Friday

September 30, 2016
Total # Posts: 44,251

**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*

**Math**

just plug in x = -2 y(-2) = 2(-2)^2 + 8(-2) + 5 = 2*4 - 16 + 5 = 8-16+5 = -3 If y is a function of x, y(2) means evaluate y at x = -2, not multiply y by -2. Looks like you have some serious reviewing to do.

*August 29, 2016*

**Math**

recall that the vertex is at x = -b/2a In this case, that is at x = -8/4 = -2. y(-2) = -3 So, the vertex is at (-2,-3) You can also determine this by completing the square: y = 2x^2 + 8x + 5 = 2(x^2 + 4x + 4) - 3 = 2(x+2)^2 - 3 New recall that the vertex of y = a(x-h)^2 + k is...

*August 29, 2016*

**PHYSICS**

see related questions below

*August 29, 2016*

**Math**

solve as if they were equations. The lines intersect at (-1/3, 4/3) The solution is the area to the right of x = -1/3, below the blue line and above the red line. see http://www.wolframalpha.com/input/?i=plot+y+%3D+2x%2B2,+y+%3D+-x%2B1

*August 29, 2016*

**Math**

Since all the numbers on the left are even, I can't see how to get an odd result.

*August 29, 2016*

**Algebra2**

If you want to reflect the whole graph across the x-axis, that would be -(x^2+5) = -x^2-5 Make a visit to wolframalpha.com and type in your functions. It will show the graph. Make a change a refresh, and you can see the new graph. You can do more than one at a time by ...

*August 29, 2016*

**Algebra2**

Let g(x) be the reflection of f(x)=x^2+5 What is the function rule for g(x)? I know the first part would be-x^2 but not sure if the 2nd part is a plus or minus.

*August 29, 2016*

**Algebra2**

thank you

*August 29, 2016*

**Algebra2**

Write an equation for the following transformation of y=x: a vertical stretch by a factor of 6. A. y=6x B.y=x/6 C.y=x+6 D.y=x-6 my answer is a

*August 29, 2016*

**Algebra2**

yes, because the +y axis is up

*August 29, 2016*

**Algebra2**

Thank you so the +5 number would always be up and a -5 number would always be down?

*August 29, 2016*

**Algebra2**

stretch vertically by 5: -35x^2 shift up 5: -35x^2 + 5

*August 29, 2016*

**Algebra2**

What transformations change the graph of (f)x to the graph of g(x)? f(x) = -7x² ; g(x) = -35x²+5

*August 29, 2016*

**Math**

If you mean effort then you are right. Maybe some of that effort should go into spelling, typing, or proofreading...

*August 29, 2016*

**math**

75% is 3/4 so, 1/4 failed so, what is 1/4 of 36?

*August 29, 2016*

**phisics**

After t hours, the total distance is covered, so 7.8t+7.6t = 6.0+4.2 t = 0.662 hr So, A's final position after that long is -6 + 7.8 * 0.662 = -0.836 km or, 836 meters west of the pole.

*August 29, 2016*

**math**

the perimeter is half a circle plus the diameter, so 3π+6 assuming the shaded shape is the semicircle. If not, I'm sure you can work it out.

*August 29, 2016*

**physics**

density = mass/volume, so (6×10^3 kg) / (4π/3 * (6.4×10^3 km)^3) If you do the division, you will see an unexpectedly small result You sure the mass of the earth is only 6 metric tons?

*August 29, 2016*

**Maths**

well, you know that 2x(3x-4) = 6x^2-8x (x-1)(x+3) = x^2+2x-3 now just subtract

*August 29, 2016*

**Math**

correct

*August 29, 2016*

**Math**

If I gave you $2 each hour, how long would it take for you to have $8? Same problem, but using positive numbers.

*August 29, 2016*

**Math**

differences: 10,10,10,10 looks like an AP to me.

*August 29, 2016*

**physics**

not sure what "four folded" means. If you mean the cross-section area is multiplied by 4, then the resistance is divided by 4. If the diameter is multiplied by 4, then the resistance is divided by 16 If the length is multiplied by 4, then also the resistance.

*August 29, 2016*

**mathematics**

AP/AB = 2/3 (AP+2)/AB = 3/4 (AP+2)/AP = 9/8 1 + 2/AP = 9/8 2/AP = 1/8 AP = 16 16/AB = 2/3 18/AB = 3/4 AB = 24

*August 29, 2016*

**Math**

If the two numbers are x and y, then y = 3x-1 2x+y = y+18 Now just solve for x and y

*August 29, 2016*

**math**

assuming you meant "tens digit" then you might have 123 124 ... 689 789

*August 29, 2016*

**math**

2/3 + (1/2)(1/3) = 5/6 So, 1/6 of the original number is 6

*August 29, 2016*

**radical equation please help!!!**

If you're trying to solve the equation, √(1+x) - √(1-x) = √(1-x-√(1+x)) (√(1+x) - √(1-x)) = √(1-x-√(1+x))^2 (1+x) - 2√(1-x^2) + (1-x) = 1-x-√(1+x) 2 - 2√(1-x^2) = 1-x-√(1+x) 1+x = 2√(1-x^2)-&#...

*August 29, 2016*

**math help please?!**

minors and cofactors are simple; just follow the rules. I'll do the ones for [1;1] minor: remove row 1 and column 1: [-2 6] [3 -6] cofactor: add the index of the row and column, and use that as an exponent of -1, then multiply the minor by that: (-1)^(1+1) = (-1)^2 = 1 so...

*August 29, 2016*

**Math**

oops. du = -5cos^4x sinx dx things are a bit more complicated than I showed here, since you wind up with a sin^2(x), which has to be converted into (1-cos^2 x) and you go around again.

*August 29, 2016*

**Math**

∫(cos^3 x)^2 dx = ∫cos^6 x dx Now, just as cos(6x) can be expanded into a polynomial in cos(x), cos^6(x) can be expanded into a sum of cosines of multiple angles: = ∫(1/32)(15cos(2x)+8cos(4x)+cos(6x)+10) dx = 1/32 (15/2 sin(2x) + 2sin(4x) + 1/6 ...

*August 29, 2016*

**Math**

Let x,y,z be the amounts of the three, in the order named. Then x+y+z = 24 x+z = 2y y+z = x Now solve for x. Hint: it is not 21

*August 29, 2016*

**Physics**

a = 50kph/8s = 25/4 km/hr/s = 1.736 m/s^2 Vo = 40 km/hr = 11.11 m/s, so s = Vo*t + a/2 t^2 now just plug in the values for Vo,a,t

*August 29, 2016*

**applied maths**

Draw a diagram of the box with the sides unfolded and lying flat. Now draw a straight line from spider to fly, and the distance x is x^2 = (1/2)^2 + (3/2)^2

*August 29, 2016*

**Calculus**

see related questions below

*August 29, 2016*

**math**

each ate 3/8 so, 5/8 remained

*August 29, 2016*

**math**

Many choices: 3/5 4/6 5/7 ... didn't you even try at all?

*August 29, 2016*

**science**

Its name?

*August 28, 2016*

**Math**

If Matt takes m hours, then Carla takes 4m. So, together, 1/m + 1/4m = 1/8 5/4m = 1/8 m = 10

*August 28, 2016*

**Math science**

end of what? zero is just a number, like any other. Though it does have several unique properties. There is no "end" number.

*August 28, 2016*

**Urgent Math**

I like it! But the half-angle formula would have gone directly to (cos2x - 1)/sin2x = -tanx Then we'd have ∫tan^2(x) dx = ∫sec^2(x)-1 dx = tanx - x + C

*August 28, 2016*

**Urgent Math**

∫(cot2x-csc2x)^2 dx ∫ cot^2(2x) - 2cot(2x)csc(2x) + csc^2(2x) dx ∫ 2csc^2(2x) - 1 - 2cos(2x)/sin^2(2x) dx Now everything is standard forms, so you get -cot(2x) - x + 1/sin(2x) csc(2x) - cot(2x) - x or, you can go on to get (1-cos(2x))/sin(2x) - x (1 - 2cos^2(...

*August 28, 2016*

**physics**

the height is modeled by the function h(t) = 60 + 30t - 4.9t^2 max height is at the vertex of the parabola, at t = -b/2a = 30/9.8 Use that to evaluate h(t) there. It hits the ground when the height has dropped to zero. So, just solve 60 + 30t - 4.9t^2 = 0

*August 28, 2016*

**physics**

while I did miss on the velocity/speed problem, I think we can assume that if he is driving east, as given, that is the direction of the straight road... But, it's fun to be picky when the problem is poorly stated.

*August 28, 2016*

**physics**

assuming (1) that you meant 48.0 km/hr (2) that speed was achieved during the 144km trip then since time = distance/speed, it would take 144/48 = 3 hours

*August 28, 2016*

**Math**

Just substitute in a desired value. f(x) = 3x+2 f(a) = 3a+2 f(2a) = 3(2a)+2 = 6a+2 f(4) = 3(4)+2 = 14 and so on

*August 28, 2016*

**Math**

A = x(3-2x) = 3x-2x^2 P is ok your conclusion is correct, except that 3-2x = -1 when x is 2.

*August 28, 2016*

**Math**

solve what? The only thing we can say is that the bearing of q from p is 180+55 = 235°

*August 28, 2016*