Number of results: 71,939

**Pre-Cal(Please check)**

sqrt2 /10 Do I just leave this as sqrt2/10 or can I reduce it to sqrt1/5?

*March 11, 2010 by Abbey*

**Pre-Cal(Please check!!!)**

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

*March 23, 2010 by Abbey*

**Pre Cal Check**

focus: (0,p) vertex: if not given, then it is assumed (0,0) Directrix: k+p or k-p, i'm not sure I think these are the general equations for the focus, vertex, and directrix of a parabola, but i'm not sure. could someone please check this? thanks.

*February 25, 2007 by Marie*

**Pre-Cal(Please check)**

1)f(x) = -x + sqrt 4 - x^2 Find f(-2) -(-2) + sqrt 4 - (-2)^2 = 2 + sqrt 4 + 4 2 + sqrt 8 = 4.828 Is this correct?

*March 16, 2010 by Hannah*

**pre cal**

does anyone take pre-cal online ?

*April 16, 2012 by Mecie*

**Science -- Check my Answer Plz**

How much heat (calories) must be applied to a 100 mL beaker filled with boiling water in order to vaporize the water? ** A) 540 cal ** B) 540 * 10^4 cal C) 800 cal D) 8000 cal Is A correct? or cud it be B.?

*January 4, 2016 by Saisir le Jour*

**Pre-Cal(please check)**

I have to find the width of a river which is represented by a right trianle. The opposite side is labeled w and the adjacent side is 1oo ft. Theta is 54 degrees. Would my equation be opp = adjacent/cos(54)?

*March 23, 2010 by Hannah*

**pre cal**

solve for x: x^(2/3)=(1/27) (2^(x)+4)/(2^x)=2 explain please

*December 7, 2008 by jason*

**Pre-Cal**

What is the domain of f/g? f(x) = x / x+1 g(x) = x^3 Please explain! Thank you

*March 22, 2010 by Hannah*

**Pre-cal**

f(x)= x+1 and g(x)= square root of x-3 please help me!

*December 13, 2012 by Isis*

**Science**

A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

*September 26, 2011 by Anonymous*

**physics**

A 50 gram ice cube is cooled to -10oC in the freezer. How many calories of heat are required to heat it until it becomes liquid water at 20oC? (The specific heat of ice is 0.5 cal/goC.) Answer A) 1250 cal. B) 4000 cal. C) 5000 cal. D) 5250 cal. Can someone please help me solve...

*September 26, 2011 by Allison*

**pre cal**

please help don't understand this...Assume f(x) = 2x + 8 and g(x) = 5. What is the value of (f + g)(3)?

*September 27, 2011 by random person*

**Pre-Cal(Please help)**

h(x) = 1/x-3 + 1 I know the vertical and horizontal asymptotes but I just need to know the domain. Please help. I am very confused.

*March 29, 2010 by Hannah*

**Integrated Physics and Chemistry**

The specific heat capacity of copper is 0.09 cal/g°C. How much energy is needed to flow into a 10-gram sample to change its temperature from 20°C to 21°C? A)0.009 cal B)0.09 cal C)0.9 cal D)9 cal

*April 21, 2011 by Ashley!!*

**pre cal--check**

Name all the values of x that are not in the domain of f(x) = (2–x^2)/ (x+ 5) I got only x= -5 because that's the only value that would make the denominator zero.

*March 31, 2009 by Jason*

**Pre-Cal (Please help)**

Identify any asymptotes of the graph. y = 1.08^5x I know that there is a horizontal asymptote but I do not know how to find it.

*March 22, 2010 by Mark*

**Math applied/pre-cal**

(-8/5)^7/4*(-8/5)^1/4=64/25 Not sure how get this answer . Could please show me the steps.

*July 11, 2012 by Hannah*

**math**

80 cal/g x 5 g 400g/cal or 400 cal/g not sure can any one help Neither. 80 cal/g x 5g = 400 cal. The unit g cancels to leave calories. x2+2x-15

*December 11, 2006 by rena*

**pre-cal**

can anyone please explain to me how to simplify this exponential expression??I got no idea...THANKS A LOT! [(-8x^6)/(y^-6)]^2/3

*February 5, 2008 by Kelly*

**pre-cal-please help**

find the mid point of the line segment joining the points P1 and P2. P1 = (3,5) P2 = (-4,7)

*October 13, 2012 by ladybug*

**Pre-Cal**

Sin^2xcosx+4sinxcosx+3cosx=0 I'm not even sure where to start. Help please

*January 28, 2016 by Yolanda*

**Pre-Cal (Help Please!!!!)**

[Note: i need help really badly. I only have 2 hours left] Find all solutions of the following equations. Be sure to check for extraneous solutions. show work 1). 3cosθtan^(2)θ-cosθ=0 2). tan (3θ)+1=0

*July 12, 2016 by Amber*

**Pre-Cal**

Perform the operation and write the result in standard form. (2-3i)(5i) over 2+3i Please help!! I do not understand this.

*March 25, 2009 by Kim*

**pre-Cal(Please help)**

Use the law of cosines to find the angle Q between the given vectors. v = 3i + j w = 2i - j

*March 31, 2010 by Hannah*

**pre-cal**

Find the terminal point determined by t.Please enter answer in ordered pair

*June 5, 2011 by mookie*

**pre-cal/trig**

PlEASE help me with this!! I need it as soon as possible....... cos(x-(pi/4))+sin(x-(pi/4))=1 Find the answer from 0 to 2pi. When I slove this, I got cosx+sinx=(1/ square root of 2). then I don't know what to do the rest. Please help me.

*March 4, 2008 by aa*

**Pre-Algebra(please check)**

Please check these simplified expressions(my answer is after the ;) 4(2k-6)-8(3-3k); -16k-(-48) 9+(-2k)+(-4)-6k; -8k+5 -x+4x-(-8x)-9+2x+1; 13x+(-8) 5(-3x+6)+8x; -7x+30 8+6x+4-8x; -2x+12 5(-m-3)+4m-10; -9m+5

*May 18, 2008 by Jillian*

**pre cal**

Find f of g of h and state the exact domain. f(x) = sqrt x g(x)= e^x - 13e^x/2 + 42 h(x) = 2x I need help on this one bad! Please help!

*October 5, 2011 by Anonymous*

**Pre-Cal(Please help)**

1)(1-cos^2x)(csc x) ? Is this equal to sec x? 2) Expand: log7 3 sqrt x / x^2y 3) Find and simplify: f(g) F(x) = x^2 + 2x g(x) = 2x x^2 + 2x(2x) = x^2 + 4x Is this correct?

*March 15, 2010 by Hannah*

**Pre Cal**

Let me try again, because I keep getting something different. This is the problem: ( (2x^-4y-1)(2y^4z^-1) )^-2/2yx^3z^0 Can you please help me simply this. I didn't get what you got. Thanks.

*September 7, 2015 by bob*

**Chemistry/Physics**

How much heat is required to raise the temperature of 100 g of lead 20 degrees C? The specific heat of lead is 0.0305 cal/g K. A) 51 cal B) 61 cal C) 71 cal D) 81 cal

*July 13, 2015 by Domino*

**Pre-cal (Please Check)**

1) Evaluate (if possible) the sine, cosine, and tangent of the angles without a calculator. a) 10pi/3 Sin = -sqrt 3/2 Cos = -1/2 Tan = sqrt 3 Are these correct ? I do not understand when to make them negative. b) 17pi/3 Sin = -sqrt 3/2 Cos = 1/2 Tan = - sqrt 3 Are these correct?

*February 10, 2010 by Hannah*

**Pre-Calculus**

I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

*September 17, 2011 by Cristina*

**Pre-Calculus**

I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

*September 17, 2011 by Cristina*

**Pre-Cal(Please help)**

Find two functions f and g such that (f X g)(x) = h(x). (There are many correct answers.) h(x) = 4 / (5x + 2)^2 = My answers were: f(x) = 4 / 5x, and g(x) = 5x + 2 Please explain. These answers were wrong and I do not know how to fix them!!

*March 25, 2010 by Hannah*

**Physics**

A 150 gram golden (specific heat 0.03 cal/gram^0 C) spoon at 20^0C is placed in a cup of tea at 100^0C. The amount of heat which the spoon absorbs from the tea which is necessary to reach spoon's tempature 47^0C is a)360.4 Cal b)121.5 Cal c)78.24 Cal d)15.08 Cal e)157.5 Cal

*March 5, 2015 by Vashti*

**Pre-Cal(Please check)**

1) Find all the solutions of the equation in the interval (0,2pi). sin 2x = -sqrt3/2 I know that the angles are 4pi/3 and 5pi/3 and then since it is sin I add 2npi to them. 2x = 4pi/6 + 2npi 2x = 5pi/3 + 2npi Now I know that I have to divide by 2 but that is where I an not ...

*February 18, 2010 by Hannah*

**Pre-Cal(Please check)**

1) Find all the solutions of the equation in the interval (0,2pi). sin 2x = -sqrt3/2 I know that the angles are 4pi/3 and 5pi/3 and then since it is sin I add 2npi to them. 2x = 4pi/6 + 2npi 2x = 5pi/3 + 2npi Now I know that I have to divide by 2 but that is where I an not ...

*February 18, 2010 by Hannah*

**Pre-Cal(Please help!!)**

Consider the function y=arcsin x. a) Use a grapging utility to complete the table. x = -1 -0.8 -0.6 -0.4 -0.2 y = ? ? ? ? ? I am not sure what to plug into the calculator to get the answer.

*February 15, 2010 by Hannah*

**Pre-Cal(Please help)**

Approximate the equation's soultions in the interval (o, 2pi). If possible find the exact solutions. sin 2x sinx = cosx I do not know where to start.

*March 6, 2010 by Abby*

**Pre-Cal**

What is the domain, range, zeros, symmetry, and is it even/odd of these functions? (how can you tell, i don't remember how you get all these, refresher please) y= 1/x y=[x] y=sq rt. of x^2 -4 y=sin x y=cos x y=tan x

*August 23, 2010 by Amanda*

**Pre Cal**

what does it mean when it says describe the end behavior of f and whats that for f(x)=(x^2+x+3)/(x-1) and f(x)= 3*2^x, please explain everything, and if you use --> tell me what that means, cuz i have no clue

*July 25, 2011 by Ashley*

**Pre-Cal(Please help)**

Determine the domains of (a)f and (b) f X g f(x) = 1/x g(x)= x + 3 For the domain of f I had x > 0 and for f X g I had all real numbers but this was wrong.

*March 25, 2010 by Hannah*

**Pre CAL!! Please HELP**

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

*November 4, 2010 by Hayli*

**Pre CAL!! Please HELP**

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

*November 4, 2010 by Hayli*

**pre-cal**

please help, step by step having difficulty here as well. Find the term containing x5 in the expansion of (x + 2y)^10

*August 12, 2015 by James*

**Pre-Cal(Please check)**

Approximate the equation's solutions in the interval (0,2pi) sin2x sinx = cosx 2cos(x) (1/2-sin^2x) = 0 Then I got 3pi/2, pi/2, pi/6 and 5pi/6 Then I substituted 0-3 and got 3pi/2 , 5pi/2 , 9pi/2 , pi/2, pi/6, 7pi/6, 13pi/6 , 19pi/6 , 5pi/6 , 11pi/6 , 17pi/6 and 23pi/6. My ...

*March 11, 2010 by Abbey*

**Chemistry**

Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(...

*November 16, 2009 by Christina*

**Chemistry Help!!!!**

Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(...

*November 16, 2009 by Christina*

**Chemistry**

Calculate S (measure of total entropy) for the following reaction at 25C and 1atm, and tell whether the entropy is increasing or decreasing. C3H8(g)+5O2(g)-> 3CO2(g)+4H2O(g) S of C3H8=64.5 cal/(mol*K) S of O2= 49 cal/(mol*K) S of CO2= 51.1 cal/(mol*K) S of H2O= 45.1 cal/(...

*November 16, 2009 by Christina*

**Pre cal**

)a function f is defined as f(x) = 3*2^x describe the end behavior of f, please describe in detail how you got the answer and explain your abbreviations.

*July 25, 2011 by Ashley*

**Chemistry**

How much heat is released when 10 g of steam at 100°C is cooled to 10 g of liquid water at 100°C? I am working on a practice test and the answer is not in the back of the book. Can some one help me. 1. 10 cal 2. 5400 cal 3. 800 cal 4. 6200 cal

*November 10, 2011 by nan*

**Pre-Cal(Please help)**

1) Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67 degrees 30'

*March 8, 2010 by Abbey*

**Pre cal**

Fine a third degree polynomial function f(x) with real coefficients that has 4 and 2i are zeros and such that f(-1) =-50 4 21 -2i (x-4)(x-2i)(x+2i) (x-4)(x2+4) x3-16+4x-4x2 (x3-4x2+4x-16) -50=a(-1-4-4-16) -50=.25 a=2 Not understanding, please help

*September 4, 2016 by Sally*

**Pre-Cal(Please help)**

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

*March 23, 2010 by Hannah*

**pre-cal**

Can someone please show me how to find an equation for the line with the given properties. Parellel to the lines 3x-y= -3; containing the point (0,0) y= (then type your answer in slope intercept form)

*October 13, 2012 by ladybug*

**chemistry**

How many calories are required to heat 25.0 g of platinum from 24.5 °C to 75°C (specific heat of platinum = 0.139 J/gK)? 1. 47 cal 2. 42 cal 3. 48 cal 4. 20 cal 5. 80 cal Thank you.

*November 22, 2009 by Danny*

**Pre-Cal(Please help)**

Give the domain of the function and identify any vertical or horizontal asymptotes. h(x) = 1 / x - 3 + 1 I had x = 0 and y = 3. Would the domain be all numbers except 1?

*March 26, 2010 by Hannah*

**Pre-Cal(Please help)**

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

*March 27, 2010 by Abbey*

**Pre-Cal**

xy=2 {{x^2=3+y^2}}

*October 21, 2008 by Ash*

**Pre Cal**

1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3

*January 29, 2010 by Lauren*

**pre cal**

3(2x-1)^2 (2) (x+3)^1/2 + (2x-1)^3 (1/2) (x+3)^-1/2

*February 13, 2013 by shenyce*

**Pre cal**

ix^2-2x+i=0

*March 17, 2013 by Anonymous*

**Pre Cal**

x 2 + y 2 = 0

*February 25, 2016 by Wayne*

**pre cal**

x^2+bx+ ?=(x+ ? )^2.

*July 7, 2016 by ari*

**pre cal**

(x/x-1)-(x/x+1) -2=0

*July 11, 2016 by ari*

**pre cal**

1/(x-1)- x/(x+1)-2=0

*July 11, 2016 by ari*

**Physics**

A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. How much heat ...

*November 27, 2016 by Clarity*

**pre-cal**

A "super ball" dropped from a height of x feet bounces to a height y that is 80% of x. Can anyone please teach me how to find its numerical, algebraic, and graphical representations? Thanks a lot!!!

*March 1, 2008 by Lusi*

**Pre-Cal**

1) use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67 degrees and 30' Please explain!! I do not know how to start.

*March 1, 2010 by Janet*

**college (Physical Science/Physics)**

I am having difficulty with this equation. I have been working with it for several weeks! Please Help. the equation is this: solve for Lf Lf=[(CwMw+CsMs+CcMc)(To-Tf)//Mi-CwTf values Cw=1.00; Mw=143.4; Cs=0.11; Ms=30.0; Cc=0.22; Mc=57.7;To=23.9; Tf=14.2;Mi=16.7 I keep comming ...

*April 17, 2009 by Jennifer*

**Pre-Cal**

Find two functions f and g such that (f X g)(x) = h(x). (There are many correct answers.) h(x) = 4 / (5x + 2)^2 = My answers were: f(x) = 4 / 5x, and g(x) = 5x + 2 Please explain. These answers were wrong and I do not know how to fix them!!

*March 25, 2010 by Hannah*

**pre - cal**

12-5y^2 what's the question?

*August 20, 2007 by Anonymous*

**Pre-Cal**

What are bearings??

*February 5, 2008 by Daisy M.*

**pre cal**

what is the sum of e or 1n

*January 11, 2009 by ash*

**Pre Cal**

Solve for x 2^x=8^x-3

*December 22, 2009 by Raina*

**pre cal**

solve for x 8x-(2x-1)=3x-10

*February 1, 2010 by deonte*

**Pre Cal**

What is the inverse of g(x)= 1/2(x-1)^3-4

*October 25, 2010 by Katie*

**pre cal**

(y^2)^-4y^8 simplify

*August 30, 2012 by jennifer*

**Pre-Cal.**

How does this go from x^2+ to 2i, explain.

*January 8, 2013 by phyllys*

**Pre-Cal**

tan-1=43\9.3

*May 1, 2013 by Anonymous*

**Pre-Cal**

2y=cos(4(t-6))+6

*April 22, 2014 by Anonymous*

**pre cal**

f(x) = 3x + 5, g(x) = 6x^2 Find (fg)(x)

*June 23, 2014 by Jorgeeee*

**Pre cal**

sin55=12/b what is b

*April 7, 2016 by Sam*

**Pre Cal help please!!**

given f(x) = { 2x^2 + 5 x < or equal to 2 3 - x^2 x > 2 find lim f(x) x -> 2^+ lim f(x) x -> 2^- lim f(x) x -> 2

*October 1, 2016 by Jessie*

**Pre-Cal Help Please!!**

Use logarithms to solve the given equation. (Round the answer to four decimal places.) 6(1.02^3x + 1) = 11 How do i find the answer after 1.03^3x +1 = (11/6) Do i put a log on 1.03 or do I do something else Thank you.

*February 28, 2012 by Ann*

**Pre-Cal/Trigonometry **

Triangle ABC is given where angle A=64 degrees, a=16 in., and the height, h, is 15.3 in. How many distinct triangles can be made with the given measurements? Please explain your answer to your best ability

*March 28, 2017 by Emily*

**Chemistry**

Which of the following is the correct unit for specific heat? degree C*** Cal cal/g cal/(g*deg C)

*May 16, 2016 by Ben*

**pre-cal**

find the value(s) of x for which f(x)=g(x). f(x)=x^4-2x^2,g(x)=2x^2

*August 28, 2007 by Kira*

**Pre-Cal (again)**

If: f(x)= 3/x^2-1 g(x)= x+1 What is the domain of f, g, and f o g?

*September 20, 2008 by Crystal*

**pre cal**

What would cos2theta=-1/2 be???

*November 15, 2008 by becca*

**Pre-Cal**

Find f X g 3 sqrt of x+1 X x^3+1

*February 26, 2009 by Dan*

**Pre-Cal**

Simplify e^3ln2-1

*January 9, 2010 by jamie*

**pre-cal**

(576^1/2+512^1/3)^1/3

*May 31, 2010 by Soto*

**pre-cal**

tan((theta/2)+(pi/6))=-1

*July 2, 2011 by vince*

**Pre Cal**

simplify the quotient: [x(5x+1)-3(x^2+1)]/ [(x-1)^2]

*July 24, 2011 by Ashley*

**Pre Cal**

cos^2+tan^2=1

*March 25, 2012 by Trevion*

**Pre Cal**

cos 75 deg

*April 9, 2012 by Kara*

**pre cal**

7tan^2(pheta)-2=3

*June 28, 2012 by Maria*