Monday

February 20, 2017
Total # Posts: 1,399

**Math**

The sides of a square are all increased by 3 cm. The area of the new square s 64 cm^2. How can you find the length of a side of the original square?

*April 30, 2009*

**Math**

ok thanks..

*April 30, 2009*

**Math**

how do you factor 4x^2-35x-9=0?

*April 30, 2009*

**Science**

thank you!

*April 30, 2009*

**Science**

When it's winter in the northern hemisphere, it's summer in the southern hemisphere. So, if it's April in the northern hemisphere, is it still April in the southern hemisphere?

*April 30, 2009*

**Science**

If Earth's axis had no tilt, we'd only have spring and fall for seasons, right? But which hemisphere would get the vernal equinox and which would get the autumnal?

*April 29, 2009*

**Math**

I don't think there is any factor that can be multipl;ied by 2 to get -7..

*April 28, 2009*

**Math**

how do you factor 2c^2-7c=-5? I know that you have to change it to 2c^2-7c+5=0. Then you do this: (2c )(c ). But how do I find the two numbers? I can't think of one that works..

*April 28, 2009*

**Math**

thank you

*April 27, 2009*

**Math**

Mike and Kim invest $8,000 in equipment to print yearbooks for schools. each yearbook costs $5 to print and sells for $25. How many yearbooks must they sell before their business breaks even? a. 1,600 b. 400 c. 320 d. 600 I know the answer is b, but I don't know how you ...

*April 27, 2009*

**Math**

thank you

*April 25, 2009*

**Math**

How can you match a parabola to it's graph? I know that in y=ax^2+bx+c, the a tells you if it opens upwards or downwards, and the c tells you the y-intercept..is there anything else?

*April 25, 2009*

**Math**

Never mind, I got it.

*April 25, 2009*

**Math**

I'm graphing the parabola f(x)=x^2+2. I'm going to make a table of values, and I'm choosing 5 values. How do I know which value I should choose as my 3rd value so I can make the parabola symmetrical?

*April 25, 2009*

**math**

copy and complete input-output table for the function y=2x - 5

*April 23, 2009*

**Math**

never mind, i get it, i wasn't supposed to solve any equations at all..

*April 23, 2009*

**Math**

Suppose you buy flour and cornmeal in bulk to make flour tortillas and corn tortillas. Flour costs $1.50/lb. Cornmeal costs $2.50/lb. You want to spend less than $9.50 on flour and cornmeal, and you need at least 4 lb altogether. Write a system of inequalities that describes ...

*April 23, 2009*

**science**

oh, so it's d. cuz only plants do that..thanks

*April 22, 2009*

**science**

I don't know..

*April 22, 2009*

**science**

all of the following are life functions of animals except? a. obtaining energy from food b. responding to changes in the environment c. production of new individuals d. synthesizing food from carbon dioxide and water I think it's b.

*April 22, 2009*

**science**

what would make it sink halfway down?

*April 22, 2009*

**science**

thanks, but can you explain my second question?

*April 22, 2009*

**science**

why doesn't density depend on size? If you cut a block in half, and put it in water, wouldn't the density change because I think half a block wouldn't sink all the way in water?

*April 22, 2009*

**Math**

i get it..thanks!

*April 20, 2009*

**Math**

You have a total of 21 coins, all nickels and dimes. The total value is $1.70. Write and solve a system of equations to find the number of dimes d and the number of nickels n that you have. I already wrote the equations: n+d=21 and 10d+5n=1.70. But I don't know how to ...

*April 20, 2009*

**8th grade Algebra**

how u get -b?

*April 17, 2009*

**History**

Maybe another thing could be that it costs a lot of money for all the weapons?

*April 17, 2009*

**Algebra**

12+6x<30+4x+8 6x-4x<38-12 2x<26 x<13

*April 17, 2009*

**Science**

How much of a radioactive material with a half-life of 12,000 years is left after 36,000 years of decay?

*April 17, 2009*

**Science**

thanks

*April 16, 2009*

**Science**

for the most of the Jurassic Period, were there coral reefs?

*April 16, 2009*

**Science**

there are 6: lever, inclined plane, wheel and axle, screw, wedge, and pulley

*April 16, 2009*

**Science**

ok thanks

*April 15, 2009*

**Science**

Why two half-lives?

*April 15, 2009*

**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

*April 15, 2009*

**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?

*April 15, 2009*

**Chemistry/math**

ok thanks

*April 15, 2009*

**Chemistry/math**

why is it to the -1?

*April 15, 2009*

**Chemistry/math**

0.0231?

*April 15, 2009*

**Chemistry/math**

what does k stand for?

*April 15, 2009*

**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?

*April 15, 2009*

**Math**

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

*April 15, 2009*

**Math**

commutative property

*April 15, 2009*

**Math**

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

*April 15, 2009*

**Math**

thanks

*April 15, 2009*

**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?

*April 15, 2009*

**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?

*April 15, 2009*

**Math**

thanks

*April 14, 2009*

**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)

*April 14, 2009*

**unit rate**

isn't it 23 dollars/hour?

*April 14, 2009*

**unit rate**

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

*April 14, 2009*

**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...

*April 14, 2009*

**Math**

thank you

*April 14, 2009*

**Math**

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

*April 14, 2009*

**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?

*April 14, 2009*

**Math**

thanks

*April 14, 2009*

**Math**

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

*April 14, 2009*

**Math**

thanks

*April 14, 2009*

**Math**

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

*April 14, 2009*

**Math**

thanks

*April 14, 2009*

**Math**

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

*April 14, 2009*

**Math**

but how do you set it up as simultaneous equations?

*April 14, 2009*

**Math**

what do you mean by simultaneous equations?

*April 14, 2009*

**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...

*April 14, 2009*

**Math**

why do you think it's d?

*April 14, 2009*

**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}

*April 14, 2009*

**Math**

thanks

*April 14, 2009*

**Math**

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

*April 14, 2009*

**Math**

omg, sorry for all those spaces!

*April 14, 2009*

**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)

*April 14, 2009*

**language**

isn't it supposed to be "breathes"?

*April 14, 2009*

**Math**

thanks

*April 13, 2009*

**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?

*April 13, 2009*

**Math**

thanks

*April 13, 2009*

**Math**

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

*April 13, 2009*

**Math**

thank you!

*April 11, 2009*

**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?

*April 11, 2009*

**math**

on second thought, it's undefined.

*April 11, 2009*

**Math**

thanks

*April 11, 2009*

**Math**

so it's not undefined?

*April 11, 2009*

**Math**

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

*April 11, 2009*

**math**

2/7 = 6/21

*April 11, 2009*

**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?

*April 11, 2009*

**Math**

never mind, i got that too.

*April 11, 2009*

**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?

*April 11, 2009*

**Math**

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

*April 11, 2009*

**Math**

I got y=-3x+29. thanks

*April 11, 2009*

**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)

*April 11, 2009*

**Math**

ok then

*April 11, 2009*

**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?

*April 11, 2009*

**Math**

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

*April 11, 2009*

**Math**

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

*April 10, 2009*

**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)?

*April 10, 2009*

**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 ...

*April 10, 2009*

**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?

*April 10, 2009*

**math**

thank you!

*April 10, 2009*

**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 ...

*April 10, 2009*

**Social Studies**

thanks

*April 9, 2009*

**Social Studies**

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

*April 9, 2009*