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ivanzaharov [21]
3 years ago
5

please help.....................................................................................................................

........

Mathematics
1 answer:
hodyreva [135]3 years ago
6 0
28 out of 40 is 70%, so I think the answer is 70%.
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The population of a city in 2005 was 18,000. By 2010, the city’s population had grown to 45,000. Economists have determined that
tensa zangetsu [6.8K]
2005= 18,000
2010= 45,000


1) make 2005 year "0", and 2010 year "5"
2)in order to solve this problem and figure out the rate of change, we must use the equation for exponential functions y=ab^x
3) a= the y- value of y intercept ( what does y equal when x is zero) in this case a population number so, a= 18,000; b= the unknown rate of change; x= time and since we're finding  b we can plug in 5 for the time in years; y= the value of y in terms of the x-value, so when x is 5, y is 45,000
4) you end up with something like this
45,000= 18,000b^5
5) in order to proceed to solve you must get b alone
6) divide both sides by 18,000
7) so you no have 2.5= b^5
8) take the fifth root of both sides 
9) now you have your answer b=<span>1.20112443398</span>
6 0
3 years ago
Read 2 more answers
Please can someone help me with this
Eduardwww [97]

Answer:

\boxed{V = 434.9 \ cm^3 }

Step-by-step explanation:

Volume of Sphere = \frac{4}{3} \pi r^3

Where r = 4.7 cm

V = \frac{4}{3} (3.14)(4.7)^3

V = \frac{4}{3} (3.14)(103.8)

V = \frac{1304.7}{3}

V = 434.9 cm³  (Up to 1 dp)

4 0
4 years ago
Read 2 more answers
Check
Angelina_Jolie [31]
2x + y = badussy

hope it helps!!!

give brainliest pwease
3 0
2 years ago
A soccer field is 100 yd wide and 130 yd long. find the length of the diagonal of such a field. give an exact answer as a radica
Misha Larkins [42]
We know that
<span>applying the Pythagorean theorem
c</span>²=a²+b²
c is the <span>length of the diagonal
a=100 yd
b=130 yd
c</span>²=100²+130²-------> c²=26900---------> c=√26900 units----> c=10√269 units

the answer is
the length of the diagonal is 10√269 units  or 164.012 units
4 0
3 years ago
Simplify cube root of 7 over fifth root of 7.
Paha777 [63]

\bf a^{\frac{ n}{ m}} \implies  \sqrt[ m]{a^ n}  \qquad \qquad \sqrt[ m]{a^ n}\implies a^{\frac{ n}{ m}}\\\\[-0.35em] \rule{31em}{0.25pt}\\\\ \cfrac{\sqrt[3]{7}}{\sqrt[5]{7}}\implies \cfrac{\sqrt[3]{7^1}}{\sqrt[5]{7^1}}\implies \cfrac{7^{\frac{1}{3}}}{7^{\frac{1}{5}}}\implies 7^{\frac{1}{3}}\cdot 7^{-\frac{1}{5}}\implies 7^{\frac{1}{3}-\frac{1}{5}} \\\\\\ 7^{\frac{5-3}{15}}\implies 7^{\frac{2}{15}}

3 0
3 years ago
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