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allsm [11]
3 years ago
7

at a school Fair 70% of the people are under 16 years old one third of the people remaining are teachers if there are 21 teacher

s at the fair how many people are there at the fair total
Mathematics
1 answer:
PolarNik [594]3 years ago
6 0
Hello! One-third of the remaining people are teachers and there are 21 of them. Percents are parts of 100, and 100 - 70 is 30. 1/3 of of that 30% are teachers, and 10 is 1/3 of 30. 10% of those at the fair are teachers and there are 21 of them. As we see, 10% is 1/10 of 100. For this, all we need to do now is multiply 21 and 10. 21 * 10 is 210. There. A total of 210 people are at the fair.
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Find the value of x.<br> 6x+6<br> 9x-9<br> 32<br> 24<br> x = [?]
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Katyanochek1 [597]

Answer:

  1. b/a
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Step-by-step explanation:

These problems make use of three rules of exponents:

a^ba^c=a^{b+c}\\\\(a^b)^c=a^{bc}\\\\a^{-b}=\dfrac{1}{a^b} \quad\text{or} \quad a^b=\dfrac{1}{a^{-b}}

In general, you can work the problem by using these rules to compute the exponents of each of the variables (or constants), then arrange the expression so all exponents are positive. (The last problem is slightly different.)

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1. There are no "a" variables in the numerator, and the denominator "a" has a positive exponent (1), so we can leave it alone. The exponent of "b" is the difference of numerator and denominator exponents, according to the above rules.

\dfrac{b^{-2}}{ab^{-3}}=\dfrac{b^{-2-(-3)}}{a}=\dfrac{b}{a}

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2. 1 to any power is still 1. The outer exponent can be "distributed" to each of the terms inside parentheses, then exponents can be made positive by shifting from denominator to numerator.

\left(\dfrac{1}{4ab}\right)^{-2}=\dfrac{1}{4^{-2}a^{-2}b^{-2}}=16a^2b^2

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3. One way to work this one is to simplify the inside of the parentheses before applying the outside exponent.

\left(\dfrac{4mn}{m^{-2}n^6}\right)^{-2}=\left(4m^{1-(-2)}n^{1-6}}\right)^{-2}=\left(4m^3n^{-5}}\right)^{-2}\\\\=4^{-2}m^{-6}n^{10}=\dfrac{n^{10}}{16m^6}

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4. This works the same way the previous problem does.

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Answer:

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4y-4=28

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4y-4=28

4*(8)-4=28

32-4=28

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So,  y is equal to eight 8

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