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Word problem

George has decided that a distribution of data is cubic, that is it has the general form of a function "f(x)=x^3" if the point on the curve that should be at (0,0) is found at (-3,7) and the point that should be at (1,1) is at (-2,11). What is the equation of the data distribution (hint: sketch f(x)=x^3 and the points (-3,7) and (-2,11). What has been done to the original curve?

Subject:

Math

Topic:

Algebra

Posting ID:

2768

OTA ID:

102827

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Solving equations

For the equation, 5r-3s=24 and 3r+5s=28 solve for r and s by 1. substitution 2. elimination 3. matrix methods (except Cramer's rule) 4. Cramer's rule 5. Graphically

Subject:

Math

Topic:

Algebra

Posting ID:

2770

OTA ID:

102827

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Word problem dealing with current and circuits.

When the switch is closed in the circuit below, the current begins to build up according to the equation: I=E/R[1-e^-(R/L)t] where I is current in amps, t is Time in seconds E is voltage R is resistance in ohms and L is inductance in henrys V=9volts R=10 ohms L= 20 henrys has an on/off switch a) What is the maximum current in the circuit? (hint: this value, called steady state happens at very large values of t) b) How much current is flowing 0.50 seconds after the switch is closed? c) At what time will the current be exactly 1/2 of the maximum value?

Subject:

Math

Topic:

Algebra

Posting ID:

2775

OTA ID:

101262

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Determining the solution to a function of a function.

If f(x)=2x^2+3 and g(x)=x+7 what is: f(g(x))? g(f(x))?

Subject:

Math

Topic:

Algebra

Posting ID:

2783

OTA ID:

102850

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Logs

lnx+ln(x+2)=4 3^x=45 x=log17 96 I did not know how to put the 17 lower than the log lnx for x=e^x f(6) for x^2+3x-2/x^2-6x=f(x)

Subject:

Math

Topic:

Algebra

Posting ID:

2784

OTA ID:

101298

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