# Tutor profile: Reem M.

## Questions

### Subject: Basic Math

Please find the value of X. 5x-7=3x+3

When solving equations it is always important to identify like-terms. In this particular example, both 5x and 3x are like terms and -7 and 3 are like terms. Always keep in mind the sign in front of the coefficient. Once we identify like terms we want to combine them together. Therefore, we subtract 3x from each side and we are left with 2x-7=3. Then we want to move all the x terms to one side and everything else to the other. Next, we add 7 to both sides and we are left with 2x=10. We have finally isolated X. Now to complete solving for X we divide each side by 2 leaving x=5.

### Subject: Biology

Color blindness is an X-linked recessive trait. If a carrier mother and a color blind father have two children, then what is the probability that both the children will be male and both of them would be color blind? a)50% b)25% c)6.25% d)12.5%

The correct solution for the above question is C, 6.25%. For any genetics question, it is important to start with a Punnett square. First off, the probability that a child will be male is 0.5 or 50%. The probability of a male child being colorblind is also 0.5 or 50%. We can see this using the Punnett square. The carrier mother genotype: XCXc and the colorblind father genotype XcY. Once you cross the progeny will be: XCXc, XcXc, XcY, XCY. Since the question asks for "and" we have to apply the product rule. Since we need to find BOTH the children being male and color blind, 0.5 x 0.5 x 0.5 x 0.5 = 0.0625 or 6.25%.

### Subject: English

One of the ____ tennis players to reach 20 grand slams was Roger Federer. a)first to b) first was c) first d) first has

The answer to the above question is C. One of the first tennis players to reach 20 grand slams was Roger Federer. Firstly, it does not make sense to have a preposition after the word "first". Secondly, having the words "was" and "has" does not make grammatical sense or add any logical meaning to the sentence. Therefore C is the best option.

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