Sunday
December 21, 2014

Posts by Steve


Total # Posts: 27,653

Algebra 1
What about from the following answers 0,1 -1,0 1,0 0,0 I'm a 68 year old grandfather trying to help his grandson.
December 20, 2014

Algebra 1
the solution set for y<x is half of the plane. There are infinitely many points on each axis which satisfy the inequality.
December 20, 2014

Algebra 1
Which point on the axis satisfies the inequality y<x?
December 20, 2014

Algebra 1
What about from the followuing answers 4 -2 2 -4
December 20, 2014

Algebra 1
the point on the x-axis is where y=0, SO x - 2y <= 4 now plug in y=0 and you can see what x is. I think you need a bit more information here.
December 20, 2014

Algebra 1
In the graph of the inequality X - 2y is less then or equal,to 4, which is a value for x on the inequality line and the x axis?
December 20, 2014

Algebra 1
I'm 68 years old and don't remember some of these things and am trying to help grandson.
December 20, 2014

Algebra 1
draw the axes. Label each quadrant ++ +- -+ or -- and then let us know, ok?
December 20, 2014

Algebra 1
If x is greater then or equal and y is greater then or equal to 0 then which quadrant holds the solution?
December 20, 2014

Algebra 1
the rate of change is the slope of the line. That is, if x changes by 1, how much does y change? In the slope-intercept form, the rate of change (slope) is m, in y = mx+b The point-slope form of a line is y-k = m(x-h) where the line passes through (h,k) with slope m. It's ...
December 20, 2014

physics
well, you know the equation of motion is h(t) = vt - 4.9t^2 So, h is max at t = v/9.8 So, plug in t=v/9.8 into vt - 4.9t^2 = 1.5 and solve for v.
December 20, 2014

physics please help
If thrown down with initial velocity v, then just solve 109 - vt - 4.9t^2 = 0 plug in t=2.40 and find v.
December 20, 2014

Physics please help
the equation of the height is h(t) = 29t - 4.9t^2 Now just find the vertex of the parabola for the max height. Of course, the ball comes down exactly as fast as it went up -- got to conserve that momentum, eh?
December 20, 2014

ap calc
f(0) = 0 f(√π) = 0 So, we need c in (0,π) such that f'(c) = 0 f'(x) = 2x cos(x^2) 2x cos(x^2) = 0 Clearly c=√(π/2) satisfies the theorem.
December 19, 2014

Math
just divide each y by its x. Is the ratio constant? If so, that means y/x = k,or y=kx, a direct variation.
December 19, 2014

math
We have a winner!
December 19, 2014

Math
Note that y increases 5 when x increases 1. So, the rule will look like y = 5x But, when x=0, 5x=0 and we want y = -3. So, y = 5x-3
December 19, 2014

Intermedia Algebra
well, you have the formula. Use it. What do you get?
December 19, 2014

Algebra
Neil: 2 mi/hr current: 1 mi/hr Check: In 1 hour, Neil rowed 1 mi upstream. In 1 more hour, he rowed 3 mi downstream back to camp In those 2 hours, the log floated 2 miles downstream to camp
December 19, 2014

math
Hmph. Musta missed that. Using 22/7 for pi is just not rational!
December 19, 2014

math
so, what does 22/7/2 mean?
December 19, 2014

math
A makes 3x B makes 4x A spends 4y B spends 5y So, A saves 3x-4y B saves 4x-5y So, can you solve (3x-4y)/(4x-5y) = 9/10 ? 10(3x-4y) = 9(4x-5y) 30x-40y = 36x-45y 6x = 5y Can't happen try the other fractions.
December 19, 2014

Math
dy = 1/3 x^-2/3 dx At x=4, dy = 1/48 dx So, use dx=0.2 to find dy, and add that to y(64)=4 Note also that since the slope is 1/48, y-4 = 1/48 (x-64)
December 19, 2014

Math
this is just algebra I, after finding the slope of the tangent line... since y = x^(1/3) y' = 1/3 x^-(2/3) y(27) = 3 y'(27) = 1/9 So, now you have a point and a slope, so the line is y-3 = 1/9 (x-27) I'll let you massage the equation. Now you can use that line to ...
December 19, 2014

Math
since v = 4/3 pi r^3 and c = 2pi r, r = c/2pi, and v = 4/3 pi (c/2pi)^3 v = 1/(6pi^2) c^3 so, dv = 1/(2pi^2) c^2 dc so, now you have dc and can evaluate dv
December 19, 2014

math
Post a problem, showing your work as far as you got. Hope someone who knows something drops by to help out.
December 19, 2014

precalculus
[-7,-4)U(-4,-1)
December 19, 2014

precalculus
revenue r(x) = (1000+4x)(500-8x) Just find the vertex of that parabola to get the x desired, then figure the other items based on that.
December 19, 2014

Algebra
ever hear of the slope-intercept form of the line? Just plug in the numbers given.
December 19, 2014

math
A makes 4x B makes 3x A saves 3x/4 So, A spends 4x - 3x/4 = 13x/4 B spends (4/5)(13x/4) = 13x/5 So, B saves 3x - 13x/5 = 2x/5 The savings ratio is thus (3x/4):(2x/5) = 15:8
December 19, 2014

algebra
I think you need to (a) indicate how far apart are the integers (b) just what it is you want to know.
December 18, 2014

math
Hard to say: out = in-16 ? out = in/3 ? out = 2 * in(mod 5) ? One data point does not give much to go on.
December 18, 2014

Algebra 1
depends on the equations. Mainly, as with most things, skill comes with practice. Just doing the 5 assigned homework problems isn't going to give you the practice you need. I'm good at it because I have done hundreds of them.
December 18, 2014

Algebra 1
When solving a system of equations, how do you determine which method to use?
December 18, 2014

Algebra math
have you considered taking a typing class? You want to find when the height h: 80t - 16t^2 = 0 16t(5-t) = 0 I think it's clear now when h=0. (Just in case you haven't figured it out, the ball hits the ground when the height is zero...)
December 18, 2014

Algebra 1
thank you
December 18, 2014

Algebra 1
Which method would be the simplest way to solve the system? 7x +5y = 19 -7x-2y = -16 graphing substitution elimination or distributive
December 18, 2014

Algebra 1
I forgot my answer which is quadrant III.
December 18, 2014

Algebra 1
In which quadrant does the solution ofthen system fall? y=x-1 y= -3x-5
December 18, 2014

Algebra 1
$7.00 Thank you
December 18, 2014

Algebra 1
The cost of 4 scarves and 6 hats is $52.00. The cost of 2 hats is $1.00 more than the cost of 1 scarf. What is the cost of 1 scarf?
December 18, 2014

Algebra 1
Thank you
December 18, 2014

Algebra 1
zero solutions. -3x+6y cannot equal both 10 and -4. The lines are parallel, and so, do not intersect.
December 18, 2014

Algebra 1
The first line should read -3x
December 18, 2014

Algebra 1
How many solutions does this system have? *3x + 6y = 10 -3x + 6y = -4
December 18, 2014

algebra 1
that is correct. If you dislike working with fractions, you can start over and eliminate y instead of x.
December 18, 2014

algebra 1
-16x-2y=-18 8x+y=9 Multiply the 2nd by 2 to get -16x-2y=-18 16x+2y = 18 These are the same line. There are infinitely many solutions. Any point on one line is also on the other, as the lines coincide.
December 18, 2014

physics
when you say constant velocity, that means zero acceleration.
December 18, 2014

Chemistry
(.0658*0.3)/(.015)
December 18, 2014

Math
count the deposits, and count the amounts: If there were x deposits at $5, and y at $3.50, then we know x+y=14 5x+3.50y=59.50 Now just plug and chug.
December 18, 2014

Chemistry
Since PV is constant, and you have increased the volume by a factor of 1000, the pressure is reduced by a factor of 1000.
December 18, 2014

math
Since the 54% and the 63% grades count as 80% of her grade (and assuming therefore that each counts as 40%), the final grade is (54+63)(0.4) + 80(.2) = 62.8
December 18, 2014

math
If they sell x tacos, the profit for the day is 3.25x - 210 So, set that > 0 and solve for x.
December 18, 2014

Math
correckit!
December 18, 2014

Math
if it is not included, then you subtract it from the total. So, ...
December 18, 2014

math algebra
Since y is the cost of a sandwich with x extra veggies, the y-intercept is the cost with 0 veggies. the two extra veggies (5-3) cost $1.00 more. So, the veggies are $0.50 each. That means 0 extra veggies (the y-intercept) must be at 5.25-1.50 = 3.75 Looks like (D) to me y = 0....
December 18, 2014

physic
well, torque = radius * force T = rF if the radius is doubled, the new torque is T' = (2r)F = 2rF = 2T
December 18, 2014

Physics
If he cleared the bar at the top of his swing, then all his speed was horizontal, at 10.2 m/s. All that stuff about mass and height is just noise. Trying to incorporate other forces is impossible without further data.
December 18, 2014

Physics
speed s is found by conserving momentum: 800s = 3*10 time = 6.4/s
December 18, 2014

math
d/dr (r^3) = 3r^2 It's just the normal power formula So, dV/dr = (4/3)pi (3r^2) dV = 4pi r^2 dr Don't lose track of the dr when doing related rates
December 18, 2014

Math
well, dy = -1 / 2√(7-x) dx So, just plug in your numbers
December 18, 2014

algebra
you need an equation for the number of plays and the points for them: x+y = 21 3x+y = 49
December 18, 2014

math
The price p for e eggs is p/e = 1/6
December 18, 2014

Math
well, just compare the two plans for how much it costs the patient: 400 + 0.35(x-400) > 1000 + 0.25(x-1000)
December 18, 2014

math
.85p = 76
December 18, 2014

Math- algebra
well, you want y when x = -b/2a = 26/32 google will evaluate many algebraic expressions. Just type it into the search box.
December 17, 2014

math
15/x = cos 60°
December 17, 2014

math
clearly, 23.25/3 or 7.75
December 17, 2014

math
well write the ratios and see which are the same when reduced to lowest terms. For example 6/3 and 20/10 are the same ratio
December 17, 2014

Algebra 1
Describe how the graphs of y = absolute x and y = absolute x +2 are related.
December 17, 2014

Calculus
since f'(x) = -1 which is never zero, there are no relative min or max points. So, the extrema will just be the values at the endpoints of the interval. So, just find f(-1) and f(2). I mean, don't forget your Algebra I just 'cause you're in calculus now. f(x) ...
December 17, 2014

math
25q+5n+10d = 4500 q = 5n n = 3d So, start substituting and the values will become clear.
December 17, 2014

AP AB Calculus
(c),(d) just plug in 4.2 for x and solve for y. That will be the value for k. Since (d) will be a cubic in y, it might take a graphical solution.
December 17, 2014

Algebra 1
Write the equation of a line that is perpendicular to the given line and that passes through the given point. y-3 = 8/3 (x+2); (-2,3)
December 17, 2014

Math
u^-3 = 1/125 u^-3 = 5^-3 u = 5 y-1 = 4y - 2/3 3y-3 = 12y-2 9y = -1 y = -1/9 The y-intercept is where x=0. Clearly when x=0, y = -5, not 5. If she ran x miles, then we know that x+40 = 10+4x x = 10 If you want the slope, try writing the equation is slope-intercept form: 4x-6y+...
December 17, 2014

Algebra
I'd do C
December 17, 2014

Algebra 1
just change the slope to -1/(8/3)
December 17, 2014

Algebra 1
Write the equation of a line that is perpendicular to the given line and that passes through the given point. y-3 = 8/3(x+2); (-2,3)
December 17, 2014

Math! 2 question! Need help!
why not just review your point-slope form? The line passing through (h,k) with slope m is y-k = m(x-h) Now just plug in your values.
December 17, 2014

calculus honor
hey, honor student -- find what when x=1?
December 17, 2014

calculus
v = pi r^2 h dv/dt = pi r^2 dh/dt
December 17, 2014

calculus
a = pi r^2 da/dr = 2pi r
December 17, 2014

Math( Can you help me with starting this problem)
hmm. They gave you the formula, so just use it: v = 4/3 pi r^3 dv/dt = 4pi r^2 dr/dt So, just solve for dr/dt
December 17, 2014

caculus
If the base of the ladder is x from the wall, and the top of the ladder is y high, then x^2+y^2 = 10^2 x dx/dt + y dy/dt = 0 So, figure y when x=6 and just plug in the numbers to find dy/dt.
December 17, 2014

Algebra
so, plug in the numbers. solve for t when h=84 and 0
December 17, 2014

math
(2.6)(2.2)x10^(-4+8) = 5.72 x 10^4
December 17, 2014

Algebra 1
Tell whether them lines, for each pair of equations are parallel, perpendicular, or neither. y= -1/4x +10 -2x+8y=6
December 17, 2014

math
the three sizes clearly have different constants. For n dozen eggs, For the one-dozen size, p = 2(6.00n) For the half-dozen size, p = 2.18n For the 1 1/2-dozen size, p = (2/3)(3.00n)
December 17, 2014

Algebra 1
thank you
December 17, 2014

Algebra 1
Tell whether the lines for each pair of equations mare parallel, perpendicular, or neither. y= -2x+4 -5x+10y=5
December 17, 2014

math
My answers: 1. B 2. C 3. C 4. A
December 17, 2014

Algebra 1
Write an equation for the line that is parallel to the given line that passes through the given point. y=3x+7; (2,10)
December 17, 2014

math
I assume you mean leveling the ground for the roads. 3(225*5 + 175*5) = ? This assumes that the intersection is leveled twice.
December 17, 2014

Algebra
just factor y to get y = x(85-16x) So, what is x when y=0 (that is, when it hits the ground)?
December 17, 2014

Algebra II
If there are x price decreases, then price = 6.00 - .25x or 6-x/4 demand = 330 + 15x Since revenue = price * quantity, r(x) = (6-x/4)(330+15x) = -15/4 x^2 + 15/2 x + 1980 Now use what you know about parabolas to find the vertex. Since this parabola opens downward, the vertex ...
December 17, 2014

Math
If side x is parallel to the river, xy=1800 The perimeter is p = 2(x+y) = 2(x + 1800/x) p is a max when 1 - 1800/x^2 = 0, or x = 30√2 So, the field is 30√2 by 30√2 As usual, maximum area (or minimum perimeter) is achieved by a square.
December 17, 2014

Maths
h = 2g 2h+4g+h+g = 99 So, 11g = 99 g=9 9 goats and 18 hens
December 17, 2014

Mathematics
the first thing I'd do is divide by 20E6 and get 2/x - 3/(.5-x) = 0 2/x = 3/(.5-x) 2(.5-x) = 3x 1 - 2x = 3x x = .2
December 17, 2014

Math
amplitude = (8-5)/2 period = (5π-3π)*2 = 4π Assuming the cited min and max are consecutive extrema (that is, half the cycle)
December 16, 2014

Algebra
(3x+4)^5 = 4^15 = (4^3)^5 So, 3x+4 = 4^3 = 64 x = 20 That's the only solution I see.
December 16, 2014

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