Tuesday

September 27, 2016
Total # Posts: 44,101

**Math**

The bill for x + 1/4 miles is .75 + .35x <= 7.40

*August 31, 2016*

**Math**

105 cannot be their least common factor, as it has its own smaller factors. Though I think the question has been garbled, since I cannot understand "two pairs of numbers of 105"

*August 31, 2016*

**biology**

surely you know what "complex" means and also the molecular level, as opposed to the more large-scale aspects. You know about molecules, right? So, given those ideas, and a little thought (and maybe some help from google) what do you think?

*August 31, 2016*

**linear algebra - can't grok**

your economy of typing (laziness?) makes your posting almost unintelligible. We don't mind helping you find the answers, but don't ask us to figure out the questions as well, ok? and what the heck is a signal lac?

*August 31, 2016*

**math**

24 students makes 12 pairs. There are 3 pairs to go. So, how many magnets is that?

*August 31, 2016*

**Math**

.30x = 90

*August 31, 2016*

**geometry**

how are the angles arranged? That is, what is the order of D,F,G,H around point E? Are there any right angles or straight angles in the picture?

*August 31, 2016*

**math**

yes

*August 31, 2016*

**Math**

7x1=7 7x2=14

*August 31, 2016*

**Biology **

Explain the following statement: "life is complex on a molecular level. How is your environment different from the biosphere?

*August 31, 2016*

**Math**

multiply all the powers by 4. 2^4 = 16

*August 31, 2016*

**Math**

two points cannot intersect B is also false, since the sign of the y-values are not both positive. This whole question appears bogus.

*August 31, 2016*

**Math**

If they lost x, then x + 2x+15 = 78

*August 31, 2016*

**Math**

(8/5) * 40

*August 31, 2016*

**Algebra 1**

5 more than x: x+5 5 more than (half Karen's salary): (k/2)+5 Your answer is half of (5 more than Karen's salary).

*August 31, 2016*

**Algebra 1**

correct

*August 31, 2016*

**Algebra help**

I like D!

*August 31, 2016*

**Algebra help**

oh, and speed is not measured in feet. Distance is measured in feet. Speed is measured in feet per second miles per hour or something else like that

*August 31, 2016*

**Algebra help**

I think so. speed depends on time and distance. None of the answers really is complete, but they all say something depends on something else. For a given distance, speed depends on the time it takes to travel that distance. So, if you want to determine Andy's speed, ...

*August 31, 2016*

**Algebra help**

speed = distance/time

*August 31, 2016*

**Math**

Draw a number line. You will see that -5 is to the right of -8. So, -5 > -8 and yes, -6 < |-8| = 8

*August 31, 2016*

**Mathematics**

yep

*August 31, 2016*

**Math**

Draw any convex polygon of n sides. From any vertex, there are n-1 other vertices to reach. But two of those are adjacent, so a joining line is just a side. That leaves n-3 other vertices. Joining to them will form diagonals.

*August 31, 2016*

**math work**

as long as we're using determinants, u•v×w = |9 -7 -3| |-6 1 -5| |2 8 -9|

*August 31, 2016*

**math work**

see related questions below

*August 31, 2016*

**Math**

maybe it's 7/12, since 1/3 + 1/4 = 7/12

*August 31, 2016*

**Science**

v^2 = 2as, so 25 = 10a a = 2.5 m/s^2 F = ma = 1.25N

*August 31, 2016*

**math**

9 1/4 - 15 2/6 = -(15 4/12 - 9 3/12) = -6 1/12

*August 31, 2016*

**math**

5 4/12 - 3/12 = 5 1/12

*August 31, 2016*

**math**

well, the chance that both are girls is 8/14 * 7/13

*August 31, 2016*

**Math**

rice: 11/18 tomatoes: 3/7 * 7/18 = 1/6 spinach: 1/4 * 2/9 = 1/18 1 - 11/18 - 3/18 - 1/18 = 3/18 so, 1/6 of the field is yams

*August 31, 2016*

**math**

88/2 = 44 44/2 = 22 22/2 = 11 2^3 * 11 = 88

*August 31, 2016*

**Math**

.20 * .65 * 25 = ?

*August 31, 2016*

**Pre-calculus**

see related questions below

*August 31, 2016*

**math**

why the decimals? We're practicing mixed numbers here 7 1/2 - 5 3/4 = 6 6/4 - 5 3/4 = 1 3/4

*August 31, 2016*

**math**

Take a look at the following article, and see what you can come up with: https://betterexplained.com/articles/navigate-a-grid-using-combinations-and-permutations/

*August 31, 2016*

**Geometry**

x^2+y^2+3x-8y+16=0 is the circle (x + 3/2)^2 + (y-4)^2 = 9/4 So, the center of the circle is at (-3/2,4) The distance to the line 4x+3y-12=0 is thus |4(-3/2) + 3(4) - 12|/√(4^2+3^2) = 6/5 So, the desired circle is (x + 3/2)^2 + (y-4)^2 = 36/25

*August 31, 2016*

**Geometry**

find the distance from the center of the circle to the line. Use that for the radius of the circle.

*August 31, 2016*

**maths**

9/12 = 75%

*August 31, 2016*

**maths**

Simon's distance: 6x Jade's distance: 11y 11*6 + 6x = 114

*August 31, 2016*

**algebra**

Start with the url below and fix your typos till you get one of your choices: http://www.wolframalpha.com/input/?i=solve+1%2F3x+%2B+3%2F4+y+-+2%2F3+z+%3D+-8,+x+%2B+1%2F2+y+-+1%2F3z+%3D+18,+1%2F6+x+-+1%2F8+y+-+z+%3D+-24

*August 31, 2016*

**math**

add the two equations and y drops out: 2x^2-22x = -48 x^2-11x+24 = 0 (x-3)(x-8) = 0 Now just find the y for each x.

*August 31, 2016*

**math**

If all you can do is multiply and divide, I don't see how it can be done. 5 and 7 are primes, and there is no way to cancel them as factors

*August 31, 2016*

**physic**

speed (m/s) = wavelength (m) * frequency (1/s) v = λf so, for a given frequency, the velocity is directly proportional to the wavelength. Get v in air, and then you can figure v in glass.

*August 31, 2016*

**physics**

T = kML

*August 31, 2016*

**math**

(a+b+c)^3 = a^3 + 3a^2b + 3a^2c + 3ab^2 + 6abc + 3ac^2 + b^3 + 3b^2c + 3bc^2 + c^3 so, (x^2+x+1)^3 expands as x^6 + 3x^5 + 3x^4 + 3x^4 + 6x^3 + 3x^2 + x^3 + 3x^2 + 3x + 1 which is what was above

*August 31, 2016*

**Algebra**

the first train is 40 miles ahead when the 2nd train starts. The 2nd train is going 10 mi/hr faster, so how long do you think it will take to cover the extra 40 miles?

*August 31, 2016*

**Math**

16/(26+19+21+26+32)

*August 31, 2016*

**Algebra**

google is your friend.

*August 31, 2016*

**Algebra 2**

all polynomials have a domain of all real numbers. Any straight line which is not a simple y = k horizontal line also has a range of all real numbers. To see this, just draw any line. It extends forever both left and right, and up and down. (unless ut is horizontal)

*August 31, 2016*

**Math**

71% of 519 is .71*519 = 368.49 (million) Not sure what you want to divide.\, nor what "work" you are referring to.

*August 30, 2016*

**math**

since BD bisects the angle, 5x+8 = 9x-14 x = 5.5 Now you can find ABC, which is ABD+BDC

*August 30, 2016*

**Math**

Since I have no idea of the diagram, it's hard to say. But I suspect you are dealing with angles on a transversal of parallel lines. Check into adjacent, alternate interior/exterior, etc.

*August 30, 2016*

**Geometry**

correct

*August 30, 2016*

**Algebra**

I get 3 x^1/4 (x^-3/2 + 2)

*August 30, 2016*

**Math**

In 3 years, an investment earns $108 simple interest at a rate of 3%. Find the principle. Thank You.

*August 30, 2016*

**Algebra**

Find the simple interest on an investment of $800 at a rate of 2.5% per year after 9 months.

*August 30, 2016*

**Math**

2050 * .02 = 41 care to change your answer?

*August 30, 2016*

**Math**

An investment of $2050 at a rate 2% interest earned in 164 in simple interest. Find the length of the time it was invested for My answer: 4 months

*August 30, 2016*

**Math**

remember your geometry, and theorems about angles formed by transversals of parallel lines, and their converses.

*August 30, 2016*

**Algebra**

3 g^-2 b^2 g^-2 = 1/g^2 so, the expressions is the same as 3b^2/g^2 1/g^-2 = 1/(1/g^2)) = g^2 Now we get into murky waters: (3/g^-2)h^3 = 3g^2h^3 -- not a choice 3/(g^-2h^3) = 3g^2/h^3 because that is the same as 3 * 1/g^-2 * 1/h^3 = 3g^2/h^3 don't be afraid to use ...

*August 30, 2016*

**Math**

clearly, 1,000,000 ------------ 10,000

*August 30, 2016*

**Math**

(3-2)*(10-5)*24

*August 30, 2016*

**Math**

3x + 2(3+x) - 1

*August 30, 2016*

**Math**

4/10 as many people means 10/4 as long to work. 5/2 * 6 = 15

*August 30, 2016*

**math homework**

5/n^5 (1^3 + 2^3 + ... + n^3)

*August 30, 2016*

**math homework help please?!!**

so, did you list the first 6 terms?

*August 30, 2016*

**math homework help please?!!**

substitute for y and you have x^2 + (16-x^2) = 128 Now just solve for x, and then get y.

*August 30, 2016*

**maths**

the area is |u×v| = |12i+14j+2k|

*August 30, 2016*

**math**

correct

*August 30, 2016*

**Math**

(1 + .085/365)^365 = 1.0887 or, 8.87%

*August 30, 2016*

**Math**

see related questions below

*August 30, 2016*

**Math**

correct

*August 30, 2016*

**Chemistry**

well, its density is 29.9/38.6 g/mL

*August 30, 2016*

**Math**

t seconds from the time of observation, the truck has gone 110km/hr * 1hr/3600s * 1000m/km * t s= 30.55t m cop car has accelerated at 44.44 m/s / 20s = 2.22 m/s^2 so its distance is 1.11 * 20^2 + (44.44(t-30)) so set them equal, and you find that the cop caught up after 64 ...

*August 30, 2016*

**Math**

Not quite. 1B ok 2D you lost the - sign 3C 4B ok 5C do not change the order of the numbers. That's Commutative. Plus you changed the 8 to -8.

*August 30, 2016*

**math homework help please?!!**

left limit: 13-1^2 = 12 right limit: 11-1 = 10 Looks like B to me Now, if it were 11+x, then the limit would be 1 from both sides. Note that f(1) is not defined

*August 30, 2016*

**math**

7x/8 = 21 7x = 168 x = 24 or, 7(x/8) = 21 x/8 = 3 x = 24 If you divided 21 by 8, you were just guessing.

*August 30, 2016*

**Chemistry**

A Helium Gas Ballon Has A Volume Of 12.0L. At Room Temperature(25 Degrees Celcius) The Internal Pressure Is .05ATM. Calculate The Number Of Moles Of Helium In The Balloon?

*August 30, 2016*

**math**

yeah, but why stop there? -8+2 = -6

*August 30, 2016*

**math**

3+2 = 5 3-2 = 1 so let's stick as close to that as we can: 3.0124 1.9876

*August 30, 2016*

**mAtH**

google is your friend - search for simultaneous equations examples and check out the images. Lots of problems. You don't say how many variables you want to use, and I assume they are linear.

*August 30, 2016*

**algebra**

no equation needed; just an expression: 3(n+2)-4

*August 30, 2016*

**algebra 1**

correct

*August 30, 2016*

**percentage**

.55 * .80 = .44 So, the other person got 56% of the total

*August 30, 2016*

**calculus**

u • v × w is just the determinant |5 9 -6| |5 8 -1| |-2 8 3|

*August 30, 2016*

**Math**

5/6 * 36 / 4

*August 30, 2016*

**That's for sure**

first cos(z) is never greater than 1. Second, z! is defined only for integers.

*August 30, 2016*

**Math**

well, 8012 = 4*2003 now just keep going

*August 29, 2016*

**Pre-Calculus**

distance = d rt = (3/4 r)(t+12) rt = 3/4 rt + 9r 1/4 rt = 9r t = 36 So, it takes 36+12=48 minutes to bike home

*August 29, 2016*

**algebra**

not quite. You want d to be between those values: 4.999 <= d <= 5.001

*August 29, 2016*

**algebra**

|d-5.000| <= 0.001

*August 29, 2016*

**Geometry**

how is 30.0 to the nearest 0.0001? Maybe you meant nearest 0.0001m, not mm?

*August 29, 2016*

**math**

when all you have is $100 bills, you gotta round to hundreds.

*August 29, 2016*

**Math**

I vote for 3^4^5 ≈ 10^488

*August 29, 2016*

**Math**

clear fractions, or cross-multiply 3(5x+6) = 7(3x-9) 15x+18 = 21x-63 ...

*August 29, 2016*

**algebra**

2x-4 = 22 2x = 26 x = 13 same way for the other

*August 29, 2016*

**Math**

P(q) = 1/3 P(n|d,q) = 2/9 P(n|d,n|d) = 4/9 So, what do you think? the 1st probability means that if the 1st coin is a quarter, the 2nd does not matter.

*August 29, 2016*

**geometry**

tb = tu+ub -3 = 1-x + 4x+17 Now just find x, and then tu. not sure how you get negative lengths.

*August 29, 2016*

**algebra**

m = g+150 2(m-190) = g Now just solve for m.

*August 29, 2016*