Hello,

you have

I've attached the graph of this function.

From the grap you can see: The domain is . According to the wording of this problem the 4 doesn't belong to the domain.

The range is

There is one zeroat

EB

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- Nov 27th 2006, 11:04 PMearboth2nd attempt
- Nov 27th 2006, 11:16 PMearboth
Hello,

let x be the amount of the 2%-solution

let y be the amount of the 12%-solution

Then you get 2 simultanous equations:

A: x+y=150

B: 0.02*x+0.12*y=0.08*150=12

Multiply the equation B by 50 and calculate 50*B-A:

5y=450. Thus y = 90. Plug in this result into A. You'll get x = 60.

EB - Nov 27th 2006, 11:48 PMearboth
- Nov 28th 2006, 02:57 AMearboth
Hello,

to 21.)

Thus the exact solutions are:

Approximate resultes: x = -2.8 or x = -7.3

to 22.)

A produkt is zero if one of the factors is zero. Thus you'll get the solutions: x = -3 or x = 8

to 23.)

Use the formula you know to solve this equation:

. Thus x = 4 or x = -3/2

to 24.) Multiply denominator and numerator with the conjugated(?) value of the denominator:

EB - Nov 28th 2006, 07:11 AMearboth