# Posts by EssKay

Total # Posts: 32

**math**

Hey Amy, any fraction is equal to one when the denominator and numerator are the same number.

*January 20, 2011*

**Biology**

""Those who believe that there is widely scattered evidence of 'modern' behavior going back 200,000 years in Africa will be delighted that modern human anatomy also goes back that far," said John Fleagle, a physical anthropologist at Stony Brook ...

*January 20, 2011*

**physics help**

Hey again Stan, hmm, okay, I'll keep playing with it, I still say we're missing info though... but re-post in the meantime, so other tutors don't think I've answered.

*January 20, 2011*

**physics help**

Hey Stan, is that a direct copy/paste? Ie that's all your were given word for word? Hoi.. I think my Physics is rusty.

*January 20, 2011*

**math help please!!**

A point of intersection is when the two equations equal each other. So set: log(x-2) = 1 - log(x+1) Then solve for x. Does that help, or are the logarithms themselves giving you trouble?

*January 20, 2011*

**Chemistry**

Hey Michael, A) For the first step you want to take the reactants from both the slow and fast steps and put them on the left of the arrow. And put all four products on the right side. Then cancel out anything that appears on both (Ex: NO2) Then make sure all your elements are ...

*January 20, 2011*

**algebra**

Okay, so your question is saying "At Least -6" Meaning you can't go any lower than -6, therefore x must be greater than or equal to -6. Second the question is saying "At Most 3". So x is smaller than or equal to 3. Right away you can eliminate c. Then ...

*January 20, 2011*

**algebra**

Looks like your copy/paste didn't work so well, some of those should probably be "Greater than or equal to (>=)" or "Smaller than and equal to (<=)". Repost?

*January 20, 2011*

**Calculus**

Hi Brittany, you're going to need a split function, one where t <= 0.35 and one where t > 0.35. a) When t <= 0.35 The information you have is: when t = 0, the quantity will also be zero. When t = 0.35 the quantity will be 0.3. Seems like this will be a linear ...

*January 20, 2011*

**math**

Scientific notation is when there is only one digit before the decimal, for example 314 can become 3.14 x 10^2 Use a positive power if the decimal should move to the right, negative if it should move to the left.

*January 18, 2011*

**geometry**

Two angles are complimentary if they add up to 90 degrees. So you can say that: (14q + 8) + (8q - 6) = 90 You can then rearrange the equation to solve for q. Then sub q back into the individual equations to calculate the angles.

*January 18, 2011*

**Math**

The formula for the surface area of a right circular cylinder is; SA = 2*pi*r*h + 2*pi*r^2

*January 17, 2011*

**Math**

The circumference of a circle is defined as: C = 2piR Remember that a diameter is twice the radius, so make sure to divide 10 by 2.

*January 17, 2011*

**MATH HELP**

What would make a slope undefined? A slope is defined as the change in y over the change in x. (Or vice versa). Hint: Anything divided by zero is undefined.

*January 17, 2011*

**geometry**

The perimeter of a square is four times the length of a side, so if we let x be the length of a side you can set up two formulas. Let's set P to be the perimeter. So P = 4x (by definition) and P = 7x - 12 Now you can use these two formulas to calculate x, by setting them ...

*January 17, 2011*

**Math**

I think there is a typo in your question. "She has to check in 2 h and 35 min". Is it she has to check in 2 hours early and it takes 35 minutes to get to the airport? If so, you want to add up all the time for travel and chit chat. So 2 hours + 35 minutes + 45 ...

*January 17, 2011*

**Math**

Yup, the circumference of a circle with radius r has the formula C = 2piR

*January 17, 2011*

**Math**

Hi there! What you want to do is start with 22.25, then add any amount that Megan receives, and subtract any amount she spends. The number you end up with is your answer :)

*January 17, 2011*

**Calc**

Hey Stephanie.. if I'm understanding correctly there's a typo, and you actually meant 'w and z are positive constants'? a) Hint: Look at a picture of a cosine graph and see what value of '14*pi*w*t' maximizes the value b) Hint: When is 2zcos(14piwt) ...

*January 17, 2011*

**Linear Algebra**

Hey Linus, First step: simplify where you can. For example, equation 3 can be divided by 5, so you end up with (x3) + 2(x4) + 3(x6) = 1. Equation 4 can also be simplified. This will make the algebra later a little easier. Second step: Pick an x (x1 seems to be a good one) to ...

*January 17, 2011*

**Physics**

Hint: This seems like a trick question ;) Percent uncertainty is usually just the uncertainty times by 100!

*January 17, 2011*

**algebra**

Joshua, it's always easiest to draw yourself a graph so you can understand the question. a) Set y as cat years, and x as human years. You should have a straight line when you're finished, on a diagonal. Any idea what the slope means now? b) Determine your slope using ...

*January 17, 2011*

**physics**

Hey there! Speed is defined as distance in metres, over time in seconds. So if a hare ran 40 metres in 2 seconds he would have a speed of 40/2 = 20m/s

*January 17, 2011*

**physics**

There's no one formula for maximum acceleration, it depends on the situation (velocity, type of motion etc). What is the full problem? Maybe I can help then.

*January 17, 2011*

**Math**

Oh! Okay, well anything to the negative power is equal to the reciprocal to the same positive power. Therefore; (x^-4*y^2/x^-2*y^-4)^-3 = (x^-2*y^-4/x^-4*y^2)^3 You can then multiply each exponent within the brackets by 3. And simplify your numerator and denominator from there...

*January 17, 2011*

**Math**

You've given us a formula, but not given us what we are supposed to be doing with it...

*January 17, 2011*

**Calculus**

Where are you stuck Ethan? Show me what you have so far and I'll point you in the right direction. Hint: Draw a graph for yourself, designate the x axis as miles and the y as dollars. So when x is 300 what is y? And when x is 600 what is y? This might help you understand ...

*January 17, 2011*

**physics**

Let Ff = Force of Friction Let C = Coefficient of Friction Let N = Normal force Ff = CN The required force to just get a block moving along at a constant velocity will also be equal to the force of friction (Ff) if there is nothing else acting on the horizontal plane. N can be...

*January 17, 2011*

**Maths**

Almost! You don't want any zeros on the left side of the *.

*January 17, 2011*

**Physics**

What have you done so far? Let me know where you're stuck and I can help.

*January 17, 2011*

**Physics**

Remember that energy is conserved, so Ek + Ep will always equal Etotal. What is your work so far? Let me know where you're stuck and I can help out.

*January 17, 2011*

**Physics**

Hint: It takes the same amount of time to go up, as it does down, so use 2.5 as t. And your only acceleration will be gravity acting downwards. Figure out a, and vi, then put them into one of your kinetic formulas and you should get your answer.

*January 17, 2011*

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