Does not make that much sense this.....

Thankyou so much you could see the picture????

I can send it to you

I think of it as the ability tp explain complex situtions...

\(\frac{4-2.4}{3.5-2.4}=\frac{311-240}{x-240}\)

First symplify the second equation

\(\frac{311-240}{x-240}= \frac{71}{x-240}\)

\(\frac{4-2.4}{3.5-2.4}=\frac{71}{x-240}\)

Apply the fraction cross multiply method

\((4-2.4)(x-240)=(3.5-2.4) * 71\)

Symplify the first equation

\((4-2.4)(x-240)\)\(= 1.6(x-240)\)

\(1.6(x-240) = (3.5-2.4)*71\)

Now symplify the second equation

\((3.5-2.4)*71 = 71 * 1.1 = 78.1\)

\(1.6(x-240) = 78.1\)

Multipy both sides by 10

\(10 * 1.6 (x-240) = 78.1 * 10\)

\(16(x-240) = 781\)

Then divide both sides by 16

\(\frac{16(x-240)}{16}=\frac{781}{16}\)

Symplify

\(x-240 = \frac{781}{16}\)

Now add 240 to both sides

\(x-240+240= \frac{781}{16}+240\)

\(x = \frac{4621}{16}\)

Hope this helps ;P

(8z − 9)(8z + 9) = az2 − b

First you must swich sides:

az * 2 - b = (8z - 9) (8z + 9)

Add b to both sides

az * 2 - b = (8z - 9) (8z + 9)

az * 2 - b + b = (8z - 9) (8z + 9) + b

Then symplify

az * 2 = (8z - 9) (8z + 9) + b

Then divide both sides by z * 2

\(\frac{az*2}{z * 2}\) \( = \frac{(8z - 9)(8z + 9)}{z*2}+\frac{b}{z*2}\)

Then symplify

\(a = \frac{(8z-9)(8z+9)+b}{2z}\)

Hope this helps ;P