Friday
September 30, 2016

Posts by steve

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

Math
42
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

math
6!
August 28, 2016

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