Friday
December 13, 2013

# Posts by Katrina

Total # Posts: 190

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

Calculus (please help!!!)
Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter. h=______ w=______ What...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

Calculus
HI, Thanks for the explanation, that makes a lot of sense, I don't know why it didn't occur to me that mass can't be negative... but I typed those answers and I still get them both wrong... I don't know why...

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the quant...

precalculus
For the Function, y= x(x-4)(x+8) Y-intercept is: X-intercept is:

Chemistry
Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? -Thanks

precalculus
Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?

precalculas
The doubling period of a baterial population is 20 minutes. At time t=100 minutes, the baterial population was 80000. What was the initial population at time t=0? Find the size of the baterial population after 4 hours.

precalculas
the amount of bacteria in a petri dish increased by a percent change of 12% each hour over a period of 15 hours. a. find the growth factor for 1 hour? b. by what total percent did the bacteria change during this 15- hour time period.? c. how long will it take for the bacteria ...

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