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March 25, 2017

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Posts by STEVE

Total # Posts: 49,586

Algebra2
What is an equation of a parabola with the given vertex and focus? vertex(-2,5) focus(-2,6)
March 8, 2017

Probability: Combinations
6C2 = 6*5/2 = 15
March 8, 2017

Algebra2
Write an equation of a parabola with a vertex at the origin and a directrix at y=-5. my answer is focus 6,0, directrix =-6
March 8, 2017

Algebra2
thank you
March 8, 2017

Algebra2
-3x^2+12y^=84 What are the domain and range My answer domain: all real numbers range: y (less than -) -sqrt7 or sqrt7
March 8, 2017

Algebra2
What are it's line of symmetry? 4x^2+y^2=9 my answer is it has 2 lines of symmetry, the x and y axis
March 8, 2017

maths
If there are e erasers, p pencils, and q pens, we have 2e+4p = 240 6e+p+2q = 395 e+p+4q = 415 If A is the matrix of coefficients, then A^-1 = 1/84 (-2 16 -8) (22 -8 4) (-5 -2 22) Then you have (e p q) = (30 45 85) See here: http://www.wolframalpha.com/input/?i=inverse+%7B%7B2,...
March 8, 2017

Science
No ideas? Surely you have a calculator.
March 8, 2017

Algebra2
thank you
March 8, 2017

Algebra2
4x^2+4y^2=64. what are the domain and range? my answer is domain;all real numbers range;-4<=4<=4
March 8, 2017

Math c2
well, 3?(x^2+1) = ?(9x^2+9) = ?(3x)^2 + 9) So, it looks like a horizontal compression by a factor of 3.
March 8, 2017

Math
well, for usage over 50 therms, the bill for x therms is y = 67.65 + 1.1917(x-50) So, plug in your y values and solve for the x values.
March 8, 2017

maths
well, where is x^2-x-6 = 0? You cannot divide by zero, and the square root is not real for negative values, so ... the domain is x values where x^2-x-6 is positive.
March 8, 2017

algebra
Think about it like this. With 5 types of seeds, there are 5 choices for the 1st flower. For the 2nd flower, there are only 4 choices. For the 3rd flower there are 3 choices. Now you know how many ways the 3 flowers can be planted. But if all you want is the combinations, the ...
March 8, 2017

math
4x^2+19x-5 = (4x-1)(x+5) The roots (places where the graph crosses the x-axis) are -5 and 1/4 So, where do you think the value is negative?
March 8, 2017

Precaculus
(0.1 cm^3)/(4?/3 * (5*10^-3 cm)^3) = 0.1/(5.24*10^-7) = 190986 cells V(t) = 0.1 * 2^(t/20)
March 8, 2017

maths
you know the circumference of a circle is ?d, right? Think of the circle as a round piece of string. Cut it and lay it out straight. That's how far the wheel travels in one complete turn.
March 8, 2017

Math
sum means add (product means multiply) same mistake. "/" means divide -8n ok your answers are ok if you meant x+(-3) times means multiply. You really seem to have a problem here... and yet you got y-5 correct.
March 8, 2017

Math
2(80+x) = 410 area = 80x
March 8, 2017

Math
well, he spent 1/4 + 1/3 + 1/5 = 47/60
March 8, 2017

English
clearly, neither. It just mentions shoes of no specific kind.
March 8, 2017

Math
5P2 * 12P4 = ?
March 8, 2017

Algebra 2
or, for a more condensed presentation, type in your coefficients here and see all the details. http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
March 8, 2017

Math
they must be flying in the same vertical plane, if they are traveling with an angle relative to the horizontal ... Also, I suspect A's speed is 100?3 m/s, not mi/s. Using the law of cosines, 500^2 + (100?3 t)^2 - 2(500)(100?3 t)(?3/2) = (100?3 t)^2 They will crash in 5/3 ...
March 8, 2017

science
well, how many moles of Fe2O3 in 108kg? Now balance the equation: Fe2O3 + 3CO -> 2Fe + 3CO2 Now you can see how much CO is used.
March 8, 2017

Math
well, 27+28 = 55
March 7, 2017

calculus
the 3-foot radius and 2-foot depth means that y = 2/9 x^2 The arc length of the parabola is ?[0,3] ?(1+y'^2) dx Now just rotate that, remembering that the circumference of a circle is 2?r.
March 7, 2017

Math
well, what about zero factors?
March 7, 2017

math
2(w + w+9) = 110
March 7, 2017

ATI TEAS 6 practice
as for the -20x+20, 5(x-2)^2 = 5(x^2-4x+4) = 5x^2-20x+20
March 7, 2017

ATI TEAS 6 practice
not much factoring here. 5(x-2)^2 = 125 (x-2)^2 = 25 x-2 = ±5 x-2 = +5: x = 7 x-2 = -5: x = -3
March 7, 2017

Math age problem/ Solving Multi step Equations
a = 2m-15 a+m = 12 ...
March 7, 2017

Calculus Answer Check
good numbers, but what about [0,10]?
March 7, 2017

Math
*sigh* 7 5/16 + 3 3/4 = 7 5/16 + 3 12/16 = 7+3 + 5/16+12/16 = 10 17/16 = 11 1/16 clearly you need to review operations with fractions.
March 7, 2017

Math
7 5/16 + 3 3/4 place fractions over a common denominator and add.
March 7, 2017

math
42
March 7, 2017

Hot math questions
not if S is the number of shoes in S/2 pairs ...
March 7, 2017

Maths trigonometry
trés simple -- x = Sin Alfa / (335sin59) now just get out your calculator. sure looks like a Law of Sines problem to me.
March 7, 2017

FUR. MATHS
judging from the student's alleged name, we want something like (f?g)(x) = f(g) = 2g-1 = 2(5-2x)-1 = ...
March 7, 2017

Algebra math 150
I guess it depends on what you are trying to do...
March 7, 2017

maths
The range of f^-1(x) is (-9/4,?) x = (1-5y)/(2y) 2xy = 1-5y y = 1/(2x+5) so, f(x) = 1/(2x+5) domain is (-9/4,?)
March 7, 2017

Math
?[1,5] (ln2x - lnx) dx = ?[1,5] ln2+lnx-lnx dx = ?[1,5] ln2 dx = 4ln2
March 7, 2017

Geometry
Hard to say what you did wrong, since you didn't show your work. First, learn to use parentheses: 9/(4x-2) = 12/(3x+2) 9(3x+2) = 12(4x-2) 27x+18 = 48x-24 21x = 42 x = 2
March 7, 2017

Long Division
SEE ALL THE DETAILS HERE: http://calc101.com/webMathematica/long-divide.jsp
March 7, 2017

math
if you say so. Hard to tell, since you don't say when you leave...
March 7, 2017

calculus
Each shell has thickness dy and height x = 2/y So, the volume v is v = ?[2,4] 2?rh = ?[2,4] 2?y(2/y) dy = ?[2,4] 4? dy = 8? As a check, you can use discs, getting v = ?(4^2-2^2)(1/2) + ?[1/2,1] ?(R^2-r^2) dx where R=y and r=2 v = 6? + ?[1/2,1] ?((2/x)^2-2^2) dx v = 6?+2? = 8?
March 7, 2017

math question
so, move left-right 1 and up-down 2 or left-right 2 and up-down 1. One such point will be (1+1,2+2) = (2,4) I think you will find 8 such points, not 4.
March 7, 2017

maths
I can't figure out what circle (O, OP ) is passing from A means.
March 7, 2017

maths
I assume that "circle (P,12)" means a circle with center at P and radius 12. If so, then the distance between the circles is 25-12-5 = 8 Draw the diagram. Label O the point midway between the circles. Then we have two right triangles PAO and QBO PO=16 and PA=12 QO=9 ...
March 7, 2017

Geometry
surely you know that the circumference of the semi-circle is 300? so, add that to the 3 straight sides,
March 7, 2017

Precalculus
6
March 6, 2017

math NEED HELP ASAP
.60x + 1.00(120-x) = .70*120
March 6, 2017

Calculus
either 5+2/x < 1 or -(5+2/x) < 1 In the first case, x is in (-1/2,0) In the 2nd case, x>0 or x < -1/3 . . .
March 6, 2017

Math
so, just solve for d when -0.02d^2+2.6d-66.5 = 0
March 6, 2017

Math
#1 y = (3/4)x+b 7 = (3/4)*4+b b=4 so, y = (3/4)x+4 Clearly (0,0) does not satisfy that equation #2 x/y can be zero if x=0 Only y cannot be zero. #3 ok #4 volume is always in cubic units. Area is square units. #5 85+92+80+90+x = 5*89 x = 98 How could you possibly believe such a...
March 6, 2017

math
do the () first 10-7=3 3 squared=9 4 times 9 =36 36 times 7 =252 252+4=256
March 6, 2017

math
subtract the 25 from 14
March 6, 2017

math
15+19=34 34-6=28 28/2=14 14-25=negative 11
March 6, 2017

Algebra2
thank you very much
March 6, 2017

Algebra2
find a quadratic function in standard form for each set of points. (-1,2),(0,1),(1,-4)
March 6, 2017

mathemadics
come on. Take a stick and break it into thirds. How many pieces are there?
March 6, 2017

math
at 3 m/s, time t: 3t time t+1: 3(t+1) = 3t+3
March 6, 2017

Math
coconut: (3/5)(1/3) = 1/5 angel: (2/5)(1/6) = 1/15 assuming no cakes are coconut ... If all the cakes are either coconut or angel food, then coconut: (3/5)(1/3) + (2/5)(5/6) = 8/15
March 6, 2017

Algebra
how about 7*2*9 ?
March 6, 2017

Algebra
2 legs per animal yields 26 legs There are 6 extra legs, so what does that say? Think about what happens when you replace a chicken with a sheep.
March 6, 2017

Calculus
Too bad you didn't show your work... f' = 1 + 2cosx f'=0 when cosx = -1/2 x = 2?/3, 4?/3 f" = -2sinx f"(2?/3) < 0, so that is a maximum f"(4?/3) > 0, so that is a minimum See the graph at http://www.wolframalpha.com/input/?i=x%2B2sinx,+for+x+%...
March 6, 2017

Math
m = kh now plug in your numbers
March 6, 2017

Math
a:b = 3:8 b:c = 1:6 = 8:48 a:b:c = 3:8:48 a:c = 3:48 = 1:16
March 6, 2017

Math
no idea what the shaded region is.
March 6, 2017

Algebra
plot each line and the solution is where they intersect.
March 6, 2017

math 73
add up the amount of fat in the milk and cream. It must equal the amount in the mix. If there are x gallons of cream, then the rest (20-x) is milk. So, .22x + .02(20-x) = .04(20)
March 6, 2017

Geometry
2(w+78) = 260
March 6, 2017

maths curve need help
First step: draw the graphs! They intersect at (0,0) and (1,1). You want to rotate a small lens-shaped area. To find the volume, you can do two methods. Think of the volume as a stack of discs with holes (washers). The holes are there because a slice of area is rotated around ...
March 6, 2017

Math
#1 #2 are ok the volumes are in the cube of the linear ratio. So, v' = (10/15)^3 v = 8/27 v = 160 This is due to the fact that each dimension scales the same way. In the case of the sphere, replace r by (2/3)r in the formula. Then you get v = 4?/3 r^3 v' = 4?/3 (2/3 r...
March 6, 2017

Algebra2
a = a1 = 2*1-3 = -1 d = an+1-an = (2(n+1)-3)-(2n-3)) = 2 Now just use your sum formula S10 = 10/2 (2a+9d)
March 6, 2017

Algebra2
What is the sum of the first 10 terms of the sequence defined by an = 2n - 3?
March 6, 2017

Math
good start, but 16 years means 32 payments.
March 6, 2017

physics
recall that the index n is defined by n = c/v
March 6, 2017

Calculus
I assume a triangular cross-section. So, the width of the water surface when it has a depth of y is y/2. Thus the volume of water of depth y is v = (1/2)(y)(y/2)(8) = 2y^2 dv/dt = 4y dy/dt Now just plug in your numbers
March 6, 2017

math
same as for any regular n-gon: area = 1/2 perimeter * apothem But it will be very close the the circle.
March 6, 2017

Trig
well, (u-3)(u+1)/(u+1) = u-3 as long as u ? -1
March 5, 2017

Algebra
yes
March 5, 2017

Algebra
don't you recognize 8^2 and 9^2 ?
March 5, 2017

Maths
2(5x+3x) = 128 x = 8 so, ...
March 5, 2017

Algebra
well, 32 = 2^5 that should help
March 5, 2017

Calculus
e^(ax) = e^(a/b * bx) = (e^(a/b))^(bx) C = e^(a/b)
March 5, 2017

Geometry
42
March 5, 2017

Calculus
If I read all those words correctly, you mean ?[-3,3] f(x) dx where f(x) = f1: ?(4-?(x+1)) for -3 <= x <= 1 f2: |x-2|-1 for 1<x<3 Unfortunately, for x < -1 the first piece is complex, not real. Anyway, fix the presumed typo and just plug in the pieces ?[-3,1] f1...
March 5, 2017

math
Draw the figure. If the height is h, then you have a 40-by-h rectangle in the center, with extra lengths of x and 25-x on the longer base. x^2+h^2 = 56^2 (25-x)^2+h^2 = 39^2 x^2-56^2 = (25-x)^2 - 39^2 x = 224/5 so, h^2 = 56^2-x^2 = 28224/25 h = 168/5 so, the area is (40+65)/2...
March 5, 2017

Math/Calculus
Consider the set of nested shells of thickness dy. v = ?[0,4] 2?rh dy where r=y and h=218-x = (y+2)^3+2 v = ?[0,4] 2?y(218-((y+2)^3+2)) dy = 8192?/5 as a check, using discs of thickness dx, v = ?[10,218] ?r^2 dx where r=y=(x-2)^(1/3)-2 v = ?[10,218] ?((x-2)^(1/3)-2)^2 dx = ...
March 4, 2017

Calculus
assuming you mean 1<=x<=5, we have, using discs, v = ?[1,5] ?(R^2-r^2) dx where R=x^(1/5) and r=(x/5)^2
March 4, 2017

Calculus
each triangle at a distance x from (0,0) has a base of 2y = 2?(64-x^2) So, the total volume, taking advantage of symmetry is v = 2?[0,8] bh/2 dx = 2?[0,8] 2?(64-x^2)*2?(64-x^2)/2 dx = 4?[0,8] (64-x^2) dx = 4096/3
March 4, 2017

Calculus
Find the volume of the solid whose base is the circle x^2+y^2=64 and the cross sections perpendicular to the x-axis are triangles whose height and base are equal. Find the area of the vertical cross section A at the level x=7.
March 4, 2017

calculus
h^2 = 6^2 + x^2 h dh/dt = x dx/dt when h=10, x=8, so just plug in the numbers 10 dh/dt = 8*2 dh/dt = 8/5 m/s
March 4, 2017

math
The only way I can make sense of what you wrote is to interpret it as p = mq^3 q = nr^2 p = m(nr^2)^3 = mn^3 r^6 = kr^k p varies directly as the 6th power of r.
March 4, 2017

Calculus AP Exam review explanation pls
#1. Recall that the average value is 1/? ?[-?,0] 3^cos(x) dx use your calculator to find that the integral is 4.16348 Divide that by ? and you get 1.32528 #2 is just another integral. Just as distance is ? v(t) dt, here the total change in momentum is ? cost dt since ? p = F ?...
March 4, 2017

Algebra 2
correct
March 4, 2017

math
35/60 of the circumference of a complete circle of radius 6 cm.
March 4, 2017

math
The distance between pencil centers on each side is 1 diameter, or 7mm. At each corner there is a quarter-circle, so the entire length is 4*7 + ?*7 = 7(4+?) mm
March 4, 2017

math
Draw the diagram, with two congruent triangles at the ends. Notice that the two right triangles are 6-8-10.
March 4, 2017

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