Thursday
July 31, 2014

Posts by Quidditch


Total # Posts: 494

math
Looks good!

Math
Try multiplying by a/a.

Maths
Don't forget to think about negative numbers here. What negative numbers would give you a correct answer?

algebra
Both answers are correct!

Math
Looks good!

trig
You have the right idea. one revolution is 2(pi) radians. Converting revolutions to radians: R=revolutions Revolutions in Radians=R*2(pi) So, to convert 2.8 revolutions/sec to radians =2.8(2)(pi)/sec

precalculus
With the values given, I did not find any of the answers on the graph. For a distance vs time graph. X axis is time and Y axis is distance. at t=6s, dist=5m at t=8s, dist=6m at t=10s, dist=7m at t=12s, dist=8m I don't see any of those as choices.

precalculus
For problem 2, I got A, x=-1.

precalculus
C is the answer I got.

precalculus
Problem 1. Look at my calculation, the average rate is +12,not a negative number.

precalculus
For a distance vs time graph. X axis is time and Y axis is distance. at t=6s, dist=5m at t=8s, dist=6m at t=10s, dist=7m at t=12s, dist=8m I don't see any of those as choices.

precalculus
Problem 1 A is not the answer. f(4)- f(1) =11 - (-1) = +12 -------------- Problem 3. C looks correct

precalculus
Problem 2. The answer is not B, (x=0).

precalculus
Problem 1. The answer is NOT D. The average rate of change is: for x=1, f(1)=-3 for x=4, f(4)=-3 Average rate of change is 0, not a negative number. One of the answers does give a negative average rate of change.

PreAP Physics
Yes, that's what I got, also.

Help
That's correct!

Math
Let B = the "break even" number of books. Production costs=$76,322 + B * $10 Total Sales = B * $25.50 Setting these equal... Total sales = Production costs or... $76,322 + B * $10 = B * $25.50 Solve for B

MATH 7th GRADE
1, 2, 3, 4, and 6 look OK I don't understand 5, 7 is wrong.

MAT 7th GRADE
number 4 should be +5 6 is wrong.

algebra
slope = rise/run. For a slop of 0.4 0.4 = rise/130 Solve for rise. It looks like you have accidentally moved the decimal in your line: .040=rise

MATh please help
Let D = the number of dimes. So, D + 9 = the number of nickels. Adding... D * 10 + (D + 9) * 5=135 combining 15 * D + 45 = 135 15 * D = 90 Divide both sides by 15 D = 6 There are six dimes. So, the number of nickels is 6 + 9 = 15

physics
The time is takes to slow down is T2 - T1. That is given as 3.0s.

pre-calculus
The best way to check is to substitute your answer back into the equation. SQRT(2x+1)-5=8 SQRT( (2*84)+1)-5=8 SQRT(168+1)-5=8 SQRT(169)-5=8 13 - 5 = 8 8 = 8 You are correct!

Math
Adding the items gives $460 The tax on that at 5.5% =0.055*$460 =? Add the tax to the cost of the items. That value is one of the choices given.

College Math
-5+2*SQR(12) =-5+2*SQR(4*3) =-5+2*SQR(4)*SQR(3) =-5+2*2*SQR(3) =-5+4*SQR(3)

College Math
My Alt+251 keyboard did not post as a square root--reposting...

College Math
You got the right answer! It just needed to be reduced. -5 + 2*ã(12) =-5+2*ã(4*3) =-5+2*ã4 * ã3 =-5+2*2*ã3 =-5+4*ã3

Physics for Engineers
Check part b comments on your previous post.

Physics
Using that... Y=14.47m/s(2.2s)-(1/2)(9.8m/s)(2.2)^2 Y=31.834m - 23.716m =8.118m So it clears the wall by 8.118m - 6.7m =1.418m

Physics
I get 14.47m/s for Vy.

Physics
I calculated the ball was thrown at a speed of 18.12m/s. Vx is 24m/2.2s=10.91m/s Vx=V(cos(53)) That gives V as 18.12m/s

Physics
Sorry, I see that was given.

Physics
On part b, You need to find how long it takes the ball to go th 24.0m in the x direction. Use that time for the y calculation.

algebra 2
I believe Capreeca is wrong on this one. 2x+1=3 2x=2 x=1

maths
Please note that "ina"'s answer is wrong.

Algebra
Change the 31% to a decimal value. Then multiply both sides of the equation by Q. Then get all the Q terms on one side and the number terms on the other side. Combine the terms and solve for Q.

Geometry
I think you made an error in adding the angles. In your problem angles are x, 3x, and 4x. Adding those gives 8x not 7x. Does that help?

Algebra 1
let J=Jim's age let D=Dave's age It is given that Dave can vote. So D>=18 Dave is 5 years older J+5=D or J=D-5 Jim can't vote. J<18 Substitute for Jim's age: D-5<18 Solve this for the upper limit for Dave's age.

algebra 1
Sorry the next to last line should say to express LENGTH as a function of W. Then, solve for W.

algebra 1
What does the problem say: Perimeter is less than 48ft. Let P=perimeter Let L=length Let W=width P<48ft Express perimeter in terms of length and width: P=L+W+L+W or L+W+L+W<48ft Express the width as a funtion of L. Substitute that value into the above equation and solve ...

physics
Yes, that is correct. I would really encourage you to carry the units through from start to finish. It seems like extra work, but it can help detect errors.

math
Yes, you are correct!

math
type LCM, least common multiple

math
I think 72 is the LCM, least common multile, not GCF, greatest common factor.

Algebra
Add 4 to both sides. Then, square both sides. Does that help?

Pre-algebra
To clarify: (-4)^4 is not equal to -256.

Pre-algebra
-256 is not the correct answer.

math
Yes! All answers are correct. Note that answer 4 could be reduced to 19/30 hours.

math
BUBBA's answers start with a wrong answer.

Algebra 2
Correcting typo The line 5 = H = 1 shoud read: 5 = H - 1

Algebra 2
My error I just reread that the first 1/2 hour is included. I am quite sure that the it is $30 for each additional 1/2 hour the equation is: Let H = the number of HALF HOURS $200 = $50 + (H-1))$30 similarly $150 = (H-1)*$30 5 = H=1 adding 1 to each side: H= 6 This is the numbe...

Algebra 2
I think there is some confusion here. Let H = the total hours $200 = $50 + (H-1)*$30 Remember that the first hour is included in the $50. subtract $50 from both sides $150 = (H-1)*$30 divide both sides by $30 5 = H -1 add 1 to both sides: H = ??

Algebra B
You are very welcome.

Algebra B
You're welcome, but I am not sure what you mean by reverse FOIL. First terms: x and x Outer terms: x and -5/4 Inner terms: -5/4 and x Last terms : -5/4 and -5/4 I just want to be sure you have a good understanding about the order.

Algebra B
OK, (x-5/4)^2 = (x-5/4)(x-5/4) multiplying (remember FOIL--first, outer, inner, last) = x^2 -(5/4)(x) - (5/4)(x) + (5/4)^2 = x^2 - (10/4)(x) + (5^2)/(4^2) = x^2 -(5/2)(x) + (25)/(16) Does that help?

Algebra B
Which side (left or right) is puzzling?

Physics
Be careful of units. You expressed the runway length in m (meters), but the takeoff speed is expressed in mi/h (miles/hour). You will need to do some units conversion.

computer architecture
Modern PCs have a word size of 32 or 64 bits. Early IBM PCs used an Intel 8088 which had an 8 bit data path.

ALGEBRA/AM I CORRECT?
my misspelling... You have AN eror.

ALGEBRA/AM I CORRECT?
You have and error. 3X + 240 + 36X = 6 39X = -234 X = ?

Physics
You are very welcome!

Physics
Since the moments were calculated from the end the fisherman is holding in his left hand, that force does not generate any moment.

Physics
Assuming the fishing pole is horizontal... Yes, the fisherman's left hand is exerting a downward force. You are correct.

ALGEBRA
You're welcome. Glad to help

ALGEBRA
6 is correct. However, your last step is not quite correct. starting with... 20x + 10 - 10 = 130 - 10 20x = 120 Now divide both sides by 20, not 20x 20x/20 = 120/20 x = 6

math
Yes, that answer is correct.

Physics
You are headed in the right direction. That is a distance formula when there is uniform acceleration which is gravity in this problem. The formula is: s2 = s1 + vt + (1/2)(a)t^2 where: s2 = final distance s1 = initial distance v = initial velocity a = acceleration t = total ti...

Physics
How are you solving it? What answer are you getting?

Algebra
Your welcome! Glad to help

Algebra
Yes, you got it!

Algebra
Close... You have the inequality correct, but when you divided both sides by -4, you you have an error on the right side. 6/(-4) = ?

Algebra
-4x + 1 >= 7 Solve this as you would if there was just an "=" sign. But, anytime you multiply or divide both sides by a negative number the inequality sign will reverse. To get you started... Subtract 1 from both sides.

algebra
1. Make sure the equation is in the form: ax^2 + bx + c = 0, which your problem is. 2. Use the quadratic formula: x1 = (-b + (b^2 - 4ac)^(1/2))/(2a) x2 = (-b - (b^2 - 4ac)^(1/2))/(2a) You can check your answers by substituting into the original equation.

algebra1
The problem says the hours will always be over 20. The charge for the first 20 hours is $9.95. All the hours after 20 are $0.50 each. h = total monthly hours cost = $9.95 + (h - 20)x $0.50 Plug in 35 for h and what do you get?

math
Be cautious about units on this problem. The problem gives the distance in feet. Gravitational acceleration in English units is about 32 ft/sec^2 .

calculus
You got it! Glad to help.

calculus
Sorry, my error... I went the wrong way! Your exponent and coefficient are wrong.

calculus
The exponent is correct, but the coefficient is not 1. If you take the derivative of your answer do you get x^4?

math
Retyping last lines... What is 10% of the new larger salary? Subtract that to find what your salary is after the 10% cut.

math
What is 10% of $90,000? Add that to $90,000 to find your salary after the raise. What is %10 of the new larger salary? Substract that to find what your salary is after the %10 cut.

algebra word problem
r-5 being negative results in a negative t2 and so should be ignored.

algebra word problem
You are practically there! Combine terms and rearrange to get into the form: 4r^2 -90r + 275 = 0 Use the quadratic formula to find r. There will be two answers. One of the answers is the result if the canoeist reverses direction (r-5 is negative).

math
Put the equations into slope-intercept form: y = mx + b m = slope b = y intercept For your first problem... subtract x from both sides x + 8y = 16 8y = -x + 16 divide both sides by 8 y = -(1/8)x + 2 So, the slope is -(1/8) I am not sure why you set y to 0 in your solution. Tha...

Math
Put the equation into the form ax^2 + bx + c = 0 then use the quadratic formula to find the solutions.

math
You can put the equations into the form ax^2 + bx + c = 0 then use the quadratic formula to find the solutions.

math
The x intercept occurs where the line intercepts the x axis. The value of y at that point is 0. If you substitute 0 for y in your equation, what does x then equal?

math
The y intercept is where the line intercepts the y axis. So, it occurs when x = 0. Plug the value of 0 into your equation. What do you get?

Math
If you multiply the top row number by 5 and then add 1, you get the bottom row number.

Math
I am not sure why your teacher circled it. When the problem is solved, 8 fits into the sequence top and bottom.

Math
Now for the second part, how does the second row relate to the first. 2, 3, 5, 8, 12 11, 16, 26, 41, ? First I would check what would be added to the top row to get the bottom row. That would be 9, 13, 21, 33. Those don't seem very related. What would be multiply the top r...

Math
Yes! Excellent!

Math
For determining sequences a good start is to look at the difference between adjacent numbers. For the sequence: 2, 3, 5, ?, 12 write the differences. This sequence is not a hard one.

Algebra
t = 3t^3 + 22t^2 + 8t subtract t from both sides 3t^3 + 22t^2 + 7t = 0 t is common to each term t(3t^2 + 22t + 7) = 0 So, t = 0 is one solution. Factor 3t^2 + 22t + 7 to get the other two solutions.

science
You had the right idea when you said "the weight of the book is cancelled out by the support of the table". The force due to gravity is opposed by a force exerted on the book by the table. The NET force on the book is zero. So, the answer is b.

Math
That looks good!

Math
Yes, there is a solution. Start by getting a common denominator.

pre-algebra
It looks like some parenthesis would help clear this up. 2/(x-5) = 1/(x+2) cross multiply... 2*(x+2) = x-5 = 2x + 4 = x - 5 subtract 4 from both sides 2x = x - 9 subtract x from both sides x = -9 check by substituting -9 back into the original equation. 2/(-9 - 5) = 1/(-9 + 2 ...

Math-please check my answer
That's right!

math-please check my answer
No, the slope is not 3. (y2 - y1)/(x2 - x1) point 1: x1 = 3, y1 = 5 point 2: x2 = -5, y2 = -2 So... (-2 - 5)/(-5 - 3) =(-7)/(-8) =7/8

Math
You're welcome.

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