sleepthei

dP/dt = 5*rad(Pt)

I am not sure where to go with this one.

I tried representing the decimals in terms of fractions, then a few shifts but I can't get anywhere that makes sense to me.

Do I have to get it into the form ar^n-1?

I've tried expressing the exponents, like 1 / (2^.5)^n but I keep getting stumped.

t = -50 ln(2/3) = 20.27 is the supposed answer.

What logarithmic techniques are used to reach this solution

When I do it I get, 50/75 = 3/4 = e^(-1/50)t (By subtracting 20, then dividing by 75)

then apply the natural log to both sides, to get t = 14.384.

What

With all x on one side, all y on the other. (in the fashion ... dx = ... dy

(x^2 + 1) dy/dx = xy

Step by step please.

I am having difficulty filling in the blanks on how in EXAMPLE 3: on

http://tutorial.math.lamar.edu/Classes/DE/Repeated...

at the point of "Plugging in the initial conditions gives the following system of equations."

Where, A and B are constants.

Where, -1 = y(-4) = Ae^28 - 4Be^28

and 5 = y'(-4) = -7Ae^28 + 29Be^28

to get an answer of A = -9e^-28 and B= -2e^-28

How do I get here? Thanks so much.

'A' being a constant. These are also two separate questions.

IS product rule used?

k = ?

k = ?

Octane C8H18 is the primary element of gasoline. A car has a rated mileage of 20 mpg, what volume (L) of CO2 is produced when driven a distance 11.0 miles? Assume a temperature of 25.0 C and an atmospheric pressure of 1 atm and that the car only burns C8H18. The density of octane is 0.703 g/cm3. The volume of 1 mole of CO2 under the conditions is 24.5 liters.

The balanced equation is 2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O. How do I solve this?

I am having difficulty refreshing myself with these rules of algebra. Does anyone have the step by step process and possibly any online resources for getting myself acclimated.

How much energy in (kJ) must be removed in order to change

1.62 moles of water at 57.0 C to ice at -20.0 C

in a process that takes place a constant pressure of 1.0 atm ?

The specific heat capacity of solid water is 2.03 J g-1 C -1

I am thinking it revolves around the formula for heat but I cannot get past

the start. What is the answer to this dilemm?a

equation:

du/dt = 2 + 2u + t + tu

Step by step, if possible. Having all 'u' related elements (du and u) on one, and 't'

(dt and t) related elements on the other.

I am having difficultly placing the name of a television show that used to be on the Animal Planet. Here are the things I can recall (very little):

1) It was on early in the morning when I caught it and it didn't seem to be original content, perhaps from the UK.

2) It was a story and featured animal actors. For example there would be a toad, and a white rat and they performed while there was a narrator telling the story and speaking their voices. A show example would be fixing the boat or something.

3) It hasn't been on in a while.

2x - x^2 = (1/2)

I understand the answer is x = 1 - (rad(2)/2) but how is this obtained? The quadratic formula?

similarly in the case,

2x - x^2 = (3/4).

Definite Integral from 16,000 to 24,000 : (1/20) e^(-x/20) dx