarrow 56,900\left( 0.919\right)^x

5 0
2 years ago
Find the surface area of the triangular prism please.
Kobotan [32]
Surface area =  area of 3 rectangles + 2 triangles

            =  3*(3*7) + 2 * ( 1/2 * 3 * 2.6)

            =   63 +   2* 3.9

            =   70.8  in^2

3 0
3 years ago
Since 1972 the US. inflation rate has averaged 4.8 % per year . Use the approximate doubling time formula to estimate the doubli
Artemon [7]

Answer:

14  3/4 years

Step-by-step explanation:

Let's assume compound inflation.  The appropriate formula for that is:

A = P(1 + r)^t.

If we represent current prices by P, then double that would be 2P:

2P = P(1 + 0.048)^t    Find t, the time required for prices to double.

Then:

2   =  1.048^t

Taking the natural log of both sides, we get:

ln 2 = t·ln 1.048, so that:

t = (ln 2) / (ln 1.048)   =   14.78

At 4.8 inflation, with annual compounding, prices will double in approx. 14 3/4 years.

3 0
3 years ago
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