Jessie

Hello.

i have a Macbook pro. i purchased it from ebay where the seller said he installed windows from a cd.

i want to return it to back to mac os .

however when i put the macbook mac os x install disc 1 and then turn on computer. i held down control C. but only a white screen shows. it does not go beyond that. i held on for 15min straight no response only a white screen. what can i do?

(5 / x-7) - (3 / x+3) + 3x-21 / (x^2 -4x - 21)

(√8 - √3 ) / (√15 + √10)

Grading :

participation and attendance = 25%

exam 1 = 20%

exam 2= 25%

final exam = 30%

for exam 1 i got an 80/100

how do i calculate? how much do i need to get in exam 2 and final exam to get at least a 85/100

please explain i want to learn. Im really bad in math.

the density of sulfur vapor at 1000 C and 740mm pressure is 0.5977g/l.

a) what is the molecular weight of the sulfur vapor?

b) what is the molecular formula of the sulfur vapor (atomic weight : S=32)

i figured out a) 64.3g/mole

how do i figure out b? the molecular formula.

please help

thank you

My aunt Tara has the whole family for thanksgiving dinner. Our family is large and there are 20 people who come for dinner. 12 family members like pumpkin pie and 10 like apple pie. Five like both kinds of pie. How many family members do not like pie at all?

can someone explain to me how to solve this problem..

thank you

Convert 2.5 DKM to Cm

My answer:

2.5DKM * 10m/1dkm * 1cm/10^-2m

i got : 2.5*1cm/10^-2

how do i get the final answer..

i forgot what i have to do with the numerator to get bring the 10^-2 up

can someone explain how?

thank you!

If one card is randomly selected from a standard 52-card deck, what is the probability of:

1) selecting a King or a Jack

2) selecting a number

3) selecting a picture card (jack, king, queen)

4) selecting a picture card or a red ten

5) selecting a number or a Queen i) not selecting a number

A fair coin is tossed two times in succession. Find the probability of getting:

a) two tails b) at least one tail c) a head on the first toss

hi.

where can i find bedding like the picture below such as the pillows, bed skirt and comforter?

http://site.home-and-bedroom.com/uploaded_images/a...

X/3 = X-6/7 =2/5

In a microscope, if the field of view increases what happens to the resolution and magnification? and why? and how does one make it clearer.

Shana's sister does not practice as much as ______.

1) her

2) she

3) me

is it she? if so why?

i have explain what i must do to both side of the first equation to obtain the second equation.

x+4y=2

2x= -8y + 4

for this one i got 0=0 i do not understand why

7d+1=4p

21d = 12p - 3

this one i had a hard time trying to solve

if someone knows please help.

The label on a bottle of Emetrol ("For food or Drink indiscretions")

Each 5 mL teaspoonful contains glucose, 1.87; Levulose,1.87; and phosphoric acid , 21.5mg

Find the amount of glucose in the recommended dosage of 2 teaspoons

How do i do this?

Each day, the number of births in the world exceeds the number of deaths by 229 thousand .

The combined number of births and deaths is 521 thousand.

Determine the number of births and the number of deaths per day.

how do i solve?

in 2000, the population of Greece was 10,600,000 with projections of a population decrease of 28,000 people per year.

In the same year, the population of Belgium was 10,200,00, with the projections of a population decrease of 12,000 people per year.

According to these projections, when will the two countries have the same population?

what will be the population at that time?

there's this bar graph that shows the number of American without health insurance from 2000 through 2003 :

in 2000 the number of people without health insurance is 39.8 million

in 2001 the number of people without health insurance is 41.3 million

in 2002 the number of people without health insurance is 43.4 million

in 2003 the number of people without health insurance is 44.9 million

in 2000, there was 39.8 millions Americans without health insurance. this number increased at an average rate of 1.7 million people per year. use this description to solve ;

the question :

determine when the number of Americans without health insurance will exceed the number in 2003 by 8.5 million

how do i solve? where do i begin ?

i have a graph it shows the average writing scores for high school seniors

for girls

on 1998 the average writing score was 159, in 2002 it was 160

for boys

on 1998 the average writing score was 140, in 2002 it was 136

the data can be modeled by the following formula:

Girls: W = 1/4 x + 159

Boys: W = -X+140

the question:

if current trends continue, when will the average test score for girls be 49 points higher than for boys?

if anyone knows please help

thank you

3X/5 - X = X/10 - 5/2