Wednesday
July 30, 2014

Posts by Angie


Total # Posts: 1,166

Science
ok thanks

Science
Why two half-lives?

Science
A material has 32 atoms in all; 24 decayed and the rest undecayed. If the half-life of the radioactive material is 1000 years, what is the age of the material? a. 1000 years b. 2000 years c. 3000 years d. 4000 years

statistics
Flaws in a carpet tend to occur with a Poisson distribution at a rate of one flaw every 300 square feet. What is the probability that a carpet that is 9 feet by 14 feet contains no flaws? Probability = how would you set it up in excel?

Chemistry/math
ok thanks

Chemistry/math
why is it to the -1?

Chemistry/math
0.0231?

Chemistry/math
what does k stand for?

Chemistry/math
Cesium-137 has a half-life of 30 years. Suppose a lab stored a 30-mCi sample n 1973. How much will be left in 2063?

Math
You deposit $200 into an account earning 5%, compounded monthly. How much will be in the account after 2 years?

Math
commutative property

Math
why are the two formulas for finding compund interest: B=p(1+r)^x and y=a*b^x acually the same?

Math
thanks

Math
Suppose your parents deposited $1500 in an account paying 3.5% interest compunded annually(once a year) when you ere born. Find the account balance after 18 years. So how do you plug all this information into this formula: B=p(1+r)^x?

Math
Suppose your parents deposited $1500 in an account paying 3.5% interest compunded annually(once a year) when you ere born. Find the account balance after 18 years. So how do you plug all this information into this formula: B=p(1+r)^x?

Math
thanks

Math
Suppose your community has 4512 students this year. The student population is growing 2.5% each year. Write an equation to model the student population. (y=a*b^x)

unit rate
isn't it 23 dollars/hour?

unit rate
You divide 88 by 4, and you get 22 students per class.

Math
This is a continuation: Hannah's average speed for the remainder of the trip to her cousin's house was 40 miles per hour. How long, in hours, did it take her to drive the remaining difference? I got 33.3 mph by dividing 40 by 1.2, but i'm not sure if i'm right....

Math
thank you

Math
All I know is that it took her 1.2 hours to get halfway to her cousin's house.

Math
Hannah took a trip to visit her cousin. She drove 120 miles to reach her cousin's house and the same distance back home. What was her average speed, in miles per hour, for the first 1.2 hours of the trip?

Math
thanks

Math
is a horizontal line on a graph a function? I think it is.

Math
thanks

Math
What would be the x-intercept of y=-|x-3|? I think it would be -3.

Math
thanks

Math
well, i got x=-8, so the answer should be c?

Math
but how do you set it up as simultaneous equations?

Math
what do you mean by simultaneous equations?

Math
The equations 5x+2y=48 and 3x+2y=32 represent the money collected from school concert ticket sales during two class periods. If x represents the cost for each adult ticket nd y represents the cost for each student ticket, what is the cost for each adult ticket? a. $20 b. $10 c...

Math
why do you think it's d?

Math
Which interval notation represents the set of all numbers from 2 through 7, inclusive? a. (2,7} b. (2,7) c. {2,7) d. {2,7}

Math
thanks

Math
Which expression represents (2x^3)(8x^5)/4x^6? I think it's 4x^2.

Math
omg, sorry for all those spaces!

Math
Suppose your community has 4512 students this year. The student population is growing 2.5% each year. Write an equation to model the student population. (y=a*b^x)

language
isn't it supposed to be "breathes"?

Math
thanks

Math
If I were to graph 20a+34b is greater than or equal to 240, which would be the easier way: graphing it by finding the x and y intercepts, or graphing it by finding the slope and y-intercept?

Math
thanks

Math
How do you know if the relationship shown by the data in a table is linear?

Math
thank you!

Math
if you were to graph x=5, how would it look like? And where can I find an online graphing calculator? and what does it mean in math for something to be undefined? What exactly is x=5? is it a function or something?

math
on second thought, it's undefined.

math
3.

Math
thanks

Math
so it's not undefined?

Math
Why is it not possible to write the equation of the line through (8,-5) and (-8,-9) in slope-intercept form??

math
2/7 = 6/21

math
when you're looking at a graph that shows the height of a balloon over time, how can you know the rate in which it rises?

Math
never mind, i got that too.

Math
Never mind, I already got it: y + 1 = 5/6 9x + 2). Now how do you rewrite this equation in standard form using integers?

Math
A line passes through (2,-1) and 8,4). How do you write an equation for the line in point-slope form?

Math
I got y=-3x+29. thanks

Math
What are you supposes to do to write the equation of a line that is perpendicular to the given line and that passes through the given point: 4x-12y=2; (10,-1)

Math
ok then

Math
I think a parabola can have 2 x-intercepts..then is there a graph of a function where there's no x-intercept at all?

Math
Can a graph of a function ever have more than 1 x-intercept?

Math
thanks..in your opinion, is the way you did easier than doing it with point-slope form?

Math
How are you supposed to write an equation for the line that is parallel to the given line and that passes through the given point? For ex., what do you do for y = 3/4 x - 9, (-8,-18)?

social studies
"According to Wikipedia, there are twenty-two official languages in India. Also from the Wiki article: "Individual mother tongues in India number several hundred (SIL Ethnologue lists 415), and 24 languages are spoken by more than a million native speakers, 114 by mo...

math
by the way, which way do you think is easier: Finding the intercepts(like above), or rearranging the inequality and graph it by knowing the slope and y-intercept?

math
thank you!

math
Suppose you need $2.40 in postage to mail a package to a friend. You have 9 stamps, some $0.20 and some $0.34. How many of each do you need to mail the package? So to solve this problem, I came up with two inequalities: 1. a + b is less than or equal to 9 2. 20a + 34b is great...

Social Studies
thanks

Social Studies
I'm writing an essay on fashion in the 1960s. What are subtopics I should write about?

science
oh ok

science
then what is it supposed to be, reptiles?

science
Which life-form was most abundant 250 million years ago? a. dinosaurs b.reptiles c.bony fishes d.trilobites I think it's d.

7th grade
oops, sorry, i posted for the wrong thing.

7th grade
well, repeating decimals just keep on repeatin, like 0.0666...the 6 just keeps on repeating. or like .063490634906..the 06349 keeps on repeating. terminating decimals end, like 0.75. or 025. or 0.125

1st grade
yes

1st grade
yeah, but the correct way to write it would be: He doesn't want to read Snow White.

science,details about fish HELP PLS!!!!!!!!
answer to 1st q: eating, pets, animals they eat would be over populated answer to second q: animals they eat would be over populated answer to third q: end overfishing answer to 4th q: (got this from internet)The overfishing of a particular species does not just damage the pop...

math
oh, i remember now, thanks

math
linear equations parallel to each other have same slope. what about perpendicular lines??

Social Studies
1. a warehouse,especially if the manufacturer owns the space. 2.Support structures that aid in the force or power needed to drive the machines used in production 3. Dams that help to generate power for the factory operation

4th grade
just type "how to make a medieval castle model" on google.

6th grade math
well, repeating decimals just keep on repeating, like 0.0666...the 6 just keeps on repeating. or like .063490634906..the 06349 keeps on repeating. terminating decimals end, like 0.75. or 025. or 0.125

6th grade math
i found this: Surface Area of a Rectangular Prism = 2ab + 2bc + 2ac (a, b, and c are the lengths of the 3 sides) In words, the surface area of a rectangular prism is the are of the six rectangles that cover it. But we don't have to figure out all six because we know that t...

math
-2y=-3x+12 y=2/3x-6 so, slope is 2/3, y-intercept is -6.

math
1. y=3/2x+7 so the equation is y=-2/3x+7 sorry, not sure about 2nd question

french
thanks

french
can "avoir sommeil" mean to be tired?

french
what does "avoir" mean?

science
thanks

science
Scientists believe that Earth's early atmosphere changed in composition as a result of a. the appearance of oxygen-producing organisms b. the drifting of the continents c. the changes in Earth's magnetic field d. a transfer of gases from the Sun

Help me expand my paper PLEASE
how many subtopics do you need?

math
thanks

math
When you write 4x-6y is greater than or equal to 16 in slope-intercept form,is the answer y is less than or equal to 2/3x + 8/3?

Math
thanks

Math
why is it that in a linear inequality, each point on a dashed boundary line is not a solution?

physics: true or false
you got the second one right.

6th grade math
If the number was positive, then you subtract. If the number was negative, then you add. Basically, just do the opposite..

science
..what does that mean?

science
how old is a mammoth's tusk if there is only 25 percent C-14 remaining in the sample? a.5700 years b.11400 years c.17100 years d.22800 years

science
thanks

science
Which statement best explains why dating geologic materials from the Quarternary Period uses a different radioactive isotope than for materials from the cambrian Period? a. all rocks contain radioactive substances. b. some isotopes decay faster than others. c. not all isotopes...

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