Saturday
January 21, 2017

Posts by steve

Total # Posts: 47,947

Algebra
X=A + B= 168618472 if b = 17472947 than what is A +Z = X what is x
December 19, 2016

Math
if you want the square root, then that would be 4/7
December 19, 2016

HELP ME PLZ MATH
21/28 = 7*3 / 7*4 = ?
December 19, 2016

MATH
(152-133)/10
December 19, 2016

Algebra 1a
the slope is 7/10 Now just use the point-slope form of the line.
December 19, 2016

Trigonometry
tan(?-30) = -5 tan 78.7 = 5 since tan? is negative in QII and QIV, ?-30 = (180-78.7) or (360-78.7) so, now you can figure ?
December 19, 2016

Financial mathematics
P(1+r)^20 = P(1+r)^10 * (1+r)^10 So, the amount after 10 years is 800000/(1+.053/12)^(12*10) = 471433.81
December 19, 2016

maths
the base has area (40-26)/2 = 7 divide by 2 since the faces come in pairs.
December 19, 2016

chemistry
first step: what is your balanced equation? then start using moles.
December 19, 2016

Algebra
#10 wrong -- see #11 #11 right #14 has a typo, but I'm pretty sure you're wrong. #24 what does a tiny correlation coefficient mean? #25 use your favorite best-fit line tool. Many online.
December 19, 2016

Math
better try using (16,0) and (0,-4)
December 19, 2016

connections math
x/5 = -2 x = -2*5 x = -10 Ernesto lost 14.5 pounds ... x - 14.5 = 156.5 assuming that he weighed 156.5 after the weight loss The ones you answered you got correct.
December 19, 2016

math(geometric series)
512/729 = 2^9/3^6 = 2^8/3^8 * 2*3^2
December 19, 2016

tangent help me maths
you want to find where 2x+5y+11=0 intersects x²+y²+2x-8y-12=0 just doing a straight substitution, we get 4x^2+4y^2+8x-32y-48 = 0 2x = -(5y+11) so, (2x)^2+4y^2+4(2x)-32y-48 = 0 (5y+11)^2 + 4y^2 - 4(5y+11) - 32y - 48 = 0 29y^2+58y+29 = 0 29(y+1)^2 = 0 y = -1 Since ...
December 19, 2016

Algebra
two exterior angles are also 90° The remaining exterior angles (all the same), are 180-120 = 60° The exterior angles add to 360°, so there are 3 more of them, each 60°. The figure is a pentagon similar to a home plate in baseball. Consider that the interior ...
December 19, 2016

Math
just mark off any distance x on QR and measure it off 10 times. Let the last point marked be R. Draw line PR. Then construct parallel lines at each marked point on QR, and their intersections with PQ will divide it into 10 equal segments.
December 19, 2016

Math
I think you can show with little effort that CDEF is a parallelogram. Then find angle ?=DEF of CDEF and its area is 5*5*sin?
December 19, 2016

Math
1/8
December 19, 2016

math
their sum is ?/2, so if the smaller angle is x, then x + x+2?/5 = ?/2
December 19, 2016

math
draw an altitude. It forms a 30-60-90 right triangle, where the sides are in the ratio 1:?3:2
December 19, 2016

math
back it up an hour, and it the same motion as moving from 12:00 to 3:00. Is that easier?
December 18, 2016

geography
since there are 24 hours in a day (360°), each hour covers about 15°.
December 18, 2016

Geometry
exterior + interior = 180 The interior angle could be either the vertex angle or one of the two base angles
December 18, 2016

maths
huh? really? They gave you the numbers! 96:50.40 I guess you could simplify that a bit to 9600/5040 = 40/21
December 18, 2016

Calculus
depends on the man's height, h. If the shadow's height is s and the light is x m from the wall, then using similar triangles, we have x/s = (x-4)/h x/(x-4) = s/h -4/(x-4)^2 dx/dt = 1/h ds/dt So, plugging your numbers, -4/36 * -1/2 = 1/h ds/dt ds/dt = h/18
December 18, 2016

physics
draw the diagram. You have a nice 30-60-90 right triangle with a diagonal of 100, so calculating the sides is easy. right?
December 18, 2016

math
If m=1, you have (x+1)/(x-1) = 1 x+1 = x-1 1 = -1 So, there is no solution, as you already noted. This is made clear when you solve for x: (x+m)/(x?1)=1 x+m = x-1 m = -1 That is the only value of m which works.
December 18, 2016

Math
the lines intersect at (2,-7). Now just use the 2-point form of the line.
December 18, 2016

unitar
sounds feasible, all right.
December 18, 2016

Math
that's what happens when you guess instead of calculate. You are decreasing a larger number, so the % is less: 1.25 * r = 1 r = 1/1.25 = 0.80 = 80% So, you just have to give a 20% discount to get back to the original price.
December 18, 2016

Math
if y=cost and x=units, then y = 4000 + (30-22)/(6-4) x
December 18, 2016

Math
y = 1200 + (1350-1200)/2 x Now just plug in x=3 (3 years since 1985)
December 18, 2016

physical science
PV=kT if T is constant, PV is constant. So, you want 208V = 106*3
December 18, 2016

Math
The same way I already showed you ...
December 18, 2016

Mensuration
Just subtract the bare floor from the total area: 10*8 - (10-2*2)(8-2*2)
December 18, 2016

Algebra II Honors
(25+x)(10+x) = 1000 Or, you could just double the dimensions. Then the area grows by a factor of 4, to 1000 ft^2.
December 18, 2016

Math
sure. at t=0, we are at the maximum value. But sin(0) = 0 and sin(t) is a maximum 1/4 period later. Go to the website and play around with different shift values. If you replace 3 with 0, you will see that the graph starts at y=10, but we want to shift it so that it starts at ...
December 18, 2016

Math
I suspect they are expecting you to say the cosine model is simpler, since then there is no shift needed: we start at the max or min. Then all you need is y = ±4cos(?/6 x) + 10
December 18, 2016

Math
high tide = 14m low tide = 6m so, the center line is (14+6)/2 = 10m, and the amplitude is (14-6)/2 = 4m The 1/2 period (max to min) is 6 hours, so the period is 12 hours. SO, we can start with y = 4sin(?/6 x) + 10 However, sin(x)=0 at x=0 (high tide), and we want y to be at ...
December 18, 2016

Math
next steps: 2x^2+x-21 = 0 (2x+7)(x-3) = 0 x = -7/2 or 3 since real-world figures do not have negative dimensions, the rectangle is thus 3x7. Which you probably already guessed, since the only factors of 21 are 3 and 7!
December 18, 2016

calculus
it sure is (x-x^3)-(x^2-x) = -x^3-x^2+2x You can't combine x^2 and x^3 to make x^5!! They're added, not multiplied.
December 17, 2016

calculus
since f > g on (0,1), the area is just ?[0,1] (x-x^3)-(x^2-x) dx = 5/12
December 17, 2016

math
Since the diameter is symmetric about (0,0), B=(-3,5)
December 17, 2016

math
note that y grows by 19 when x grows by 1. So, start with y = 19x Now adjust that so it fits the table.
December 17, 2016

Calculus Finals Review sheet!! Explanation needed
inflection points are where y"=0. That is, where y' has a max or min. [[x-2]]/x -> [[3.5-2]]/3.5 = 1/3.5 upward acceleration is where the velocity is increasing. That is, where the graph is concave up.
December 17, 2016

algebra
try typing your expressions in at wolframalpha.com
December 17, 2016

algebra
without the typo, we have (3x-2)(2x-3) = 3x(2x-3) - 2(2x-3) = 6x^2-9x - (4x-6) = 6x^2-9x - 4x+6 <------- = 6x^2-13x+6
December 17, 2016

Dilation
just multiply all the coordinates by 2.
December 17, 2016

Go with @Joe
Sorry about my typo. e^.07t is correct
December 17, 2016

Math
e^(1.07t) = 2
December 17, 2016

precalculus
the odd powers of (-y)^k have a minus sign.
December 17, 2016

precalculus
 1 1 1 Now form new rows by adding 1 at each end and each element is the sum, of the two above it. google is your friend. It will provide many discussions of this topic.
December 17, 2016

a.p.
or, we know that Sn = n/2 (2a + (n-1)d) = 3n^2+2n an + n(n-1)/2 d = 3n^2+2n an + d/2 n^2 - d/2 n = 3n^2+2n d/2 n^2 + (a - d/2)n = 3n^2+2n d/2 = 3 so d=6 (a-3)=2 so a=5 Tn = 5 + 6(n-1) = 6n-1
December 17, 2016

algebra
-3(4y-9)+2(2y+6) = (-3)(4y) + (-3)(-9) + (2)(2t) + (2)(6) = ...
December 17, 2016

Math - Coordinate Geometry
huh? You can't apply the distance formula? AB = ?((5+2)^2+(4-3)^2) = ?(49+1) = ?50 CD = ?((-3-4)^2+(-4+3)^2) = ?(49+1) = ?50 So, AB=CD Now do the same steps for AD and BC.
December 17, 2016

maths
the fixed setup cost must be 75-45=30 so, 1000 copies cost 30 + 10*15
December 17, 2016

maths
100 per 10,000 so, use that to find for another 23,000 people: 675+230=905
December 17, 2016

Math
path is total area minus the pool: (8+1)(5+1) - 8*5 = ?
December 17, 2016

Math
the dimensions are 8x and 5x. So, 8x * 5x = 169 40x^2 = 169 x^2 = 169/40 x = 13/?40 Now you can determine 8x and 5x
December 16, 2016

Cardinality of Intersection
15+60-x = 63
December 16, 2016

math
This should help out: http://www.jiskha.com/display.cgi?id=1317372273
December 16, 2016

math
well, 8 = 2^3 a^27 = (a^9)^3 ...
December 16, 2016

precalculus
#1 ok #2 will be the x^4 term #3 will be the x^10 y^2 term #4 Nope. It is 8C6 (3x)^2 (-2y)^6 = 28*3^2*2^6 x^2y^6 = 16128 x^2y^6
December 16, 2016

precalculus
correct
December 16, 2016

Algebra
A+69-13 = 107
December 16, 2016

math
It is (somewhat) clearly a motion problem. v(t) = t^2-2t+1 s(t) = 1/3 t^3 - t^2 + t + C Now, knowing that v(1) = 4 does not help to find C. Moreover, given the equation, it is clear that v(1)=0, not 4. So, let's assume that s(1) = 4. Then we have 1/3 - 1 + 1 + C = 4 C = 3 ...
December 16, 2016

Algebra
x^2 + 10x = 18 x^2 + 10x + 25 = 18+25 (x+5)^2 = 43 x+5 = ±?43 x = -5±?43 work the other in like wise.
December 16, 2016

math
x(t) = 9t^2/2 - t^3/2 v(t) = 9t - 3t^2/2 a(t) = -3t Now it should be easy to answer the questions.
December 16, 2016

algebra
300+5x = 700-6x love the duplication. :-(
December 16, 2016

algebra
t^0 = 1 negative exponents cause switch between top and bottom (4t)^2t^0/t^6v-8 = 16t^2 * v^8/t^6 = 16v^8/t^4 or 16 t^-4 v^8 p^-3/p^-2r^3 = 1/p^3 / (r^3/p^2) = p^2/(p^3r^3) = 1/(pr^3) or p^-1 r^-3
December 16, 2016

geometry
the one that's about 78.5/3.14
December 16, 2016

Math (please help!!)
the last one the clue is that a right angle is perpendicular hence, it belongs with perpendicular bisectors
December 16, 2016

Algebra 2
3.stretch: 3x^3 right: 3(x-4)^3 down: 3(x-4)^3 - 3
December 16, 2016

math
x^2 + 15^2 = 19^2
December 16, 2016

math
surely you can at least do part 1. ?
December 16, 2016

Algebra
x >= 2 1.75 + 0.55x <= 10.00
December 16, 2016

harmonic progression
again with this stuff? n ?k(k+1)(2k+1) k=1 = ?(2k^3+3k^2+k) = 2?k^2 + 3?k^2 + ?k Now just consult your reference for special sums of powers to get a 4th-degree polynomial for n.
December 16, 2016

Math - Coordinate Geometry
The slope of 2x-3y+3=0 is 2/3. The parallel line you want has a slope of 2/3 and passes through (6,-4) So, using the point-slope form of the line, y+4 = 2/3 (x-6)
December 16, 2016

calculus
y = arctan(x) tan(y) = x sec^2(y) y' = 1 y' = 1/sec^2(y) = 1/(1+tan^2(y)) = 1/(1+x^2)
December 16, 2016

algebra
(-x)^2 (-x)^5 = (-x)^7 = -x^7 (-3m^3)^2 = (-3)^2 (m^3)^2 = 9m^6 (x/y)^-3 = (y/x)^3 = y^3/x^3 or, (x/y)^-3 = x^-3 / y^-3 = x^-3 y^3
December 15, 2016

Algebra
x @ 2pts y @ 1pt x+y = 50 2x+1y = 87
December 15, 2016

Algebra
3x-500 = 840
December 15, 2016

Pre geometry
check your theorems on transversals of parallel lines. alternate/corresponding interior/exterior angles are equal adjacent angles are supplementary I suspect your answer is 132 degrees, but I have no diagram to consult.
December 15, 2016

uchs
so, I guess the width is 6+7t
December 15, 2016

Math
(5u)+(5u - 8/3) -----------------       2 though I'm not sure how 8/3 fewer is possible.
December 15, 2016

MATH 2
147 is 1.4 std above the mean, so ...
December 15, 2016

Math
a+c = 163 11a+6c = 1578
December 15, 2016

ST KYLINS
My digits in the ones period are zeros. xxx,xxx,000 now what else do you know?
December 15, 2016

calculus
this should help http://www.jiskha.com/display.cgi?id=1481848543
December 15, 2016

Maths
I agree. Since the distance between the foci is only 2, there is no way that the condition can be met.
December 15, 2016

Maths
google is your friend. Try this to get going: https://people.richland.edu/james/lecture/m116/conics/hypdef.html
December 15, 2016

Algebra II
V = k/P, so VP = k, a constant so, you want V so that 2.2V = 20*16 By the way, L/cm^2 is not pressure. 1L = 1000cm^3, so L/cm^2 = cm Pressure is force/area, as in N/m^2 I've never heard of this L/cm^2 unit. But then, I'm not a physicist...
December 15, 2016

Algebra
h^2+27^2 = 38^2
December 15, 2016

algebra
9.6/3.2 * 10^(2-5) = 3.0 * 10^-3
December 15, 2016

algebra
2.5^4 * (10^-2)^4 = 39.0625 * 10^-8 = 3.90625 * 10^-7
December 15, 2016

Math
so the square must be 4x4 what do you mean when you say "all sides"? Only the sides, not the rows or columns, or diagonals? For 4 numbers to add to 25, either one or three of them must be odd. See what you can do with that.
December 15, 2016

calc
e^(x^2-x+a) if x < 1 as x->1-, f(x) -> e^a (4^x-x^2)) if 1<x<2 as x->1+, f(x) -> 4^1-1 = 3 as x->2-, f(x) -> 4^2-2^2 = 12 6In(x-b) if x>2 as x->2-, f(x) -> 6ln(2-b) so, we need e^a = 3 a = ln3 6ln(2-b) = 12 ln(2-b)=2 2-b = e^2 b = 2-e^2 But ...
December 15, 2016

Calc
?(5-x) is defined for x<5 so, using x<1 works there lnx is defined for x>0 so, x>1 works there except where x=25 So, f(x) is defined and continuous on (-?,1)U(0)U(1,25)U(25,?)
December 15, 2016

science
none, if it's limestone
December 15, 2016

algebra
just move the decimal point. to the left for negative powers to the right for positive powers
December 15, 2016

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