Sunday

October 4, 2015
Number of results: 50,109

**Precalculus**

Consider the equation 7sin^2x - (4sin2^x)/cosx = -1 a) Put the equation in standard quadratic trig equation form. Why is it 7sin^2x - 8sinx + 1 =0?
*January 27, 2012 by Melissa*

**math**

one-half of a number is 8 less than two-thirds of the number. write algebraic equation: the sum of x and 8 is 15 write algebraic equation: 4 more than x is 9 write algebraic equation: 5 less than twice x is equal to 35 write algebraic equation: the product of 10 and x is the ...
*May 14, 2013 by ji*

**Geometry **

one-half of a number is 8 less than two-thirds of the number. write algebraic equation: the sum of x and 8 is 15 write algebraic equation: 4 more than x is 9 write algebraic equation: 5 less than twice x is equal to 35 write algebraic equation: the product of 10 and x is the ...
*May 14, 2013 by ji*

**algebra**

The ball is kicked straight up in the air from 4' off the ground Original velocity is 60' per second How many secs does it take to hit the ground. Do I use complete the square, square root property, quadratic formula, factoring? formula is h= 16tsquared + 60t +4
*May 22, 2013 by barb*

**Algebra**

Which is NOT true about the following table. X. 1, 2, 3, 4 Y 1, 4, 9, 16 A. It shows a linear function******** B. x increases by 1 each time C. The rate of change is not constant D. Y increases by a different value each time Write a quadratic function rule for the given table ...
*February 16, 2015 by BUBBLES*

**Science/ Chemistry**

When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for the reaction of ...
*September 22, 2013 by James*

**chemistry**

write a balanced formula equation for the reaction between sulfuric acid and calcium metal
*May 13, 2008 by trista*

**maths!**

the formula h=15t-5t^2 gives the height 'h' metres of a ball, 't' seconds after it is thrown up into the air. (i) find the times when the height is 10m (ii) after how long does the bal hit the ground? ive figured out that the answer to (i) is t= 1 or 2 by using the quadratic ...
*August 6, 2008 by jessica*

**TO: DrBob222 science**

1. Write the chemical formula for each of the following acids: a.) hydrocyanic acid b.) oxalic acid c.) chlorous acid d.) nitric acid 2. Write the acid name or chemical formula for each of the following: a.) HBr b.) sulfurous acid c.) HClO4 D.) phosphoric acid 3. First ...
*March 20, 2014 by Anonymous *

**math**

Q. Naomi has a formula that allows her to convert Clesius temperatures to Farenheit temperatures. She needs a formula for converting Fahrenheit temperatures to Celsius tempertures. What advice can you give her? I am thinking that I just reverse the preocess of the first ...
*January 24, 2007 by catalina*

**Math**

how do you solve for y in the expression: x^3=y(y+3)? x^3=y^2 + 3y y^2+3y- x^3=0 Using the quadratic formula.. y= (-3+-sqrt(9+4x^3) )/2
*August 24, 2006 by Jamie*

**college math 209**

use the quadratic formula to solve for x, 3x^2 + x -8=0
*January 16, 2011 by Anonymous*

** 11th grade-math**

help me Use the Quadratic Formula to solve N2=6n
*May 24, 2011 by kayla*

**math-calculus**

x-1/x+1 = 2x/15 (15)(x-1) = (2x)(x+1) 2x^2-15x+17 do i put this in quadratic formula? i so confused.
*January 7, 2012 by Shreya*

**math-calculus**

30/x^2-25 = 3/x-5-2/x+5 i be left with 30 = 3x^2-75-2x^2+50 i not sure what to do? i use the quadratic formula?
*January 7, 2012 by Shreya*

**math**

48x^2-32x-35=0 quadratic formula is x=-b+/-b^2-4ac/2a please help
*October 26, 2012 by danica *

**math**

find the real solutions using the quadratic formula 6-(1/x)-(4/x^2)=0
*December 2, 2012 by brad*

**Math Help now !!!! Plz**

Solve using the quadratic formula X^2-4x=21
*December 12, 2012 by David*

**algebra 2**

x^2 - 3x + 5 = 0. solve using quadratic formula. show solution
*January 15, 2014 by em*

**Pre Calcu**

Use the quadratic formula to find the zeros of f F(x)=2x^2-4x-11
*January 26, 2014 by Anonymous*

**algebra**

2x^=5-2x find the real solution using the quadratic formula
*September 5, 2014 by sue*

**math**

What will be the answer of 4x(x-1)+5=0 when i'll use quadratic formula to solve it. Thank you ! ^___^
*September 11, 2014 by ghenny*

**math**

Please solve these using the quadratic formula: 1. 3x^2-4(x-2)=0 2.a^2+2(a++5)=0 3.x^2-3(2x+3)=0 Thank you ^____^
*September 11, 2014 by ghenny*

**Algebra 2 **

How do I solve this using the Quadratic formula and finding the determinant? 1. 5x-6=0 2. x+25=0
*November 12, 2014 by Jessica*

**mathematics**

Use the quadratic formula to find the exact roots of 2x² = 5x + 2
*August 26, 2015 by Anonymous*

**College Algebra**

Use quadratic formula to solve: 5x^2-10x+6=0
*September 29, 2015 by Tim*

**ALGEBRA**

how do i solve this linear equation: 3x/4 + 6 = -12 (3x over 4 is a fraction) and this quadratic equation..... -4x squared = 0??
*September 10, 2009 by ggift*

**maths**

The following quadratic equation has the integer solutions x^2+5x-6=0 what is the positive solution of the equation
*March 29, 2011 by elizabeth*

**Equation**

-4x (little 2) =0 Not sure what name the technique means. I know this is a Quadratic Equation.
*June 19, 2010 by Lisa*

**Algebra1 HELP PLEASE**

The solutions to a quadratic equation are -1 and 7. What is the equation of its axis of symmetry?
*July 3, 2013 by lisa*

**maths**

quadratic equation solve the equation by factorization 27x^2 - 126x = 0 So x=? or x=?
*August 1, 2013 by gean*

**Algebra**

The following equation is quadratic. f(x)=(x-7)(3x-2) What are the x-intercepts of the graph of the related equation y=(x-7)(3x+2)? A) -7 and 2/3 B) -7 and 3/2 C) -3/2 and 7 D) -2/3 and 7
*April 30, 2015 by Ashley*

**Algebra**

Please show me how to solve this problem. 8/x^2-16 + 3/4 = 1/x-4 multiply each of the terms by x^2, collect your like terms and bring them all to the left side. You will have a quadratic equation. BTW, since you did not use brackets I will assume your last term is (1/x)-4 and ...
*May 8, 2007 by Marie*

**Algebra help**

Match the equation 4x^6-2x^3+1=0. With a substitution from the column that could be used to reduced the equation to quadratic form: a) u=x^-1/3 b) u=x^1/3 c) u=x^-2 d) u=x^2 e) u=x^-2/3 f) u=x^3 g) u=x^2/3 h) u= x^4
*March 24, 2011 by Miguel*

**Algebra help**

Match the equation 4x^6-2x^3+1=0. With a substitution from the column that could be used to reduced the equation to quadratic form: a) u=x^-1/3 b) u=x^1/3 c) u=x^-2 d) u=x^2 e) u=x^-2/3 f) u=x^3 g) u=x^2/3 h) u= x^4
*March 24, 2011 by Miguel*

**Math**

1)If the roots of a quadratic equation are -2 and 3, the equation can be written as A) (x+2)(x+3) B) (x-2)(x+3)** C) (x+2)(x-2) D) (x-2)(x-3) Is the answer B? If someone could help me that would be great.
*April 29, 2015 by Alan*

**algebra II**

Can you please help me with the these problems. 8.Write an equation in standard form of the parabola that has the same shape as the graph of f(x) = 11x^2, but which has its vertex at (2, 9). 10. Use the vertex and intercepts to sketch the graph of the quadratic function. y + 3...
*October 13, 2007 by Ashley*

**Chemistry**

Water is added to 4.267 grams of UF6. The only products are 3.730 grams of a solid containing only uranium, oxygen and fluorine and 0.970 gram of gas. The gas is 95.0% flourine, and the remainder is hydrogen. From data determine the empirical formula of the gas. What fraction ...
*January 9, 2011 by deanna*

**chemistry**

Water is added to 4.267 grams of UF6. The only products are 3.730 grams of a solid containing only uranium, oxygen and fluorine and 0.970 gram of gas. The gas is 95.0% flourine, and the remainder is hydrogen. From data determine the empirical formula of the gas. What fraction...
*January 9, 2011 by Deanne*

**math,help,algebra I**

I need help can someone help me get unstuck and let me know if i am correct.thank you. solve by completing the square. 4x^2+2x-3=0 this is what i am doing: i used the quadratic equation. so where i am is in this step: x = (-2 (+-) sqrt (-44))/(8) from this point i am stuck: ...
*April 14, 2007 by jasmine20*

**algebra2**

If the discriminant of a quadratic equation is equal to zero, how many real solutions does the equation have? A. 0 B. 1 C. 2 D. 3 please help!!
*June 25, 2012 by laltk*

**algebra1please look over THANK YOU**

The solutions to a quadratic equation are -1 and 7. What is the equation of its axis of symmetry? I GOT 3 is that right
*July 3, 2013 by lisa*

**quadratic equation**

what's the positive root of the following equation x(square)=7x+8
*February 8, 2012 by tanya*

**quadriatic equation**

solve and check each of the following quadratic equation (1)x^+x-6=0 (2)x^+8x+15=0 (3)x^+2x+1=0 (4)x^-3x-4=0 (5)x^-4x-32=0
*February 15, 2012 by tanya*

**Chemistry**

Dilute H3PO4(aq) and NaOH(aq) are mixed in chemically equivalent quantities. Write the formula equation for the reaction
*April 30, 2011 by Donna*

**SAT math**

1. x>15-2x / -3 Solve the linear inequality. Write the solution in set builder notation. So, -3x>15-2x, x<-15..? And how do I write it in set builder notation? 2. y+x=9 and 3y=2x + 8. How do I solve this system of equations? 3. Find the maximum y- value of the ...
*June 1, 2013 by mysterychicken*

**algebra**

Hi Dear Jiskha team, I have Algebra homework and I will need some help. The homework is following: Suppose you are using a computer to draw a face on a coordinate plane. The eyes are at (–3, 3) and (3, 3). The tip of the nose is at the origin. To make a smiling mouth, you are ...
*February 22, 2012 by Lily*

**math**

is these answers correct? solve the equation: 2x^2 +8x - 17=(x +2)^2= x=-7,3 solve (v-5)^2-63=0, where v is a real number, simplify answer as much as possible. v=3 square root 7+5,-3 square root7+5 v``12.93725, -2.937254 use the quadratic formula to solve for x. 4x^2x-4=0 =x=1...
*October 31, 2010 by lee*

**PHYSICS**

A DAREDEVIL JUMPS A CANYON 12 METERS WIDE. TO DO SO HE DRIVES A CAR UP A 15 DEGREE INCLINE. a. WHAT IS THE MINIMUM SPEED HE MUST ACHIEVE IN ORDER TO CLEAR THE CANYON? B. IF THE DAREDEVIL JUMPS AT THIS MINIMUM SPEED WHAT WILL HIS SPEED BE WHRN HE REACHES THE OTHER SIDE? Write ...
*November 1, 2006 by Jill Hefner*

**math**

Can someone explain how to label the vertex of this equation. f(x)= -(1/2)x^2. i know how to do these question but when it actually has the other components to the quadratic equation.
*April 6, 2010 by jen*

**Intermediate Algebra**

If the discriminant of a quadratic equation has the given value, determine the number and type of solutions of the equation. A.48 B.0
*April 21, 2012 by Ralph*

**Chem**

Complete the table below: Note: Make simplifying assumptions, do not use the quadratic formula. What is the pH of the solution created by combining 1.90 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH: 1.90 pH w/HCl...
*May 7, 2012 by Jenna*

**college**

Solve; 5X2 - 8 X + 3 = 0 using the quadratic formula the 2 is to the second power a. X = 1 and X = 3/5 b. X = -1 and X = 1/5 c. X = 1 and X = - 2/5 d. X = 3 and X = - 1/3
*April 16, 2009 by deirra*

**math**

Solve; 5X2 - 8 X + 3 = 0 using the quadratic formula . the 2 is second power
*April 16, 2009 by Minnie*

**math**

how to find the values of x?? x^2 - 3x - 7 = 0 tried quadratic formula and completing the square what else can i do??
*October 21, 2010 by john*

**pre cal**

using formula v=-b/2a, 4ac-b^2/4a graph the quadratic function f(x)=x^2-6x+5
*February 3, 2011 by heather*

**college algebra**

find the real solutions, if any. use the quadratic formula 2/3x^2 - x -3=0
*January 23, 2012 by kathy*

**math**

solve(x-1)^2=-4..... i used the quadratic formula but got stock ... please help thank you
*May 16, 2012 by devon*

**math**

1/2x^2=x/4+1 how can i solve that with quadratic formula?plz i need the solution fast.
*January 28, 2013 by Riana*

**math**

solve for x in the following expression using the quadratic formula 3x^2 + 29x - 8.5=0
*February 19, 2013 by Anonymous*

**math**

f(x)=-16t^2-22t+220 Solve using quadratic formula
*October 8, 2014 by spud*

**College Math**

For questions 1-2, apply the quadratic formula to find the roots of the given function, and then graph the function. 1. f(x) = x2 + 4 (6 points) g(x) = x2 - x – 12 For questions 3-4, factor the quadratic expression completely, and find the roots of the expression. 1. (3 ...
*December 12, 2010 by jennie*

**Algebra**

Suppose a market research company finds that at a price (y) of $30, they would sell x =10 t-shirts. If they lower the price to y = $20, then more people would purchase the t-shirts, and they can expect to sell x = 30 t-shirts. Find the equation of the line for the demand ...
*March 30, 2012 by Gurlredneck*

**math**

a patrol boat took 2.5 hours for a round trip 12km upriver and 12km back. the speed of the current was 2 km/h. what was the speed of the boat in still water? ps: i just need to know how to make equations from the question above. it's supposed to create equation, then use the ...
*October 15, 2010 by lawrence*

**8th grade math**

Your uncle is three years older than your aunt. The product of their ages is 3190. What are their ages? I know the answer is 55 and 58. But I can't come up with the correct formula or equation to get the answer. I've tried 3(A+3)=3190. It doesn't come up with the right answer ...
*February 7, 2008 by KL*

**statistics**

I need help with this I already did it on a calculator but now I don't know how to write the formula out on paper like n= for the population and * this or that I m not sure how to write it out help please how do i write this into a formula confide level 95% margin of error 5% ...
*September 7, 2015 by Anoymous*

**Math(Please answer, thank you)**

(4.44e-2 - x) (8.06e-2 - x) / (0.331 + 2x)^2 = 1.80e-2 I need to rearrange this equation so that I can get a,b, and c, for the quadratic equation but I am not sure how to do this. Thank you for the help.
*March 24, 2012 by Hannah*

**MATH**

(2,14),(1,-1),(3,35) Find the quadratic function y=ax^2+bx+c 1) 4a+2b+c=14 2) a+b+c=-1 3) 9a+3b+c= 35 equation 1&2 = 3a + b = 13 equation 1&3 = -5a +5b = -21
*May 12, 2009 by Sarah*

**Equation**

Solve the quadratic equation. 12x2 + 23x + 10 = 0 A.5/4,2/3 B. 5/12, 1/5 C. 5/4, 2/3 D. 5/4, 2/3
*June 28, 2010 by Lisa D*

**Algebra**

Use the quadratic equation to solve the equation: 4k(k+13)=13
*April 26, 2012 by Jay*

**Calculus**

Find the slope-predictor formula and write an equation for the line tangent to (a, f(a)) for f(x) = x2 - 6x + 4. Make sure you detail the process.
*December 16, 2010 by Brian Meredith*

**trig**

write an equation expressing: cos37cos99 as a sum Review question. I know the formula. Having trouble with working it out.
*November 6, 2011 by Gaile*

**Algebra**

1)Solve by factoring:5x^2=4-19x answer=-4,1/5 2)Which quadratic equation has roots 7 and -2/3? answer=A A.2x^2-11x-21=0 B.3x^2-19x-14=0 C.3x^2+23x+14=0 D.2x^2+11x-21=0 3)To solve 4x^2-28x+49=25 by using the square root property,you would first rewrite the equation as answer=(...
*August 12, 2007 by Marissa*

**MATH**

The perimeter of a rectangle is 540ft. Let x represent the width of the rectangle. Write a quadratic function for the area of rectangle in terms of its width. Find the vertex of the graph of the quadratic function and interpret its meaning in the context of the problem.
*June 8, 2014 by Anonymous*

**Quadratic Equations and Functions**

I started having trouble on part (c), and I need to know this before I can go onto the other problems. Plz help! The parabola shown at the right (no picture, sorry) is of the form y=x^2+bx+c. The graph's y-intercept is (0,2), the axis of symmetry is -2.5 and the two points ...
*February 4, 2007 by Emily*

**math**

Theses are just some problems i did not understand how to do so if you could please explain and write the answer(: anything helps thank you(: 2. Simplify ---(3x^11z^5)^3 b. (3x^5)^ -3 / 2x-5(3y)^4 c.3x^5)^ -3 / 2x ^ -5(3y)^4 (same as b but - 5 is the exponent) 3a.x^2 / 5 + x-5...
*March 14, 2010 by Alyssa Pacheco*

**math 116**

a. Write an equation in the “y = mx + b” format for the canal that runs through the Toaster Company property. Solve for “m” and “b” in the “y = mx + b” formula. The canal crosses the x-axis at -16 and crosses the y-axis at 3. See the chart for a visual. ( b. Write an equation ...
*November 1, 2010 by dwayne*

**math 116**

a. Write an equation in the “y = mx + b” format for the canal that runs through the Toaster Company property. Solve for “m” and “b” in the “y = mx + b” formula. The canal crosses the x-axis at -16 and crosses the y-axis at 3. See the chart for a visual. ( b. Write an equation ...
*November 1, 2010 by dwayne*

**algebra**

Solve using the quadratic formula and leave the answer in radical form: y^2+6y-1=0
*March 10, 2011 by mimi*

**Precalculus**

Solve for x, 0<x<2pi 3sin^2x - sinx -2=0 Its not factorable, do I use quadratic formula?
*January 31, 2012 by jake*

**Honors Chemistry**

I need someone to check these questions. I know its a lot of questions. 2NH3 + Ag+ Ag(NH3)2+ a. What is the Lewis acid in this equation? [Ag+] b. What is the Lewis base in this equation? [NH3] Given H2SO4 is sulfuric acid, HNO3 is nitric acid, and H3PO4 is phosphoric acid, ...
*May 7, 2012 by Elizabeth*

**algebra**

Can you use algebra to find a quadratic equation if your know the coordinates of just ONE point on its graph? Can you use algebra to find a quadratic equation if your know the coordinates of just TWO points on its graph? If so, what information is needed?
*October 6, 2011 by Sejul*

**quadratic functions**

The graph of a quadratic function can have 0, 1 or 2 x-intercepts. How can you predict the number of x-intercepts without drawing the graph or (completely) solving the related equation? Suppose that the graph of f(x) = ax^2+bx+c has x-intercepts (m,0) and (n,0). What are the x...
*June 6, 2015 by anonymous*

**Chemistry**

Sulfur dioxide gas is bubbled through sodium hydroxide solution Write the balanced formula equation for this reaction
*April 12, 2011 by Janie*

**Math**

(2,14),(1,-1),(3,35) Find the quadratic function y=ax^2+bx+c 1) 4a+2b+c=14 2) a+b+c=-1 3) 9a+3b+c= 35 equation 1&2 = 3a + b = 13 equation 1&3 = -5a +5b = -21 i know you take those two equations now 3a + b = 13 -5a - 5b = -21 multiply the top by 5 and the bottom equation by 3 ...
*May 12, 2009 by Sarah*

**College Math**

Another question which is confusing. The position of an object moving in a straight line is give by s=2t^2-3t, where is s in metres and t is the time in seconds the object has been in motion.. how long will it is take the object to move 6 meters? I first used the simplfying ...
*September 29, 2011 by HM*

**math,help**

on one of last week homeworks i got this one wrong can someone explain to me what is the correct format. The demand supply equations for a certain item are given by: D= -5p+40 S=-p^2+30p-8 The correct answer was: $1.43 how do you get to this answer because i've tried it and it...
*April 19, 2007 by jasmine20*

**math**

Algebraically analyze the graph of the function f(x)= -6x^2+5x+2 . Find the vertex, axis of symmetry, range, minimum or maximum value, increasing and decreasing intervals, and zeros. Write the Quadratic equation in standard form. [Standard form is: f(x)=a(x-h)^2+k ]
*September 30, 2008 by shannon*

**Math**

Football Lesson 5.1 1. y= -0.035x^2 + 1.4x + 1, where x is the distance (in yards) and y is the height (in yards) a. Does the graph open up or down? b. Does the graph have a Maximum value or a minimum value? c. graph the quadratic function. (i'll graph it just write it in the ...
*November 11, 2007 by Monte'*

**chem help**

i just don't know where to begin/how a) Write a balanced chemical equation for: potassium carbonate + magnesium chloride b) Write a balanced chemical equation for: sulfuric acid + calcium carbonate c) Write a balanced chemical equation for: sodium sulfate + calcium nitrate d) ...
*January 15, 2013 by thad*

**math**

(a) Complete the square by writing in the form . Note: the numbers and can be positive or negative. x^2-14x-17=(x-7)^2+ (b) Solve the equation by completing the square or using the quadratic formula. If there is more than one correct answer, enter your answers as a comma ...
*September 6, 2012 by Anonymous*

**Math - Solving equation (check )**

7 = (210+88t)/(2(sqrt(210t+44t^2))) Is t= 1.0479....? I got the denominator multiplied by 7 and squared both sides to eliminate the sqrt and then simplified, used the quadratic formula to find the values but since the questions is about squirrels growth it can not be a ...
*October 22, 2010 by Anonymous*

**College Algebra**

Solve 2x(squared)-3x-2=0 using the quadratic formula. Can someone explain this to me please?
*November 18, 2007 by Alicia*

**Math**

Solve; 5X2 - 8 X + 3 = 0 using the quadratic formula the 2 is second power can someone explain
*April 16, 2009 by Tracy*

**Algebra**

Do you know a site with some practice problems for a quadratic formula (ax^2 + bx + c) for my test tomorrow? Thank you so much!
*May 28, 2009 by Gemma*

**Algebra 2 URGENT**

Solve by using the quadratic formula. Please Show All Work! 4x(x+3)=15
*November 18, 2009 by Trisan*

**Algebra**

Use the quadratic formula to find the real solutions: 2x/x-3 + 2/x = 3 I know I multiply both sides by x(x-3), but I don't know how to do that.
*August 22, 2010 by Aless*

**Math**

1/4=3-2x-1/x+2..so far i have 8x^2-19x+4=0 do i use quadratic formula to solve the rest of the way?
*September 21, 2010 by Roger*

**Algebra 1**

X^2-14x+3=-10 Ineed to know how to find the discriminant quadratic formula and by tabe and graph it Please help me
*June 1, 2011 by David*

**Algebra1 HELP PLEASE**

Solve 7⋅x = x2 - 6 by using the Quadratic Formula. Round to the nearest tenth.
*July 5, 2013 by lisa*