Sunday
February 26, 2017

Posts by steve

Total # Posts: 48,795

math
convert all to have the same power of 10, then it will be clear. For example, 2.3 * 10^5 = 230 * 10^3
February 9, 2017

Math
1/6 * 1/6 * 1/6
February 9, 2017

Precalculus
<k,2>•<3,5> = 0 3k+10 = 0 k = -10/3 gotta watch those ± signs!
February 9, 2017

Math
13/14 = 0.92857 = 92.857% The remainder from 13/14 is 13! Try some other number, say 72/13 = 5 7/13 = 5 R 7 The remainder is always less than the divisor, so 13/14 = 0 13/14 = 0 R 13
February 8, 2017

Finance
Which type of debt is the least attractive for a consumer? Unsecured debt Secured debt Mortgage debt Lease debt My answer is unsecured debt
February 8, 2017

Math
2(4+6) * $4.84
February 8, 2017

Math
no, that would make the answer 8m=102 ...
February 8, 2017

math
Note that you have two right triangles, with a common angle. So, they are similar, with all angles equal.
February 8, 2017

Algebra
well the function f is usually written in the form f(x) = 2x-2 so D looks like the choice intended. But saying Volume(radius) = 67 is a bit strange, since it implies that no matter which value "radius" has, the Volume remains constant at 67. If the value of Volume is...
February 8, 2017

math
I see that this time you omitted the instructions to make a Venn diagram. Did you do that, or are you just waiting for the answers? It appears that you must have meant 6 study only biology since you already said that 60 study biology. I think there is still something missing ...
February 8, 2017

Math
You might have check my solution given earlier before reposting the problem: http://www.jiskha.com/display.cgi?id=1486538658
February 8, 2017

examples of pop singers
Do you have some inappropriate ones in mind???
February 8, 2017

math
There are lots of online calculators, such as https://www.emathhelp.net/calculators/calculus-2/simpsons-rule-calculator/?f=1%2F%28x%5E5%2B7%29%5E%281%2F3%29&a=0&b=1&n=4&steps=on
February 8, 2017

anonymous
well, how many moles of CO2 in 66.50 grams? Use that and your balanced equation to see how many moles of benzene you need. Then convert back to grams.
February 8, 2017

math
well, you know that 2x = y-14 So, use that in the other equation: -4x = -2(2x), so -2(y-14)-y = 14 ...
February 8, 2017

English
exactly backwards. If the first sentence had to include the "was" then it is a progressive tense: was helping. Becca was {helped/helping} Corky with his homework last night. Similarly, the second sentence is a simple past tense: Blossom watched her best friend study ...
February 8, 2017

Math
28,000(1+2.5) = 98,000 70,000 is 250% of 28000, but that means that it increased by 150%. Gets kinda tricky, if you're not careful with the wording.
February 8, 2017

math
correct, assuming that Jack actually ate his slices ...
February 8, 2017

math
well, just do the math: .05 * 1250 = ?
February 8, 2017

Math
7:4 means the lemonade is 7/11 of the total. 7/11 = .6363 8:4 means 8/12 = .6666 I hope that was the reason you picked C.
February 8, 2017

physics
32@W = <-32,0> 11@N = <0,11> Resultant is <-32,11> = 33.8@W19°N
February 8, 2017

Math
If there are x students in all, 1/4 of the non-band students are in neither: 1/4 (x-12) = x/5 x/4-3 = x/5 x/20 = 3 x = 60 Check: 12 in band, leaves 48 others 36 in dance club 12 in neither
February 8, 2017

math
so, what is "the difference" of a circle?
February 8, 2017

Continuity Calculus Help
4x+3 = 11 at x=2 4x^2 = 16 at x=2 Since f(x) = 4x+3 for x <= 2, lim(x->2-) f(x) = 11 = f(2) But lim(x->2+) = 16 ? 11
February 8, 2017

Math
30/90 = 1/3 = 33.3%
February 8, 2017

Math
1/2(4x+2)+8x = (1/2)(4x) + (1/2)(2) + 8x = 2x+1+8x = 10x+1 time to review the distributive property: a(b+c) = ab + ac
February 8, 2017

Math
y = ax^3+bx^2+cx y' = 3ax^2+2bx+c y" = 6ax+2b Since y"=0 at x = -1, -6a+2b=0 3a-b = 0 y'=4 at x = -1, so 3a-2b+c = 4 y=-5 at x = -1, so -a+b-c = -5 Now you have the three equations 3a-b = 0 3a-2b+c = 4 a-b+c = 5 y = x^3+3x^2+7x The tangent line at (-1,-5) has...
February 8, 2017

MAth
well, all three angles add to 180...
February 8, 2017

math
just what does 85 of itself mean?
February 8, 2017

maths equation too hard
There is no general algebraic way to solve equations like this, but it should be easy to see that 3^3 = 3^3
February 8, 2017

algebra
c+r = 8.5 16c+8r = 112 Now just solve for c and r.
February 8, 2017

Math
y is the base Online, use ^ to indicate exponents, as in y^2 and y^4
February 7, 2017

math
since cos 2?/3 = -1/2, r(2?/3) = 0 So, the graph loops back to r=0 at ?=2?/3 Using symmetry, we need consider only the top half of the figure, so we just need to subtract the inner loop from the outer loop, giving us A/2 = ?[0,2?/3] 1/2 r^2 d? - ?[2?/3,4?/3] 1/2 r^2 d? A = ?[0...
February 7, 2017

math
It's easier to find the number of quarters: 10*3q + 25q = 385 55q = 385 q = 7 so, d=3q=21
February 7, 2017

Maths
assuming you meant 1/x + 1/(x+1) = 1 x+1 + x = x(x+1) x^2-x-1 = 0 ...
February 7, 2017

Maths
y/x * 80p
February 7, 2017

Math
80/10 = 8 bags
February 7, 2017

math
possibilities for what? a little more context would help.
February 7, 2017

math
-7/4 -73/100
February 7, 2017

Geometry
recall that the diagonals of a rectangle are equal.
February 7, 2017

Math
You just need to review the meanings of the 1st and 2nd derivatives. y = 3x^4-10x^3+12x^2+12x-7 y' = 12x^3-30x^2+24x+12 = y" = 36x^2-60x+24 = 12(3x-2)(x-1) max/min where y'=0 inflection where y"=0 max if y'=0 and y"<0 min if y'=0 and y"&...
February 7, 2017

math
3.14*10^8 --------------- = 0.046 or 4.6% 6.8*10^9
February 7, 2017

Math Limits
(a) 4 (b) 15 (c) -15
February 7, 2017

Math - Continuity of Functions
(x-2)/(?x-?2) = [(?x-?2)(?x+?2)]/(?x-?2) = ?x+?2 for all x?2 So, if k=2?2 f is continuous everywhere.
February 7, 2017

Maths
Draw a diagram. It should be clear that h cot60° = (h-10) cot30°
February 7, 2017

Math - Continuity of Functions
since |sin(1/x)|<=1 x*sin(1/x) -> 0 as x->0 f(0)=0 will make f defined everywhere.
February 7, 2017

math
Just use the point-slope form and pick any three values for the slope m: y+2 = m(x-6)
February 7, 2017

math
In retrospect, it would probably have been easier to work this one backwards, with no algebra: After round 3: 10,10,10 After round 2: 5,20,5 and so on...
February 7, 2017

math
If the start with amounts x,y,z after the 3 rounds, the holdings are x-y-z, 2y, 2z 2(x-(y+z)),4y,2z-(x-(y+z))-2y = 2x-2y-2z, 4y, 3z-x-y 2(2x-2y-2z), 4y-(2x-2y-2z)-(3z-x-y), 2(3z-x-y) = 4x-4y-4z, 7y-x-z, 6z-2x-2y So, now we have three equations: 4x-4y-4z = 10 -x+7y-z = 10 -2x-...
February 7, 2017

maths
From your sum-to-product formulas, sinA-sinB = 2 cos(A+B)/2 sin(A-B)/2 Using your values, that would be 2 cosx sin2y without knowing more about the relation between x and y, that's as far as we can go. If you supply the missing info, I'm sure you can finish it off.
February 7, 2017

math
k = m-4 k+3 = 2/3 (m+3) Now just solve for k and m.
February 7, 2017

Math
"10 to the power of 2" or 10^2 40 + x = 10^2 40+x = 100 . . .
February 7, 2017

Math
clearly the missing angle is 52° Find two corresponding sides with a known ratio, and use that ratio to find the missing values.
February 7, 2017

science
* ?
February 7, 2017

science
static electricity
February 7, 2017

math
If their ages are a < b < c then c = b+8 a = c-12 a+b+c = 88 ...
February 7, 2017

mensuration
6^2+8^2 = 10^2
February 7, 2017

Question on Integration
let x = 2sinh? x^2+4 = 4sinh^2?+4 = 4cosh^2? dx = 2cosh? d? Now the integral becomes ?x^3 / (x^2 + 4)^2 dx ?8sinh^3?/16cosh^4? 2cosh? d? ?tanh^3? d? see what you can do with that. using direct substitution, let u = x^2+4 du = 2x dx ?x^3 / (x^2 + 4)^2 dx (1/2)?x^2 / (x^2 + 4)^2...
February 7, 2017

Algebra
7d+2b = 11 2d+7b = 16 5d + 2(d+b) = 11 5b + 2(d+b) = 16 add the equations and you get 5(d+b) + 4(d+b) = 27 9(d+b) = 27 d+b = 3 similarly, b-d = 1 b=2 d=1 dog costs $1 burger costs $2
February 6, 2017

Math
Remember that a proportional relationship between x and y means that y = kx. There can be no extra constants floating around. A is a proportional relationship between y and x^2 Only C is a p.r between y and x. For #2, same thing applies.
February 6, 2017

Algebra2
Looks good to me
February 6, 2017

Algebra2
What is the product in simplest form? State any restrictions on the variable. 4a^5/7b^4 times 2b^2/2a^4 My answer is 4a/7b^2 except a=0 and b=0
February 6, 2017

Math
well, sinØ = 3/4 cosØ = ?5/4
February 6, 2017

Math
tan(-a) = -tan(a), so tan(a) = 5 so, cot(a) = 1/5
February 6, 2017

Algebra2
Thank you very much
February 6, 2017

Algebra2
Simplify the rational expression. State any restrictions on the variable. (n^4-11n^2+30)/(n ^4 -7n^2+10) My answer is n^2-6/n^2-2 except +-sqrt5 and +-sqrt2
February 6, 2017

math
sorry, an extra point is awarded by scoring an "extra point". A field goal is worth 3 points. At any rate, if they get the extra point after each touchdown, then their score for x touchdowns is y = 6x + 1x = 7x Saying the total score for "x" amount of ...
February 6, 2017

physics
(6000kg*9.8N/kg)/(4*.10m^2) = 147000N/m^2 = 147KPa
February 6, 2017

physics
what volume of water has a mass of 400kg? Divide that by 24m^2 to get the depth of the displaced water.
February 6, 2017

physics
2700 kg * 1m^3/1.25kg = 2160 m^3
February 6, 2017

Accelerated 1
# coins = c points = p point for star = 3p p = 10c
February 6, 2017

Math
If you mean y = 9x1/2 it is not even exponential. An exponential function has x in the exponent, such as y = 9 * (1/2)^x which would be decay, because powers of fractions get progressively smaller. If you don't know how to even make a chart, you are in trouble. For a chart...
February 6, 2017

Math
since time = distance/speed, 7.2*10^2km / 1.2*10^3km/hr = 0.6hr Now convert to minutes.
February 6, 2017

astronomy
mirrors, lenses
February 6, 2017

Algebra 2 help
Oh, please. In the first, place, you'd better go out and get a calculator. Or use your phone's calculator. Or, there are lots of calculators online. google, etc. wolframalpha.com allows you to give a formula and a value, such as http://www.wolframalpha.com/input/?i=4x...
February 6, 2017

math help quick please
stop guessing. Next step: 5x+2x-14 = 7 ... B works for the 1st equation, but not the second.
February 6, 2017

math help quick please
so, substitute y=x-7 into 5x+2y = 7 5x+2(x-7) = 7 ...
February 6, 2017

Math
see related questions below.
February 6, 2017

Algebra
x^3 + 5x^2 - 4x - 2 = (x-1)(x^2+6x+2) The discriminant of the quadratic is positive, so it has two real roots.
February 6, 2017

math
(3/8) / (3/4) = 3/8 * 4/3 = 1/2 Naturally. Since 1/8 is half as big as 1/4, so are three of them half as big as three fourths.
February 6, 2017

Maths
I think you meant 4;7;10;13 where An = 1+3n So, just solve for n where 1+3n > 150
February 6, 2017

Algebra
using the sum of two cubes, (x + 3)^3 + 10 = (x+3+?10)((x+3)^2 - (x+3)?10 + ?100) = x^2 + (6-?10)x + (?100-3?10+9) One root is clearly x = -(3+?10). You can see that the discriminant of the quadratic is negative, so there are no other real roots. Or, consider the graph. It is ...
February 6, 2017

Trig
since sin(x) = cos(?/2-x) arccos(t) + arcsin)t) = ?/2 In general, draw the triangle. In this case, take cosine of both sides. cos(arccos(t)) = t In your triangle, the adjacent side will be t, and the hypotenuse will be 1. The other leg is thus ?(1-t^2). So, sin(arccos(t)) = ?(...
February 6, 2017

MATH
The odds are 7:4 beat 4:7 lose, so 4/11 probability
February 6, 2017

Calculus
This is a trick question, in a way. You can go through the math of height and speed, using an unknown acceleration (you will find that this fails to have a solution when g=9.8 is used). Or, you can just note that since momentum is conserved, the speed at launch is exactly the ...
February 6, 2017

Math
the unknown sides are equal, say x. So, 54+x+30+x = 134 If you draw your trapezium and mark off the interior 30x30 square, you will find a right triangle at each end, with base 12 and hypotenuse x. So, the height of the trapezium is ?(x^2-144) making the area A = (30+54)/2 ?(x...
February 6, 2017

algebra 2
you need to get your typing straight × is the symbol for multiplication x is a variable name 9 (9 - 8x) = 2x + 3 81 - 72x = 2x + 3 78 = 74x x = 78/74 = 39/37 Note that you cannot subtract the 2x inside the parentheses. You have to expand the left side first. Try it with ...
February 6, 2017

algebra 2
[-4b -8] + [-1b -b^2] + 2b^3 plug in b=2 (-4(-2) - 8) + (-1(-2) - (-2)^2) + 2*(-2)^3 (8-8) + (2-4) + 2(-8) 0 - 2 - 16 -18
February 6, 2017

Math
400 mL of 1/2 strength juice contains 200 mL of juice Adding 100 mL of juice makes 500 mL containing 300 mL juice, or 60% juice.
February 6, 2017

math
Change the fractions to have the same denominator: 1/3 , 5/6 , 4/3 = 2/6, 5/6, 8/6 The numerators are 2,5,8 Clearly, 3/6 = 1/2 is added each time.
February 6, 2017

Maths
density of A: 1.2kg/(20*10*5)cm^3 = 1.2/1000 = 0.0012 kg/cm^3 = 1.2 g/cm^3 Block B is 6cm on a side, with a density of 1.2*1.4 = 1.68 g/cm^3 So, its mass is 1.68 g/cm^3 * 216cm^3 = 362.88 g = 0.36 kg
February 6, 2017

math
The amount of work is 8hr/day * 13men * 15day = 1560 man-hr So, you want x so that 10*26*x = 1560 x = 6 days
February 6, 2017

Algebra (plz)
(a+b)^2 = a^2 + 2ab + b^2 You need the first and last terms to be perfect squares, and the middle term to be twice their product. 4m^2-4mp+p^2 = (2m-p)^2 16s^2+56s+49 = (4s+7)^2 16c^2+72cd+81d^2 = (4c+9d)^2
February 6, 2017

las st
The vertical and horizontal distance components of the flare are y = 2400 + 120t - 4.9t^2 x = 207.84t The flare hits the ground when t=37.54 The tangent of the angle of direction at time t=37.54 is dy/dx = (120-9.8*37.54)/207.84 = -1.193 So, ? = -50° I am assuming that the...
February 6, 2017

Math
Hmmm. If m is the number of correct answers, then s = 5m-3(10-m) = 8m-30
February 5, 2017

math
I expect some information about g will help ...
February 5, 2017

Intermediate Algebra
same problem: If there are x liters of 25%, then the rest (50-x) is 60%. So, .25x + .60(50-x) = .40 * 50
February 5, 2017

Algebra
48/5
February 5, 2017

Math
it gains 1 meter each day. After 9 days it has climbed 9 meters On the 10th day it climbs 3 meters and is out.
February 5, 2017

Math
so, is -18 the max or the min? There is a double root at x=1, where it just touches the x-axis. It crosses the x-axis at x = -4 Since this is a cubic polynomial, with negative leading coefficient, it drops down from the left. So, it is decreasing on (-?,-4) and beyond to the ...
February 5, 2017

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