Sunday
September 25, 2016

Posts by steve

Total # Posts: 44,050

math
well, there are 4 sides, so ...
September 9, 2016

Math
since the other wall is also 20 ft, and area = length * width, it is 20ft * 20ft = 400 ft^2
September 9, 2016

Algebra
2^-1 + 4^-5 = 1/2^1 + 1/4^5 = 1/2 + 1/1024 = 513/1024 You can always type in your expressions at wolframalpha.com to verify your answers
September 9, 2016

Math
read the question again carefully. Only boys or girls in each row. Why did you combine them into rows of 18?
September 9, 2016

Math
consider that 9 divides both 72 and 90
September 9, 2016

Physics
F = ma, so together, (6.0+4.0) = 3.2a opposite, (6.0-4.0) = 3.2a
September 9, 2016

Physics
F = ma, so 0.40a = 25
September 9, 2016

Grammar world
subject, verb, dir obj, obj complement they | crowned | him / king
September 9, 2016

Algebra
Hmm. Watch those minus signs. (x^-2)^3 (x^2)^4 = x^-6 * x^8 = x^2 x^2/x^15 = 1/x^13 = x^-13
September 9, 2016

Math
15 m/s * 1km/1000m * 3600s/hr = 15*3600/1000 km/hr 750m * 1s/15m = 750/15 s
September 9, 2016

math
The difference in meaning is that -3 is a signed value. It lies to the left of zero +3 is also a signed value, and since it is positive, it lies to the right of zero |-3| is just the physical distance (left or right) of -3 from zero. Since we live in a physical world, all ...
September 9, 2016

Math Help needed quickly
Think on it. If there were 55 ml alcohol, there would be 45 ml water. That's 10 ml less. We have 20 ml less, so there must be 110 ml alcohol 90 ml water
September 9, 2016

Math - hmmm
I'm not familiar with this notation. Have you some other information, maybe a subject topic in your text?
September 9, 2016

Math
just add up the amount of work done by A and B in a minute. Together, they do 1/20 of the job: 1/36 + 1/x = 1/20
September 9, 2016

Math
I think that's draughts, not droughts! Just my dry wit...
September 9, 2016

Calculus
so it does. It's just Algebra I to figure it out. What do you get?
September 9, 2016

calculo
f = 4x^(5/4) + 10x^(3/2) f' = 4(5/4)x^(1/4) + 10(3/2)x^(1/2) = 5∜x + 15√x f'(4) = 5∜4 + 15√4 = 5√2 + 30
September 9, 2016

Math
4Q-8 = 3 4Q = 11 Q = 11/4
September 9, 2016

mates
20+65 = 85 + 76 = 161
September 9, 2016

Math
Using 15% of 27.60 is wrong, because the 27.60 already includes the tip. Instead, you should use 3p * 1.15 = 27.60
September 9, 2016

Math
you know that the whole circumference is 2πr. You have only a fraction of that; namely, 110/360 * 2πr
September 9, 2016

Calculus
dT/dt = -.0065 dh/dt so plug in you number for dh/dt
September 9, 2016

Algebra 2
must be right then.
September 9, 2016

ALGEBRA 2
no problem. Guess all you had to do was think about it a bit.
September 9, 2016

Math
(1/2)/2 + 1
September 9, 2016

math
That is correct. They have to satisfy the Cauchy-Riemann equations.
September 9, 2016

Math.
you're kidding, right? with google and online dictionaries at your fingertips, you post such a question?
September 9, 2016

anal.gom.
oops. I botched it a bit, and lost the 3. We pick it up here: (x+8)^2 + 3(y - 50/3)^2 = 2680/3 now get rid of that pesky 3: (x+8)^2/3 + (y-50/3)^2 = 2680/9
September 9, 2016

anal. geom.
try completing the squares: x^2+16x + 3y^2-100y = -4 x^2+16x+64 + 3(y^2 - 100/3y + (50/3)^2) = -4 + 64 + 3*(50/3)^2 (x+8)^2 + (y - 50/3)^2 = 2680/3 unusual, but hey, it's just numbers, right? But still, it's so odd that I suspect a typo. You sure it's not 4y^2? If ...
September 9, 2016

help please?!
well, it went down 1/2 M in 1/2 minute.
September 9, 2016

Chemistry
I think you need to recall that 1 mole of any gas occupies 22.4L at STP.
September 9, 2016

maths
why don't you make a nice table out of all this stuff and work up some Venn diagrams and maybe show some work and let us know just what the trouble is instead of just tossing a bunch of numbers and stuff into the vat and stirring it up into one long and confusing run-n-and...
September 9, 2016

English
#2 is more commonly sung, as it reflects the folksy hillbilly type of feel of the song. I have never heard #1 used. Ever. As for the meaning, #1 Nope. #2 maybe, in the sense that the singer is on a trip, coming from Alabama. #3 an ungrammatical rendering of "I have come&...
September 9, 2016

Math.
rd 45: 45 3*15 wraps: 15 more 3*5 wraps: 5 more 3*1 + 2 wraps: 1 more 1+2 wraps: 1 more
September 9, 2016

Maths
j = d-3 d+4 = (3/2)(j+4) plug in j and solve for d.
September 9, 2016

Math
well, x(x+7) is a multiple of 60. 5*12 = 60 guess that works, eh?
September 9, 2016

Physics
the speed drops from v to zero when the ball reaches max height. since the speed is v - 9.8t that is zero when t=3, so v - 9.8*3 = 0 ... then, you know that the height is vt - 4.9t^2 Now you know v, and t=3, so plug and chug.
September 9, 2016

MATH TRIGONOMETRY
Tell you what. I'll do the graph, and you answer the questions. http://www.wolframalpha.com/input/?i=-x(x-1)(x%2B2)
September 8, 2016

Algebra 2
if a lbs are type a, then the rest (600-a) are type b. So, add up the parts and make sure it matches the whole: 75a + 52(600-a) = 60*600
September 8, 2016

Physics
a = 42m/s / 2s = 21m/s^2 s = 1/2 at^2
September 8, 2016

Math
5(14+10) = ?
September 8, 2016

Math
Not D, because f(3) has two different values. So, f is not a function.
September 8, 2016

Math
next steps: 8(7-27)/8 + 245 8(-20)/8 + 245 ...
September 8, 2016

Math
as long as each x value appears only once, it is probably a function. So, I'd pick A and B on that basis. D also works. While 0 appears twice as the first element, the 2nd element is the same. So, the pair (0,3) appears twice, but it does not violate the rules for functions.
September 8, 2016

Math
8 + 6/2 = 11
September 8, 2016

math
v = at so, how long does it take to fall 685 ft?
September 8, 2016

Math
not sure what each watermelon with 12.73 inches and 2.7 inches in height means
September 8, 2016

Algebra
3*84 <= 81+87+x <= 3*89 254 <= 168+x <= 267 ...
September 8, 2016

Algebra
since distance = speed * time, 20x = (20-4)x + 6 and I think you meant "downwind"
September 8, 2016

Math
correct. If you type in your expressions at wolframalpha.com you can check your answers quickly. For example, http://www.wolframalpha.com/input/?i=2+1%2F7+divided+by+3+2%2F3
September 8, 2016

math
That's h of x, not h times x. h(x) = √(4-x^2)/(x-3) or h(x) = √((4-x^2)/(x-3)) In either case, x=3 is excluded because the denominator is zero. Now, √z has a domain of z>=0. In the first case, 4-x^2 >= 0, so x^2 <= 4 |x| <= 2 In the second ...
September 8, 2016

Maths
roughly 0.6 * 150
September 8, 2016

Algebra 2
15000/3500 = ? round up to next whole bucket
September 8, 2016

Technology
correct
September 8, 2016

Math
just write down the parts and add them up
September 8, 2016

Algebra
well, 7^2 = 49 8^2 = 64 So, it's either 7 or 8, but now you gotta figure which one.
September 8, 2016

Math
oh, well, 1 3/7 = 1+3/7 = 7/7 + 3/7 = 10/7
September 8, 2016

Math
well, the idea is right, but 3/7 = 15/35 Then, do just what you did with the previous problem: 15/35 - 38/35 = -23/35 Plus, you misspelled "to"
September 8, 2016

math
yes.
September 8, 2016

math
huh? This is exactly like the last one; just use different numbers. What do you get?
September 8, 2016

math
c = t+60 t = 2/3 c or, t = 2/3 (t+60)
September 8, 2016

Math
hey, it's nice to see a problem posted that shows some thought and effort.
September 8, 2016

Math
yep
September 8, 2016

Math
for sphere, v = 4π/3 r^3 for cylinder, v = πr^2h so, since the radius of the cylinder is 1, 4π/3 (1^3+2^3) = πh
September 8, 2016

Math
draw a diagram. The diagonal of the square is the diameter of the circle. Knowing that, you can figure the area of the square.
September 8, 2016

science
#1 Really, lattices are found in crystals. (Plus, why would that be affected by a charged balloon?) #2 C looks good to me.
September 8, 2016

Math
google is your friend. just search for equilateral triangle. If the side is s, then perimeter = 3s area = √3/4 s^2
September 8, 2016

Mathematics
(3 5/7)x = 3 1/4 (26/7)x = 13/4 x = 13/4 * 7/26 = 13/26 * 7/4 = 1/2 * 7/4 = 7/8
September 8, 2016

Math
total points for 4 tests @ 96 = 384 points so far: 94+98+98 so, how many does he need on the last exam? Hint: 96 is the average of 94 and 98
September 8, 2016

Science
a magnet will get the iron oil floats on water evaporate the water to get salt
September 8, 2016

physics
The larger car is the Mercedes-Benz.
September 8, 2016

Maths
Drop altitudes from C and D. That will create a rectangle and two right triangles. I'm sure you can find those areas. Don't forget the Pythagorean Theorem to find the altitude.
September 8, 2016

Algebra2
Draw the lines y = 4x-1 y = 3x-1 Shade everything below the 1st, and above the 2nd. The intersection of the two shaded areas is the solution set
September 8, 2016

Algebra2
Solve the inequalities by graphing y<=4x-1 y>3x-1
September 8, 2016

Math
2/3 X 21 2 x 7 14
September 8, 2016

AAHHOOOOGAH! Homework Dump!
how about showing some of your ideas on any one of the problems?
September 8, 2016

Math
how can a rectangle have three such ratios? If 3:4, then the width is 3x and the length is 4x, and we have 2(3x+4x) = 70
September 8, 2016

Calculus
Riemann sums, trapezoidal method. google numerical integration or quadrature
September 8, 2016

Calculus
I don't see any way, other than numerical approximations. The velocity is not a nice linear function, so only an integral can give an exact answer ∫[0,14] (11+6cosx) dx
September 8, 2016

MATHS
dC/dx = 600 - 180000/x^2 plug in x=100 I assume C(x) is the income function
September 8, 2016

math
ummm, 33*41 ?
September 7, 2016

Math
You have the right idea re add 6.75 + 3.5 = 10.25 not 10.35 you have the right process to get per hr $92.25/10.25 =$9 per hr
September 7, 2016

Pre algebra
a rational number is what you know as a fraction. It is the ratio of two whole numbers. 3/4, -7/11, etc. An integer is a rational number with a denominator of 1. Or, more commonly just what you think of as a counting number, but may be negative: 3/1 = 3 -2/1 = -2 and so on An ...
September 7, 2016

math
(1/20000)^2 * 50 km^2
September 7, 2016

Math
You have 8 3.4 gal of paint you're going to use 2/5 of it to paint what type of math would you use to figure how much? Multiplication!! 8 3/4 times 2/5 = see if you can get it from there
September 7, 2016

MATH...please help
If $x is at 5%, then the rest (10000-x) is at 6%. The interest of both parts must add up to 575: .05x + .06(1000-x) = 575
September 7, 2016

Algebra HELP!
when it says substitution, use the value from one equation to solve the other. y = 2x-1, so the 2nd equation becomes 2x+2(2x-1) = 22 2x + 4x - 2 = 22 6x = 24 x = 4 Using elimination, find ways to make one variable disappear by adding the two equations (or multiples of them) 5x...
September 7, 2016

Advance Math
well, 45° is 1/8 of a circle. So, the volume is 1/8 of the whole.
September 7, 2016

Math
If the fraction is x/(x+1), then we are told (x+1)/x = 3/4 + 7/12
September 7, 2016

Algebra ll
well, what is the minimum number of tellers?
September 7, 2016

Calculus integrals
there are nice online Riemann sum calculators so you can check your work >wink wink<
September 7, 2016

Math
hundreds
September 7, 2016

math
seven times a number: 7x difference between 18 and 7x: 18-7x Think you can take it from there?
September 7, 2016

Calculus
I'm sure you can make the table. You know that sinu/u -> 1 as u ->0 since cos(0) = 1, that means that tanu/u -> 1 as u -> 0 You have tan3x/7x = tan3x / (3x)*(7/3) = (tan3x/3x) * 3/7 so, what do you think the limit is?
September 7, 2016

Math
assuming that "t" means "+", 4a+a+a = 4a + 1a + 1a = (4+1+1)a = 6a the a's add up just as 4 oranges + 1 orange + 1 orange = 6 oranges 4+1+1 of anything make 6 of that thing. In this case, "a"
September 7, 2016

Math - vectors
LCM(4,14) = 28 So, 7r = 28i + 7tj 2s = 28i - 24j so, if 7t = -24, 2s = 7r, so one is a multiple of the other. Or, more directly, 14/4 r = 14i + 14/4 t j so, if 14/4 t = -12, s is a multiple of r.
September 7, 2016

Science
you know that gravity provides constant acceleration. That means the the velocity grows by the same amount in equal time periods. That is why g = 9.8 m/s^2 That means g = (9.8m/s)/s Or, v grows by 9.8 m/s every second. So, if v=9.8t after t seconds, then you want t where 9.8t...
September 7, 2016

Math
naturally, (2x+7)^3 just expand that out.
September 7, 2016

Math III Honors
note that at each break point, the base amount is the maximum tax of the previous bracket. That means that for income <= 6000 max tax is 600 <= 27950 max tax is 3892 <= 67700 max tax is 3892.50 So, tax of 4446 means that income was between 27950 and 67700 3892 + .27(x...
September 7, 2016

Math
pairs where y=0 are on the x-axis pairs with x=0 lie on the y-axis
September 7, 2016

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