# Posts by angie

Total # Posts: 1,409

**Math**

thanks

**Math**

A math class has 25 students. There are 13 students who are only in the band, 4 students who are only on the swimming team, and 5 students who are in both groups. How many students are not in either group? I think it's 3 students?

**French**

thank you

**French**

is this correct too? this is what i ended up writing: La matière la plus utile est les sciences.

**French**

In French, how do you say "The ost useful subject is science? I need to know how to say the science part..is it plural, like math, and is it masculine or feminine?

**French**

thanks

**French**

yeah, that's the one! i remember now thanks

**French**

is there another way?

**French**

how do you say "subject" in french? I think there's one way to say it that starts with an m?

**Math**

the ways above is probably easier, but my teacher probably wants me to solve it by factoring..

**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?

**Math**

ok thanks..

**Math**

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

**Science**

thank you!

**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?

**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?

**Math**

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

**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..

**Math**

thank you

**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 ...

**Math**

thank you

**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?

**Math**

Never mind, I got it.

**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?

**math**

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

**Math**

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

**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 ...

**science**

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

**science**

I don't know..

**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.

**science**

what would make it sink halfway down?

**science**

thanks, but can you explain my second question?

**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?

**Math**

i get it..thanks!

**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 ...

**8th grade Algebra**

how u get -b?

**History**

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

**Algebra**

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

**Science**

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

**Science**

thanks

**Science**

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

**Science**

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

**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