Tuesday

July 7, 2015

July 7, 2015

Total # Posts: 91

**Alegbra**

I think I already explained this to you down below.
*January 2, 2012*

**Calculus**

1/a+1 + 1/a-1 I solved this out by multiplying the (a+1) by (a-1) and multiplying (a-1) with (a+1) To get (a+1)(a-1) as the denominator. Then I did the same with the numerators and got this: 1(a-1) + 1(a+1)/(a+1)(a-1) And I got 2a/(a+1)(a-1) But still sometimes this process ...
*January 2, 2012*

**Radical expressions**

Multiplication of Rational Numbers: 1. Consider the factors of the numerator and of the denominator. 2. If there are factors common to the numerator and the denominator, reduce by dividing out the common factors. 3. Multiply all the numerators together and multiply all the ...
*January 2, 2012*

**Radical expressions**

I'll give you a list steps to follow: 1. Determine the lowest common denominator (LCD) for the rational numbers. 2. Express each rational number as an equivalent rational number with the LCD as the denominator. 3. Combine the rational numbers by adding/subtracting ...
*January 2, 2012*

**Calculus**

Thank you and yeah nonpermissible is another word for restrictions.
*December 31, 2011*

**Calculus**

Thank you so much Damon :)
*December 31, 2011*

**Calculus**

Simplify. State the nonpermissible values. (3t^2+3t-6/2t^2-2t-4)(4t^2+4t-24/3t^2+6t-9) This is the way I tried solving this: 3t(t-1)6(t-1)/2t(t-1)4(t-1)*4t(t-2)12(t-2)/3t(t+1)9(t-1) (3)(t)(t-1)(2)(3)(t-1)/(2)(t)(t-1)(2)(2)(t-1)*(2)(2)(t)(t-2)(2)(2)(3)(t-2)/(3)(t)(t-1)(3)(3)(t-...
*December 31, 2011*

**Calculus--Reiny**

Thanks Damon =)
*December 25, 2011*

**Calculus--Reiny**

Calculus - Reiny, Friday, December 23, 2011 at 6:59pm I read that as (4a^2-1)/(4a^2-16) * (2-a)/(2a-1) , my brackets are necessary = (2a+1)(2a-1)/( 4(a+2)(a-2) * (2-a)/(2a-1) the (2-a)/(a-2) are opposite, they will give you the -1 so.. = -(2a+1)/(4(a+2)) , again you have to ...
*December 25, 2011*

**Calculus**

Thanks Reiny =) But I to get everything clear, the 2-a and the a-2 cancel right? After I cancel those I am left with (2a+1) as the numerator:S Sorry I am just confused. Also did you factor out the 2a+4 and 2a-4 to get 4(a+2)(a-2)? Could you please explain step by step?
*December 23, 2011*

**Calculus**

Thanks so much =)
*December 23, 2011*

**Calculus**

Simplify. State the nonpermissible values. 4a^2-1/4a^2-16*2-a/2a-1 This is what I did to try and solve it out: (2a+1)(2a-1)/(2a+4)(2a-4)*2-a/(2a-1) I cancelled out the (2a-1)'s and don't get how to solve. I'm supposed to get the answer : -2a-1/4(a+2) But I don'...
*December 23, 2011*

**Math**

Determine the perimeter of the rectangle if x = 2*sqrt2cm. In simplest radical form. ^ Don't get how to solve.
*December 10, 2011*

**Math**

Consider the rectangle with an area of 24x^3-54x^2-15x, with a side length of 6x^2-15x. Write and simplify an expression for the length of the rectangle. ^ Could someone please show me how to do this?
*December 10, 2011*

**Math**

Simlifying Rational Expressions Reduce to lowest terms, stating the restrictions on the variable. I really don't understand the whole cancelling out the factor thing, and not cancelling out the terms. As I was having lots of trouble with this stuff this is the way I was ...
*December 10, 2011*

**Math**

The quadratic function f(x) = x^2 is transformed to g(x) = -2/3(x+3)^2 + 6 The point (6,36) on the graph of f is transformed to which point on the graph of g? Could someone please show me how to solve this:\
*December 7, 2011*

**Math**

A photograph measuring 8 inches by 6 inches is surrounded by a mat. The mat has the same width on all sides of the photograph. The photograph and mat are put into a glass photo frame which just covers the outside of the mat. If the area of the glass surface is 120 square ...
*December 7, 2011*

**Math**

y = 0.005x^2-0.801x+46.928 ^ Using that model above, how di I determine the cost per km to the nearest tenth of a cent, at a speed of 70 km/h? I think I use a graphing calculator for this, and since speed is the x value I probably have to insert in 70.
*December 7, 2011*

**Math**

The roots of the equation 4x^2+4x-5 = 0 can be written in the form x = -1+-*SqrtA/2 The value of A is, how exactly do I do this?
*December 7, 2011*

**Math**

The shortest side of a right angled triangle is 7cm less than the second shortest side. The sum of the squares of these two sides is equal to 289cm^2. The perimeter of the triangle in cm is? I dont get how to do this, I think Im meant to use a quadratic equation to solve.
*December 7, 2011*

**Math**

Determine for what value(s) of d the quadratic equation 5x^2-10x+d = 0 has i) real and distinct roots ii)real and equal roots iii)non-real roots This is what I did to solve for A. 5x^2-10x+d = 0 b^2-4ac = 0 (-10)^2-4(5)(d) = 0 100-20d = 0 -20d = -100 d = 5 Need help with others.
*December 5, 2011*

**Math**

The graph of a quadratic function has vertex(3,-4) and passes through the point (4,1). Find the equation of the function in standard form. Rewrite the equation in general form. Could someone explain to me how to do this, just don't understand.
*December 5, 2011*

**Math**

Where does that two in the denominator go? Since it has to cancel out with all terms.
*December 5, 2011*

**Math**

Solve the following quadratic equation(as exact values) using the quadratic formula. x^2-10x-15=0 I got 5+-2sqrt10/2. ^ Sorry hard to write it out. But basically there is a 5 there, the negative sign is supposed to be under the positive sign, then there is a two outside of the...
*December 5, 2011*

**Math**

The graph of a quadratic function has vertex(3,-4) and passes through the point (4,1). Find the equation of the function in standard form. Rewrite the equation in general form. Could someone explain to me how to do this, just don't understand.
*December 5, 2011*

**Math**

Got the answer:)
*December 5, 2011*

**Math**

x^3 + 8x^2 = 20x How do I find the root of ^ that equation? 2x^2-10x+12 = 0 ^ I found that one by... 2(x-3)(x-2) x-3 = 0 x = 3 x-2 = 0 x =2 ^ Is that the correct way to solve for that one
*December 5, 2011*

**Math**

Thanks so much!
*December 5, 2011*

**Math**

f(x) = 5x^2 - 35x I converted ^ that equation to.. 5x^2-35x = 0 How do I go about from here to determine the zeros and the y intercept?
*December 5, 2011*

**Math**

Thanks so much MathMate =)
*December 5, 2011*

**Math**

x^3 + 8x^2 = 20x How do I find the root of ^ that equation? 2x^2-10x+12 = 0 ^ I found that one by... 2(x-3)(x-2) x-3 = 0 x = 3 x-2 = 0 x =2 ^ Is that the correct way to solve for that one?
*December 5, 2011*

**Math**

Thank you so much bobpursley, I was so confused on how to do this, you are a lifesaver!
*December 5, 2011*

**Math**

2x(x+3) = 0 Is there a way to solve that using the below methods? Substitute zero for f(x) and find the roots of the resulting equation, or graph the function and determine the x-intercepts of the graph. Finding the roots of a single variable equation may involve factoring. ...
*December 5, 2011*

**Math**

Analyzing Quadratic Functions describe how the graphs of the following functions relate to the graph of y=x^2. Could someone please tell me what that means? I sort of understand it, but I want to get it perfectly straight. y = (x+5)^2 Since it's in the brackets, that would...
*November 24, 2011*

**Math**

Find the Zeros of the following functions f(x) = x/3 +5 ^ That one is layed out so differently I don't understand how to solve. In each of the following, determine the zeros of the function and determine the y-intercept of the graph of the function. f(x) = 5x^2 - 35x f(x...
*November 24, 2011*

**Math**

Learning about quadratic functions and equations, and I am struggling. It's so easy for others to understand, but math is my weakness, would appreciate all the help you could give. Notes and stuff would be great, as long as I understand. Quadratic Functions and Equations, ...
*November 24, 2011*

**Factoring Trinomials**

Nevermind, I think I got it. Thanks for showing me the Quadratic way.
*October 31, 2011*

**Factoring Trinomials**

For the criss cross method, Im supposed to find two numbers that multiply to get 4x^2. And those were 2x and 2x. Then, Im supposed to find two numbers that multiply to give me 15, which was either 15 and 1 or 3 and 5. I used both, by criss crossing 2x to 3 and 2x to 5. That ...
*October 31, 2011*

**Factoring Trinomials**

How did you get that using the criss cross method?
*October 31, 2011*

**Factoring Trinomials**

Working on how to factor trinomials, and the method that works best for me is the criss cross method, so Ive sticked with it. But Ive been stuck on one question for the past few minutes, and don't know what I've been doing wrong. 4x^2+23x+15 2x and 2x times to make a ...
*October 31, 2011*

**Calculus**

In triangle PQR, angle P is 20 degres, angle R is 150 degrees, and QR is 6, the length of PQ is...?
*October 24, 2011*

**Calculus**

Sorry, I just really suck at trigonmetry, and Im in grade 11.
*October 24, 2011*

**Calculus**

P (-V3/2, -1/2 and Q(1/2, V3/2 are two points on the unit circle. If an object rotates counterclockwise from point P to point Q, what angle has it rotated? 180 + 60 = 330 P 60 Q I got like 300, but its supposed to be 210 degrees:\
*October 24, 2011*

**Calculus**

Find the exact values of the following. cos 270 degrees = 90 degrees, value = 0. Sin 180 degrees = 180-90 = 90 = 1, but its supposed to be zero, dont know how to get that:\ Confused with tan 240 degrees as well.
*October 24, 2011*

**Calculus**

Determine the measure of A if 0 degrees is less or equal to angle A and if angle A is less or equal to 360 degrees. Tan A = 0 Answer is somehow supposed to be 0 degrees, 180 degrees, and 360 degrees, but dont know how to get the answer, just really confused. Sin A = -1
*October 24, 2011*

**Calculus**

Fine the measure of feta, to nearest degree, where 0 degrees is less or equal to feta, and feta is less or equal to 360 degrees. tan feta + 5 = 0, I tried working this out and I got -78.6:\
*October 24, 2011*

**Calculus**

The point A(-3, -5) is one the terminal arm of an angle feta. Determine the exact expressions for the primary trigonmetric ratios for the angle. Would that be 225 degrees. -2V2?
*October 24, 2011*

**Calculus**

Thank you, so would I use those expressions to find the area? Would I times 8sin60 by 8 cos60?
*October 24, 2011*

**Calculus**

A rectangle has a diagonal of 8cm. The diagonal creates a 60 degrees angle at the base of the rectangle. Write an exact expression for the base and the height of the rectangle. ^^ Dont get how to do that, Ive only drawn a triangular diagram, and im confused about the ...
*October 24, 2011*

**Calculus**

Determine two angels between 0 degrees and 360 degrees that have a sine ratio of -1/2. Would that be 30 and 330?
*October 24, 2011*

**Chemistry**

Ionic bonds and covalent bonds: Ionic Bond(s) for: K&S -> K2S N&Be -> Be3N2 Al&P -> AlP Covalent Bond(s) for: C&F -> CF4 S&O -> OS Cl&Se -> SeCl4
*October 13, 2011*

**Calculus**

Find the measure of feta, to the nearest degree where o degrees is less than feta which is less than 360 degrees. 6 sin feta = -1 I really dont get how to solve, I hate algebra, and I feel that it's gonna be getting used in this question.
*October 12, 2011*

**Velocity and Displacement**

A stone falls freely from rest for 8.0s. A. Calculate the stone's velocity after 8.0s. V2-V1+at V2 = (0) = 9.8(8.0) V2 = 78.4m/s B. What is the stone's displacement during this time? d = (v2 + v1)t/2 d = (78.4 + 0)/2(8.0) d = 313.6m
*October 9, 2011*

**Calculating Distance**

If you drop a golf ball, how far does it fall in 0.5s? Is the correct formula to use?: D = V1 + t + 1/2at^2. But the problem is that I dont know the acceleration, would that be 0?
*October 9, 2011*

**Finding Velocity**

A brick falls freely from a high scaffold. A. What is its velocity after 4.0s? B. How far does the brick fall during the first 4.0s? I don't know what formula to use. I only have time, and I guess the first velocity would be 0s.
*October 9, 2011*

**Physics**

A car is travelling on a highway Can it have a negative velocity & a positive acceleration at the same time? Can the car change d direction of its velocity when travelling with constant acceleration?
*October 6, 2011*

**English**

You only have to capitalize it if you're starting a sentence with that word, otherwise it stays lowercase.
*October 5, 2011*

**Velocity and Acceleration**

A car is travelling on a highway Can it have a negative velocity & a positive acceleration at the same time? Can the car change d direction of its velocity when travelling with constant acceleration?
*October 5, 2011*

**Calculus**

2^3V4(2^3V54-^3Vx) is equal to 16, then x is equal to... I simplified the 2^3V4 and got 64, and just got stuck.
*October 5, 2011*

**Calculus**

5-3ã2 multiplied by its conjugate is... Its supposed to be 7, but I dont get how to do this, cause now im totally confused, i thought that the conjugate came when you were to rationalize a denominator... I did this... 15ã2-9ã4 15&...
*October 4, 2011*

**Calculus--Reiny**

Im also doing this problem wrong... 2^3V4(2^3V54-^3Vx) is equal to 16, then x is equal to... I simplified the 2^3V4 and got 64, and just got stuck.
*October 4, 2011*

**Calculus**

A square is inscribed in a circle. If the area of the circle is 144(pi)cm*squared* --sorry the square root thing isnt showing up. Then the exact perimeter of the square is... I really dont get how to solve this, but the answer is supposed to somehow be 48V2 cm
*October 4, 2011*

**Calculus STUCK**

Ok, so I missed out the 4, and ended up writing 7V2. That missing out the 4 messed up everything, and yup you are right, thanks a bunch =D
*October 4, 2011*

**Calculus STUCK**

Dont know if the radicals will show up.. 2ã3(ã243-2)-ã2(5+7ã2) Can be expanded and simplified to the form p + qã2 + rã3. the value of p + q + r is_____ First I simplified the V243 and I got 9V3 2V3(...
*October 4, 2011*

**To Reiny**

Oh Ok, so yeah the book is wrong, I checked again, and yeah that negative sign is an error in the book. That would have totally messed me up.
*October 4, 2011*

**To Reiny**

Thanks, so that - does not matter, cause Im supposed to add all of them, and the answer I got was 37 which is the exact same answer in my textbook.
*October 4, 2011*

**To Reiny**

Reiny could you please check my Calculus post below, it says Calculus--Reiny.
*October 4, 2011*

**Calculus**

But all a,b,c and d are supposed to be positive integers, and I looked over this again, and its supposed to simplify into aVb-cVd, so that means that the negative sign is supposed to be there, but the integer C is not negative.
*October 4, 2011*

**Calculus--Reiny**

V = Radical The expression: V2(V5-12V3)-V3(V8-2V30) can be written in simplest form aVb-cVd, where a, b, c ,d are all positive integers. The value of a + b + c + d is ________. So after solving all this out, I arrived at 7V10 - 14V6. That - is beside the 14, and Im only ...
*October 4, 2011*

**Calculus**

About rationalizing denominator, is it true that you can't always multiply by the same square root denominator to get a perfect square?
*October 3, 2011*

**Calculus-Rationalizing Denominator**

I am very confused on how to rationalize a denominator, it just gets harder and harder.*will be using the V symbol again as a square root symbol.* I get how to rationalize something simple as V2/V7, I would get V14/7 as the answer, but I get confused on how to solve 1/V6 +2, ...
*October 3, 2011*

**Calculus - - Dividing Radicals**

For the radical symbol, I'll just make a v. 3V240/V108 V240 = 4V15 V108 = 6V3 4V15/6V3 = ??? I am able to divide 3 into 15, and I get 5. But I cant do the same with 4 and 6 because they don't go into eachother evenly, and I can't reduce them either, otherwise that ...
*September 29, 2011*

**Chemistry**

Oh thank you:) That makes sense.
*September 29, 2011*

**Chemistry**

What do you mean by matched sets?
*September 29, 2011*

**Chemistry**

A student forgot to measure the mass of an empty 100mL beaker before adding about 2g of a chemical to it, and decided to simply obtain the mass of another empty 100mL beaker instead. Would this be a satisfactory alternative?
*September 29, 2011*

**Chemistry--Pretty simple question**

Thanks
*September 29, 2011*

**Chemistry--Pretty simple question**

You dissolved a solute in some water to make a solution. If you had needed to know how much solute dissolved, how could you have determined this? I was just guessing of using a scale, but there must be some other way.
*September 29, 2011*

**Calculus - If you can**

If its possible, could you please do this on paint or something for me, and upload it so I can see how exactly you solved this, because explaining over Jiskha, will probably be hard for me to understand as I will not be able to visualize certain steps.
*September 28, 2011*

**Calculus**

ã6(2ã6 - ã5) How do you get 12-ã30? I keep getting a way different answer:\ Btw not sure if the radicals will show up.
*September 28, 2011*

**Calculus-Sorry**

Ok sorry I just cant make that radical sign for some reason but that ã is supposed to be a radical sign.
*September 27, 2011*

**Calculus**

ã27 + ã12 - ã32 - ã8 ã27 = ã3*3*3 = 3ã3 ã12 = ã2*2*3 = 2ã3 ã32 = ã2*2*2*2*2 = 4ã2 ã8 = &...
*September 27, 2011*

**Calculus--Pythagorean Theorem**

Use the Pythaogorean Theorem to determine the exact length of AB. Express the answer as A) an exact value in simplest mixed radical form B) A decimal to the nearest hundredth The picture is right here, I uploaded it of the diagram. h t t p : //imageshack . us/photo/my-images/...
*September 25, 2011*

**Calculus--sorry**

Sorry this ã was supposed to be the radical sign, dont know why it never showed up.
*September 24, 2011*

**Calculus**

State whether the following are true or false. The square roots of 36 are + and - 6. I wrote down false for this cause I thought it was only + 6, but the real answer is true, and I want to know that how can it be negative? Also for this: Convert the following radicals to mixed...
*September 24, 2011*

**Vectors, please check drawing**

Or would it be East of North???
*September 22, 2011*

**Vectors, please check drawing**

Could you check to see if Ive done this right? h t t p : // imageshack . us/photo/my-images/269/vectoriz . j p g /
*September 22, 2011*

**VECTORS**

I already drew a vector diagram for 50m [E] + 32m [W] The way I drew it: 5cm going East, then starting from the end point, 3.2 cm going west. But now it says determine the resultant of the vector. How do I determine that?
*September 22, 2011*

**Physics - Vectors**

A jet travels from Vancouver to Calgary for 1000 km, then turns [N] and travels another 200km toward Edmonton. Draw a scale diagram. Find the displacement of the jet from Vancouver. I just dont get how to draw this out.
*September 22, 2011*

**Calculus**

Nevermind I got it.
*September 21, 2011*

**Calculus**

A government bond is bought for $5000 on June 1, 2010. The value of the bond increases each year by 3.9% of the previous year's value, and the bond matures on June 1, 2030. Determine the value of the bond at maturity
*September 21, 2011*

**Calculus**

I keep getting confused on this stuff. Alan invests $2500 in a 5 year Government bond paying interest at 3.7% per annum compounded annually. Calculate the value of the bond at maturity (after 5 yrs) Tn = 2500(0.037)^5-1 = 2500(0.037)^4 = 2500(1.8741*10^-6) I know the third ...
*September 21, 2011*

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