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2 years ago

X/7=3/5 so x=??????????????????

Mathematics

2 answers:

g100num [7]2 years ago

6 0

X = 3 ---> 3*7 = 21 so 5x = 21
7    5

5x = 21 this equals 4.2
5 5

frosja888 [35]2 years ago

5 0

By using cross multiplication x= 3×7÷5=4.2
the answer is 4.2

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Scientific Notation: what’s (2.2 x 10 to the -4) - (3 x 10 to the 2)

Marrrta [24]

Answer:

$2.23\times10^4$

Step-by-step explanation:

In order to get the answer to this question you need to turn the scientific notations into standard form then subtract the two standard forms.

$(2.2\times10^{-4})-(3\times10^2)$

Turn the notations into standard form:

$2.2\times10^{-4} = .00022$

$3\times10^2=300$

$.00022-300=22300$

$=22300$

Turn into notation form:

$22300 = 2.23\times10^{4}$

Hope this helps.

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2 years ago

Approximately 10% of all people are left-handed. Consider a grouping of fifteen people.

vaieri [72.5K]

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2 years ago

21 less than a number, multiplied by 4, results in 108.Find the value of the unknown number.

Anni [7]

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6 0

2 years ago

5^(2x-1)+5^(x+1)=250 how do you solve? thank you

zepelin [54]

Answer:

x = 2

Step-by-step explanation:

Exponential Equations

Solve:

$5^{2x-1}+5^{x+1}=250$

Separate each exponential:

$5^{2x}5^{-1}+5^{x}5^{1}=250$

Operating:

$\displaystyle \frac{5^{2x}}{5}+5^{x}5=250$

Multiplying by 5:

$5^{2x}+25\cdot5^x=1250$

Rearranging:

$5^{2x}+25\cdot5^x-1250=0$

Recall that:

$5^{2x}=(5^{x})^2$

$(5^{x})^2+25\cdot5^x-1250=0$

Calling

$y=5^{x}:$

$y^2+25y-1250=0$

Factoring:

$(y-25)(y+50)=0$

There are two possible solutions:

y=25

y=-50

Since

$y=5^{x}$

y cannot be negative, thus:

$5^{x}=25=5^2$

The solution is:

x = 2

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2 years ago

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gavmur [86]

Answer:

16f/h

+ 112/h

Step-by-step explanation:

thats is I just get it a week ago on a test

6 0

2 years ago