Question

This is the excercise: (363 × 1.48)/3.5-1.79 + 6.1 × 10^−1
However, my question is unralated the answer. Does 10^-1 out as a significant figure? and if it does, it would count as 1 digit, right?

Answer 1

hmmm what's the question again?

Answer 2

Write 10^{-1} as a decimal, then it should be obvious to you.

Answer 3

\[(\frac{ (363*1.48) }{ 3.5-1.79 })+6.1*10^{-1}\]

Answer 4

0.1

Answer 5

\(\bf a^{-{\color{red} n}} \implies \cfrac{1}{a^{\color{red} n}}\qquad \qquad

\cfrac{1}{a^{\color{red} n}}\implies a^{-{\color{red} n}}
\\ \quad \\
% negative exponential denominator
a^{{\color{red} n}} \implies \cfrac{1}{a^{-\color{red} n}}
\qquad \qquad

\cfrac{1}{a^{-\color{red} n}}\implies \cfrac{1}{\frac{1}{a^{\color{red} n}}}\implies a^{{\color{red} n}}
\)

Answer 6

so does count as significant, and it is 1 digit

Answer 7

Thanks again

Answer 8

My last question is ames Street, QB 1968-69, led Texas to the National Championship in 1969. His 20 straight victories as a starter are still the best in SWC history. How many significant digits does 20 represent?
1. 1
2. 2
3. impossible to determine 4. 0
5. infinite

Answer 9

I know 20 has 1 digit, but how do i know is not a tricky question and they mean 20.00000 which has infinite digits

Answer 10

I meant 20 has 2 digits

Answer 11

You interpret 20 as 20 not 20.00000

Answer 12

And they're asking for the number of significant digits the number 20 has.

Answer 13

Decimals apply mostly with measurement. 20 in this case is the result of "counting" not "measurement".

Answer 14

Technically, counting is a form of measurement, but you wouldn't use decimals for counting whole numbers.

Answer 15

But if it was a measurement i would've being like 20.000..... right?

Answer 16

no, it was actually infinate

Answer 17

but what you're saying make sense

Answer 18

This is one of those "I believe button" type concepts because logically it doesn't make sense, at least not to me, but apparently, "Exact numbers have an infinite number of significant digits".

Answer 19

I would have picked 1 significant digit which would have been supposedly wrong.

Answer 20

Yeah, i get what you are saying, and it makes perfectly sense. On tuesday I will tell my teacher to explain me more about this. I think it is a tricky question

Answer 21

Thank you so much anyway

Answer 22

have a good weekend