Tuesday
January 24, 2017

Posts by STEVE

Total # Posts: 47,985

Math
v = ?/4 * 0.5^2 * 100 = 25/4 ? ft^3
December 3, 2016

Math 10
20C3
December 3, 2016

History
Which is an impact of World War 1 A: German and Russian monarchies became stronger. B: The united states became the largest creditor nation. C: Europeans used their money to buy American goods. D: France no longer had a demand for British goods. My answer is B
December 3, 2016

Math
A prime number is a number whose factors are only 1 and itself like 17 is a prime number because it's only factors are 1 and 17. 25 is a composite number because it has other factors besides 1 and itself, 25. The factors of 25 are 1,5,and 25. That's why it's a ...
December 3, 2016

Math
well, 16/60 = 26.67% so, what % scored less?
December 3, 2016

intermediate algebra
well, it will double three times, right? So, that's 8 times the original amount...
December 3, 2016

Math
A man left 3/7 of his money to his wife, 1/2 of the remainder to his brother, and the rest he divided equally among his three children. If each of his children received $400, how much did his wife receive? starting with x, 3/7 went to wife, leaving 4/7 1/2 of that, 2/7, went ...
December 3, 2016

math
he spent the remainder of the 5 hours. That is, 5 - 2 3/10 = 2 7/10
December 3, 2016

Algebra
posting it again won't get it any more attention, especially after just 11 minutes! Just wastes your time and ours.
December 2, 2016

Algebra
8 - 3/4 c = 5 -3/4 c = -3 c = -3 * -4/3 = 4 check: 3/4 * 4 = 3 8-3 = 5
December 2, 2016

Math
well, these two angles add up to 90 degrees, right? So solve for x, and you can get the angle measures.
December 2, 2016

Math - Calculus @My bad.
Never mind. I rotated around the line y = -1.
December 2, 2016

Math - Calculus
The graphs intersect at (-4/3,32/3) and (1,6) We are only interested in x>0, so the volume is using discs v = ?[0,1] ?(R^2-r^2) dx where R=8-2x and r=6x^2 v = ?[0,1] ?((8-2x+1)^2-(6x^2+1)^2) dx = 782?/15 Since we are rotating around the line x = -1, the radius is increased ...
December 2, 2016

Math
using discs (washers), v = ?[0,3^(1/5)] ?(R^2-r^2) dx where R=3 and r=y=x^5 v = ?[0,3^(1/5)] ?(9-x^10) dx = 90?/11 3^(1/5) using shells, v = ?[0,3)] 2?rh dy where r=y and h=x=y^(1/5) v = ?[0,3)] 2?y^(6/5) dy = 90?/11 3^(1/5) You might have showed your work, right?
December 2, 2016

Pre-Calculus
tan?/sec? = tan?*cos? = sin? rsin? = 2 y = 2
December 2, 2016

Calculus
tan? = 4 ? = arctan(4) (C)
December 2, 2016

Calculus
plug and chug: 2xy = 3 2 rcos? rsin? = 3 so, (C)
December 2, 2016

Pre-Calculus
r = 4sec? r = 4/cos? rcos? = 4 x = 4
December 2, 2016

Pre-Calculus
recall that tan? = y/x so, your equation is just y/x = -?3 y = -?3 x
December 2, 2016

Calculus
your turn to show some work
December 2, 2016

Calculus
Since the region is rotated around x = -3, you should have ?((3+?(9-y^2))^2-9)
December 2, 2016

Calculus - Integrals
The curves intersect at (0,0) and (2?2,2?4) using discs, v = ?[0,2?2] ?(R^2-r^2) dx where R=?(4x) and r=x^2/2 v = ?[0,2?2] ?(4x-x^4/4) dx = 24??4/5 using shells, v = ?[0,2?4] 2?rh dy where r=y h=(y^2/4)-?(2y) v = ?[0,2?4] 2?y(?(2y)-(y^2/4)) dy = 24??4/5
December 2, 2016

algebra
actually, it's h(t) = 200 - 16t^2 so, use 11 for t and evaluate it.
December 2, 2016

Calculus
let f(x) = 4sinx, g(x) = 2cosx. the graphs cross at u=arctan(1/2), so the area is ?[0,u] (g-f) dx + ?[u,.7?] (f-g) dx
December 2, 2016

math
Since x>7, you want any number greater than 7. How hard is that? Only one choice fits.
December 2, 2016

Calculus
what's the trouble? The height of each small rectangle is just the distance between the curves, so a = ?[0,1] (2x^2-x^4) - (x^8) dx
December 2, 2016

algebra
look at the values for n n #people 0 4 1 4*3 2 (4*3)*3 = 4*3^2 ... n 4*3^n why do you repeat all the math? It's very distracting and annoying.
December 2, 2016

Maths
x-6 = (50-x)+12
December 2, 2016

Math
ab/2 = 12 a+b = 16
December 2, 2016

Math
already did! http://www.jiskha.com/display.cgi?id=1480652609
December 2, 2016

math
so, how many turns required for 1000m? 1000m * 1turn/2.2137m = ? turn
December 2, 2016

Algebra 1B
But it is not. Try again. It is A.
December 2, 2016

Algebra 1B
just solve for x when y=0. be careful, as A and D are almost the same
December 2, 2016

math
Drop an altitude from B to D on AC. Then triangles ABD and CBD are 30-60-90 right triangles. AD = DC = 3?3 so, AC = 6?3 a+b = 9
December 2, 2016

Math
well, the room is 4x3 tiles
December 2, 2016

Math
All are ok except #7 ?? and your answer formatting still sucks.
December 2, 2016

Check them please MAth
I don't see any of your answers to check. And your text formatting is totally bogus, D00d!
December 2, 2016

maths
Well 100% = 5/5 so, how many fifths are left?
December 2, 2016

Math
R*I = I ? is irrational I+I = I (usually) R^3 = R so ok there
December 2, 2016

Algebra
do you know the golden ratio?
December 2, 2016

algebra 2a solving systems using matrices
Nope. The matrix has no x in row 1.
December 2, 2016

Math
cos(180-x) = -cos(x) cos(90-x) = sin(x) so you have (0.5)cos^2(x)sin^2(x) = 0.05 cos^2(x) sin^2(x) = 1/10 sin^2(2x) = 1/40 sin(2x) = ±1/(2?10) ...
December 1, 2016

Pre-calc
one revolution covers 26? inches. Now let's start the conversion. 70mi/hr * 1hr/60min * 5280ft/mi * 12in/ft * 2?rad/26?in = 5686 rad/min
December 1, 2016

Math
200*20^2 = 200*400 = 80,000 if the answer is -8000 then there has been some mangling. It seems clear that something is wrong, since ()^2 is always positive.
December 1, 2016

math
Draw a diagram. The angle ? subtending the visible part of the earth is such that cos(?/2) = 1/3 see what you can do with that.
December 1, 2016

Algebra
visit here for all the details: http://www.mathportal.org/calculators/polynomials-solvers/synthetic-division-calculator.php
December 1, 2016

Algebra
try here: http://calc101.com/webMathematica/long-divide.jsp
December 1, 2016

deferential calculus
where is the wall? at the circumference of the courtyard?
December 1, 2016

math
standard form is just 9.26
December 1, 2016

math
9 + .2 + .06 = ...
December 1, 2016

Math
the quotient of x + 2 is incomplete. You need the quotient of ... and ... since division needs a divisor and a dividend.
December 1, 2016

Math
the areas are in the ratio 3^3:5^2 = 9:25 = 108:300
December 1, 2016

math
If it takes x hours, then 1/2 + 1/3 = 1/x
December 1, 2016

math seventh grade
well 550 = 5.5 * 100 so, it will take 100 minutes.
December 1, 2016

Math
sure, as long as you provide some work on your part. We don't like homework dumps here.
December 1, 2016

Math
7*18 + 4*14 + 26
December 1, 2016

math
3x-14 = 8 I suspect a typo. Is it reasonable for a kid to be almost 3 times as old as his grandfather?
December 1, 2016

Math
30/2.5 = 12
December 1, 2016

Algebra
4(6+x) = 6+x
December 1, 2016

Algebra
To fill the whole tank in x hours, 1/5 - 1/7 = 1/x but you only have to fill 1/3, so adjust accordingly.
December 1, 2016

steve plz help me on my math
just the reverse. The distributive property states that a(b+c) = ab + ac combining stuff inside the parentheses first does not involve the property.
December 1, 2016

math
huh. They gave you the formula, as well as the numbers. Just evaluate 1000 e^(-.028*50)
December 1, 2016

algebra 2
a=10 d=15 S6 = 6/2 (2a+5d)
December 1, 2016

maths
98*3 + x = 100*4
December 1, 2016

math algebra
just find t where 70*0.62^t = 10 .62^t = 1/7 t log.62 = log 1/7 t = log(1/7)/log(.62) = 4.07
December 1, 2016

Math adding fractions with distributive property
same as with any other distributive property problem: with: 6(1/2+2/3+3/4) 6(1/2) + 6(2/3) + 6(3/4) 3 + 4 + 4 1/2 11 1/2 without: 6(1/2+2/3+3/4) 6(6/12 + 8/12 + 9/12) 6(21/12) 21/2 11 1/2
December 1, 2016

math
If c is the hypotenuse, then a^2 + b^2 = 20 a^2+1=20 a = ?19 If not, then a^2 = b^2+c^2 = 1+20 = 21 a = ?21
December 1, 2016

maths
google alternating harmonic series = log(2) for many proofs and discussions, on different levels of math skills.
December 1, 2016

Math
for a square of side s, the diagonal is s?2 So, you have s?2 = 10 ...
December 1, 2016

Are All Right? Math
all are correct.
December 1, 2016

MATH
The area is a circle plus a cylinder, which can be thought of as a rectangle which has been rolled up.
December 1, 2016

Health
Sometimes a patient needs additional care that his or her regular physician cannot provide. In this instance, the physician can make a referral for a patient to see another physician. What are the three types of referrals? (1 point) regular, urgent, fast normal, fast, STAT ...
December 1, 2016

maths plz help
Whatever you copied and pasted from mangled the special characters. Try spelling out special stuff, such as sqrt() etc.
December 1, 2016

Math integer
-2(3 + -4 + -8 + 7) -2(-1 + -8 + 7) -2(-9 + 7) -2(-2) 4 -2(3 + -4 + -8 + 7) -2(3) + -2(-4) + -2(-8) + -2(7) -6 + 8 + 16 - 14 4 34 = -2(-17) so I'd be interested in how you got -17 from what's inside the parentheses.
December 1, 2016

algebra 1
f(m) = 12 - m/25
December 1, 2016

Math
If the average of the 21 students is x, then 21x + 78 + 93 = 23*75
December 1, 2016

Integral Calculus
since pi/4 = arctan(1) just plug in x=1 into the power series. That gives the actual series.
December 1, 2016

Algebra
1,2 ok 50 is 62.5% of 80
December 1, 2016

Math check my answers
all correct.
December 1, 2016

Algebra
product, not sum better review what that means.
December 1, 2016

Algebra 2
Having n in the index and in the expression is bogus. If you mean n-1 ? (3k-2) k=1 Then that can be split up into ?3k - ?2 Now, ?2 is 2(n-1) ?3k = 3?k You know that n ?k = n(n+1)/2 k=1 So for you example, 3?k = 3(n-1)(n)/2 The final sum is thus 2(n-1) + 3(n-1)(n)/2 If I ...
December 1, 2016

Math
x values change sign. y stays the same try experimenting with this -- it should be quite clear.
December 1, 2016

Calculus
(a) is correct (b) solve for t when h=0 (c) use the above t to get v
December 1, 2016

Gk
sounds like a cheap pair of glasses...
December 1, 2016

Math
524 - 520
December 1, 2016

calculus
g has a critical value where g'=0: x = ±4 max/concave down if g" < 0 g" = (x^2-4x+16)/(x-2)^2 For the tangent line, you have a point (3,4) and a slope (-7), so the line is y-4 = -7(x-3)
December 1, 2016

Math
23 years before Columbus set sail. or, maybe 11 14 16 19 ...
December 1, 2016

Math
You now have expressions for AN and NC Using the law of cosines, AN^2 = CN^2 + 2^2 - 2*CN*2 cos?ACN
December 1, 2016

Math
an angle is in degrees, not feet. Your height h is found via h/80 = tan70°
December 1, 2016

math
surely you can tell which is the greatest odd digit. Just take it from there.
December 1, 2016

Algebra
Fix the typo Then just expand and subtract, knowing that (x-4)^2 = x^2-8x+16
November 30, 2016

Algebra
w(3w-2) = 60 solve for w, then get length
November 30, 2016

Calculus
just find c such that 3c^2 = (65-9)/(4-2)
November 30, 2016

Algebra 1
double the 1st equation and you have 6x + 2y = -22 6x - 2y = -2 Now you can add them to eliminate y, or subtract to eliminate x.
November 30, 2016

Math
g = b+12 b/(b+g) = 35/100 ...
November 30, 2016

calc
since C = 2?r, dC/dt = 2? dr/dt Since dC/dt = ?/4, dr/dt = (?/4)/(2?) = 1/8 cm/min v = ?r^2h dv/dt = 2?rh dr/dt + ?r^2 dh/dt = 2?*4*12*(1/8) + ?*16*(1/2) = 20? cm^3/min
November 30, 2016

Pre-Calculus
r can be anything. So, the equation is just a straight line at that angle. tan? = -?3 y/x = -?3 ...
November 30, 2016

Math
add up the value of all the coins: 5n + 10(n+15) = 255
November 30, 2016

Math -Calculus
you need to do a definite integral. So, what are the limits? The curve intersects the x-axis at x = ±?(3/2) so now all you have to do is evaluate 6x - 4/3 x^3 at those points. Due to symmetry, you can just take twice the value from 0 to ?(3/2) f(?(3/2)) = 6?(3/2) - 4/3...
November 30, 2016

Algebra
If he makes x more cheese sandwiches, then (12+20+4+x) = 5(4+x) x = 4 check: 4+4=8 cheese out of 40 total. You can try other settings as well.
November 30, 2016

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