HELP~ i dun understand!!!

• Jun 8th 2006, 07:24 AM
xiaoz
HELP~ i dun understand!!!
these question i dun understand.. and i dunno how to do.. can some 1 help plz.. question.. 2,3,4,5
• Jun 8th 2006, 09:48 AM
CaptainBlack
Quote:

Originally Posted by xiaoz
these question i dun understand.. and i dunno how to do.. can some 1 help plz.. question.. 2,3,4,5

2a $\displaystyle 530 \div 0.025=\frac{530}{0.025}$

multiply top and bottom by $\displaystyle 1000$:

$\displaystyle 530 \div 0.025=\frac{1000\times 530}{1000\times 0.025}=\frac{530000}{25}$

2b The cost of dinner is the price of the food plus a 4% service charge.

A diner paid $93.60, what was the price of the food? Let$\displaystyle \$x$ be the price of the food, then the diner pays:

$\displaystyle x+0.04x=1.04x=93.5$,

so:

$\displaystyle x=\frac{93.5}{1.04}$ dollars.

RonL
• Jun 8th 2006, 10:43 AM
ThePerfectHacker
3a.
The next number of the sequence is found by adding the previous ones. This is called fibonacci sequence.
• Jun 8th 2006, 10:49 AM
ThePerfectHacker
6a,
$\displaystyle 5<6x-13<7$
$\displaystyle 18<6x<20$
Divide by six,
$\displaystyle 3<x<3.333$

6b,
You have,
$\displaystyle \frac{7}{11}<x<\frac{8}{11}$
For example if,
$\displaystyle x=\frac{7.5}{11}$
But express it as a fraction,
$\displaystyle x=\frac{\frac{15}{2}}{11}=\frac{15}{22}$

6c,
You have,
$\displaystyle x^{2y}=5$
then cube both sides,
$\displaystyle x^{6y}=125$
Mutiply by 2,
$\displaystyle 2x^{6y}=250$
subtract by four,
$\displaystyle 2x^{6y}-4=246$