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What i would do is try to find make a [triple] venn diagram

you know 2.5% dont have any, so we only count 195 people. 

The 12% would go in the middle section.

840
8-4=4

4-4=0

840+2=842

8/4=2

4/2=2

if we convert each number to make the denominator 2^10, we get 2^9+2^8...1(all the numerators).

If we add powers of 2 starting from one, it is always one less than the nest power of 2

1+2 is 1 less than 4, 1+2+4 is 1 less than 8, and so on. 

So it would be (2^10-1)/2^10, or 1023/1024.

-6/6 is -1, so it keeps on multiplying by negative one. Looking at the pattern, we see that the number six is in the odd positions. Since 205 is odd, the answer is 6.

243/81 is 3, so

81/3=27, and

27/3, is 9.

243, 81, 27, 9 , 3.

X+y=27+9=36.

First stop - 48/2 =24

Second stop - 24/2=12

Final stop - 12/2=6

6 students remain.

Each term gets smaller by dividing by 3, so term 1 is, term 2 is \({9}/3^1\), and so on. Continuing the pattern, number 10 would be \(9/3^9 or 1/3^7 or 1/2187\)

https://web2.0calc.com/questions/geometry-help_68

102/2*

a14-a1 is 91, so the next term will always be 91/(14-1) more than the last, or 7 more.

a) a rule would be a(x)=6+7(x-1)

b) If we use the x axis as the a-number, we get that for every time we move over 1 x, the y increases by 7. This leads to a slope of 7. so we have y=7x+b. Plugging in the above examples a1=6 and a14=97, we get that the full equation should be y=7x-1.

c)The slope is how much the amount changes each time the a-number is increased by one. The y-intercept is the 0th number,-1.

d) using our rule, 6+7*27 is 6+189 or 195.