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1. ### what is question 19?

... exponents.  We can do that with the 10s, then divide the other non-10s... to 3 SF: F = 1.98754 * 10¹ * 10¹⁹ F = 1.99 * 10¹ * 10¹⁹ Finally...

1 Answers · Science & Mathematics · 07/02/2020

2. ### Given that the test is negative, what is the probability that the person does not have the disease?

...'t have the disease) = 0.95 *0.99 = 0.9405 P(test negative ) = P( Does not have the disease and the test was...disease and the test was negative) so the 1st is 0.9405 which we just determinded...

1 Answers · Science & Mathematics · 29/09/2019

3. ### Is there a method to work out how to express a non-unit fraction as the product of unique unit fractions?

...; 4/33 < 1/8 , so k = 9 . 4/33 = 1/9 + 3/297 = 1/9 + 1/99 , so this process is finished . That is , 5/11 = 1/3...

2 Answers · Science & Mathematics · 01/09/2019

4. ### I'm so dumb right?

... (and other tricks) when doing mental calculations. One... example, 7 times 99. This is the same as 7 times (100 - 1) 7 times 100 is easy (700...

6 Answers · Science & Mathematics · 13/08/2019

5. ### What are the least number of terms required for the sum of the series Σ(3-2r)* to be less than -100?

...to that are: n < 1 - √101 or n > 1 + √101 That's approximately: n < -9...when n = 12. Double-check: 11 terms --> sum = -99 12 terms --> sum = -120 (which is the ...

1 Answers · Science & Mathematics · 01/05/2019