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Tyler W.

Chemistry Major/ Pre-Med

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Basic Math

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Question:

Bill purchases a bicycle for $20.99 at a local store and is charged 5% sales tax on the bicycle. How much did bill pay?

Tyler W.

Answer:

So you can do this problem two different ways. First you could find 5% of $20.99 and then add it to $20.99 like this, 20.99 x .05 = $1.0495 remember to round to the nearest .01. 20.99 + 1.0495= 22.0395 rounds to $22.04 The second way you could do it is by finding what 105% of $20.99 is. 20.99 x 1.05 = 22.0395 rounds to $22.04.

Basic Chemistry

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Question:

The number of moles solute in 1 kg of solvent is known as? a) molality b) molarity c) formality d) mole fraction

Tyler W.

Answer:

Molality = moles solute/ kg solvent Molarity= moles/L Formality= Moles solute/ L solvent Mole Fraction= Moles solute or solvent/ total moles

Algebra

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Question:

5x^2-3x+3=0 Solve for x.

Tyler W.

Answer:

The equation you are looking at is a quadratic equation, and you are asked to solve for x. In order to solve this problem you would have to know the quadratic formula. Ax^2+Bx+C=0 to Solve you would replace A, B, and C with the given values in your equation. -b + or - the square root of b^2 - (4)(a)(c) all divided by 2(a). You will need to solve it for both + and -. This will give you two answers. (-(-3)+ the square root of (-3)^2-4(5)(3))/2(5) = (-(-3)- the square root of (-3)^2-4(5)(3))/2(5) = If you work these numbers you should get the right answer.

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