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Hannah R.
Pre-vet/Biology major and Work Study Tutor in College
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Basic Math
TutorMe
Question:

What is 83/1000 as a decimal?

Hannah R.

An easy trick to this is starting out by thinking of 83 as 83.0 If we divide this by 1000 then we are moving that decimal to the left 3 places because 1000 has 3 zeros. Since there are only 2 numbers there (8 and 3), we need to put a 0 in front of the 8. When we move the decimal place, we get the final answer: 0.083

Biology
TutorMe
Question:

What is a species and how do can scientist tell if they found a new species or a species that has already been discovered?

Hannah R.

There have been many different definitions of species, but the best one we have is called the Biological Species Concept. According to this, a species is a group of organisms that can produce viable, fertile offspring. Basically, an organism is a new species if it can't mate with other species. This is tested with 8 reproductive barriers. Scientist test if they have found a new species by comparing it to similar organisms and asking these questions in this order: 1. Does it live in the same habitat? 2. Is it active at the same time? 3. Does it like or practice the same behaviors? 4. Can they physically mate? 5. Can their genetic material form a zygote? 6. Will the zygote survive in the womb? 7. Is the offspring created fertile? 8. Is the offspring created viable (able to survive and mate)? If the answer to any of these questions is no, then they have found a new species.

Algebra
TutorMe
Question:

Evaluate f(2) - f(1) where f(x) = 6x + 1

Hannah R.

We first want to start out by finding what f(2) and f(1) are. To find f(2) we use f(x) = 6x +1 and every place there is an x, replace it with a 2. so f(2) = 6(2) + 1. Simplify the expression by multiplying the number first so you have f(2) = 12 + 1. Then add to get f(2) = 13. Now we need to find f(1). We use the same method as before, replacing x with the number in parentheses so f(1) = 6(1) + 1. Multiply first to get f(1) = 6 + 1. Then add to get f(1) = 7. Now that we have f(2) and f(1) we can now solve f(2) - f(1). Since f(2) = 13 and f(1) = 7, then f(2) - f(1) = 13 - 7. By subtraction we find that 13 - 7 = 6 so the solution is 6.

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