# mathematics: algebra;equations

49,415 results, page 44

### calc

cylindrical shells the problem says rotate about the x-axis these are the two equations given: x+y=3 AND x-4=-(y-1)^2

### chemical equations

Is the answer 51g H2O for my question what mass of water is needed to react with 32.9g LI3N?

### 8th grade math

do you have anything on linear equations or categories on FCAT because I need to study. :)

### Math

What is the relationship of the two lines with the equations -3y=x-6 and y=3x+1? I am very confused. Please explain how you got your answer!

### Chemistry

What are the equations for the following? Positron emission from silicon-26 and Sodium-22 undergoes electron capture I really don't get it Thank you

### Mathamatics

Solve the following equations: x^2 = 108 (Give your answers correct to one decimal place.)

### chemistry

1) write net equations for the reactions in which of the following ions? sulfate aion- chloride ion-

### calculus

Given that x3-axy+3ay2=3a3 Find the equations for the tangent and normal lines at point (a,a)

### Math

I don't understand how to solve equations with logarithms very well...can you help please? here is one im stuck on: log (3r+5)= 5 2 Thanks!!

### math

Write down the gradient and the y-intercept of the straight lines whose equations are given as follows: a) y=2x-4, b) 2y=x+6, c) y-x=2, d) 2x+3y=6-x

### Chemistry

The pH of a 0.0050 M aqueous solution of calcium hydroxide is? Make sure to include all equations.

### math

If the cards contain the following equations, what is the probability that a student will graph a line whose slope is 3? 3y = 9x + 3 x(x + 3) = 0 3x + y = 0 x = 3y x2 + 3 = 0 y - 3x = 0

### Math

Are the differential equations separable or not? 1. y'= ye^(x+y) 2. y'= ye^(xy) 3. y'= y(xcos(y)) If they are, could you show how? Any help, even on one, would be extremely appreciated!

### Math

What is the difference between a linear and a quadratic model? How do I know which one is good for the graph? :S I know it has to do with equations to find R2

### chemistry

Write a paragraph explaining how to determine how many hydrogen atoms are in 6.5g of water. No equations are permitted in this answer.

### chemistry

Balance these equations 1. Kclo3-kcl+oz 2. K2cr2o7+h2so4-k2so4+cr2+o(so4)3+h2o

### Math

Could someone give me an example of a linear eqution using elimination to solve the systems of equations?

### calculus

Find Mx, My, and (x, y) for the laminas of uniform density Ï bounded by the graphs of the equations. (Use rho for Ï as necessary.) y =1/5 y = 0 x = 4

### Chemistry PLZ HELP!!!!!

give equations showing the commercial methods for preparations of the halogen (F2, Cl2, Br2, I2)

### calculus exam review

write two different vector equations for the plane that contains the points A(6,1,4), B(-3,7,9), C(5,0,3)

### pre calculus

Algebraically solve the system of equations using any method you wish 3x-10y+z=5 -4x+9y-z=-6 -13y+z=2

### Math

Explain how you can determine whether a system of two linear equations will be consisten, dependent, or inconsistent?

### math help please

Solve the following system of equations using substitution. What is the value of y? 2x + 3y = 105 x + 2y = 65 A.15 B.25 C.40 D.65 I think it is B??

### Math

Use the method of elimination to solve the following system of equations. You must check your answer: 1)x/2 + y/5 = 1/2 2) 3x - y = -8

### math

x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13. What is the sum of all (distinct) possible values of x?

### math linear equations

would the equation in slope-intercept form of the line which passes through 0,6 and 4,3 be y = -3/4x + 6?

### CHEMISTRY HELP! D;

Balancing Chemical Equations; How would you solve this? 1.Br2(g) + ___H2O(l) + ___SO2(g) ---> ___HBr(aq) + ___H2SO4(aq)

### Literal Equations

y + 2x = 5; x = -1 How do I solve for y? What I did was move y to the other side and divide all the values by 2. So, I first got x = 2.5 - y/2.

### Maths

The line segment connecting two points (-2,7) and (4,-1) can be expressed in parametric equations as x=-a+bt, y=c-dt (0<=t<=1). Find the values a,b,c,d.

### Maths

Let a*pi be the area of the region bounded by the curve defined by the parametric equations x=10cos2t, y=10sin2t where 0<=t<=2pi. What is a?

### Chemistry

Use equations to explain how a buffer system, such as hno2:no2, reacts with h3o and oh?

### Pre-Calculus

Write an equation in slope-intercept form of the line with the given parametric equations. x=t+6 y=2t-4

### math

Find the solution to the system of equations given below using elimination by addition. 5x + 20y = 40 x + 3y = 6

### Equations

How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite

### maths

Write the equations below in the form y = mx + c. State how many solutions each systems of linear equation have. 3x = 6y 2y - 6x + 2 = 0

### MATH

Solve the system of linear equations 2x+y-3z=4 4x+2z=10 -2x+3y-13z=-8 *im so lost (all these numbers are in one problem)

### physics

Fall time under g is sqrt 2h/g. Can someone give a derivation from the equations of motion please? Thanks.

### Math

Solve the following system of equations using both substitutio and elimination y=-x+4 y=-2x-4 Do I do what I do with the previous problems

### Math

Directions: Solve this system of linear equations. Write the final answer as an ordered pair (x, y, z). 2x + 4y - z = 7 2x - 4y + 2z = -6 x + 4y + z = 0

### math

If it says use the method of substitution to solve the system of linear equations 3a=6-b 3a=4-b How do i find the solution

### HELP PLEASE

Solve the system of equations using matrices. Use Gaussian elimination with back- substitution. x+y+z = -5 x-y+3z = -1 4x+y+z = -2

### Gen Chem

Predict products and balance equations for the reactants shown. Pb 2+(aq) + H2PO4 1-(aq)--->? Pb 2+(aq) + HPO4 2-(aq)--->? Pb 2+(aq) + PO4 3-(aq)---->?

### Precal

How would you work this out? This is verifying trigonometric equations. cot^3x+ cotx= cosx(csc^3x)

### Maths

Solve the following equations for 0 < x < 2pi A) sin^2x=2sinxcosx B) 3tanx=cosx Please help Thankyou

### Math

WhT is there relationship between the lines having the equations y=4x+2 and y=1/4x? Is it because they are neither parallel nor perpendicular?

### QUANTITATIVE

when 3 times a certain number is subtracted from 14 , the result is 2 more than R. which of the following equations expresses the value of R.

### math homework help please?!!

solve the system of equations algebraically for real values of x and y { x + y = 16 x^2 + y^2 = 128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

### precalculus

find two sets of parametric equations for the given rectangular equation x+y^2=4 can you check my work? x=-y^2+4 y=-t^2 x=-t^2+4 x=-t^3 y=-t^3+4

### maths

Solve the following system of linear equations using matrix method. i)2x+y-2z=10 y+10z=-28 3y+16z=-42

### math

a + bc = -1 b + ac = -1 c + ab = -1 Which of these values of 'a' is one solution for this system of equations? A) -2 B) -1 C) 0 D) 2 Please also explain how you got the answer, thanks.

### science

Balance the equations. AI+CuO-->AI2O3=Cu Fe2O3=C-->Fe=CO2 SO2=O2-->So3 i need help please

### AED

What skills will you teach and how will you teach them in mathematics. need 200 words and all I have so far is: I can teach this concept to students in a lower elementary grade and to students in a middle school grade by

### mathematics

Discuss the equation 2x^2-y^2+4x+4y-4=0 centrr, transverse axis, vertices foci TWo point s equation of asymptope x=2cost y=3cost 0 is less than or equal to t and t is less than or equal to pi. Find rectangular equation

### maths

a mathematics question contained 20 items. every wrong answer scores -2marks, every correct answer scores 4marks and no mark for no answer. find the maximum possible score

### General Mathematics

A jeepney ride costs P8.00 for the first 4 kilometers, and each additional integer kilometers adds P1.50 to the fare. Use a piecewise function to represent the jeepney fare in terms of the distance (d) in kilometers.

### AED

How do classroom management issues differ, depending on the subject matter? For instance, how can you manage an English lang. arts or social studies classroom differently than you can a mathematics or science classroom? Math and science you can do experiments and the other two...

### discrete mathematics

problem has to do with three valued logic, ie the values 1, 1/2, 0 interpreted as true, unknown, and false. i need to establish the connectives for the 3 valued logic, construct truth tables for the negation, conjunction, disjunction, the conditional, and biconditional. not ...

### Business mathematics

Jenny purchases a piano for rm 7000. She pays down payment of rm 2000 and agrees to pay the balance in 15 equal monthly payments, the first due in one month. If the dealer charges her 5% compounded monthly , find her monthly payment.

### Re: Physics/Math

Calculate the ratio of the drag force on a passenger jet flying with a speed of 750 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at one-fifth the speed and half the altitude of the jet. At 10 km the density of air is 0.38 kg/m3 and at 5.0 km...

### Mathematics

The triathlete swam 2 miles in 56 minutes. Then, he rode his bicycle 100 miles in 5 hours. Finally, he ran 20 miles in 106 minutes. How many minutes did it take him to complete the course? During which portion of the race did he have the greatest average speed?

### mathematics

a boat travels 12 km upstream and back in 1 hour and 45 min.if the speed of the current is 3 km/h throughout,find the speed of the boat in still water,giving your answer correct to 3 decimal place. NOTE:(Answer is 14.3 km/h,so can any one show me the solution).

### Discrete Mathematics

It was proven during the previous lecture that 1+2+3+....+n=[n(n+1)]/2. Using that result, find the sum of all 3-digit palindromes: a palindrome is a number that can be written as ABA, where 1=<A<=9 and 0<=B<=9. Hint: decompose ABA = 100*A + 10*B + A and use above ...

### survey of mathematics

Search the internet to find a current article (published within january or february 2013 ) that provides statistical information relating to public policy and which you think is misleading. Explain why you feel the statistical information is misleading.

### Mathematics

An rectangular area of 25 square meters, around an ancient historical site, is to be fenced to protect the artifacts. The sides with length x cost $ 34/ m and the other two sides cost $ 26 /m. a. Write an expression for the cost as a function of x. C(x) = b. The value of x for...

### Math

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23? Your multiple choices are a. 5 students b. 6 students c. 27 students d. 19 students

### mathematics

in a positive number of two digits,the sum of the digits is 15.if the digits are interchanged the number is increased by 9.find the number.

### General Mathematics

Use a table of t-values to estimate the P-value for the specified one-mean t-test. Left-tailed test, n = 12, t = -3.412 Choose one below: P < 0.005 P > 0.005 0.005 < P < 0.01 0.01 < P < 0.025

### Fractional Exponent (Math-II)

A mathematics teacher bought a birthday cake for his son with the dedication Happy (2 raise to 5/2 .(the dot means times) 2 raise to 3/4 divided by 2 raise to 1/4) Birthday!!! How old is his son? kindly help me...

### Fractional Exponent (Math-II)

A mathematics teacher bought a birthday cake for his son with the dedication Happy Birthday!!! (2 raise to 5/2 .(the dot means times) 2 raise to 3/4 divided by 2 raise to 1/4)th How old is his son? kindly help me...

### mathematics

the greatest and the least resultants of two forces acting on a body are 35kN and 5kN respectively,determine the magnitude of the forces,what would be the angle between these forces if the magnitude of the resultant is stated to be 5kN

### Mathematics

If someone has an 88% in a class and their total quiz grade is 95%, if they were to have a 2% extra credit added to their grade, could their total grade become a 90%? // They think it may have a score similar to 8/5 or 9/5. This is just a regular question for a friend. Any ...

### Mathematics for social science

1.There are 20 people in a club. In how many ways can the club elect a president, a secretary and a treasurer, on person can hold more than one office? 2. How many ways can a committee of 4 people be selected from a group of 10 people?

### Mathematics

a costume designer brought 2 1/2 yards of black silk, 3 yeards 6 inches of white silk, and 6 1/3 yeards of blue silk. how many yeards of silk did she buy?

### Mathematics

a bus travelled at at average speed of 54km/hour from lape town to cape town calculate in km the distance from lape to cape town

### Math

Considering the word Mathematics, what is the ratio of vowels to consonants? Write the ratio 3 ways. word form: colon form: fraction form:

### Math

Considering the word Mathematics, what is the ratio of vowels to consonants? Write this ratio 3 ways: Word form: Fraction form: Colon form:

### mathematics

a public ferry travelled 220 km along with current of the wind it's travelled 63 km against the current 24 km/hr at the same time. find the current of the wind?

### Algebra

when writing linear equations, how do you determine which form of a line to use? choose 1 set of points from the choices below. then, solve the problem and post your solution, showing your steps. write an equation in point-slope form for the line that passes through one of the...

### Algebra

Use a system of equations to solve the following problem. The local theater has three types of seats for Broadway plays: main floor, balcony, and mezzanine. Main floor tickets are $59, balcony tickets are $50, and mezzanine tickets are $40. One particular night, sales totaled...

### mathematics

it takes 12 men to make 12 tables in 9 hours. how long will it take 8 men to make 32 tables?

### Mathematics

Find a fraction which reduces to 3/4 when the numerator and denominator are each decreased by 1, and which reduces to 4/5 when the numerator and denominator are each increased by 1.

### Mathematics

Find a fraction which reduces to 3/4 when the numerator and denominator are each decreased by 1, and which reduces to 4/5 when the numerator and denominator are each increased by 1.

### Mathematics

Find the values of x when, x raised to the power root x = x raised to the power x whole under root.

### Mathematics

1. 2/(2/3)+3/4/(4/5)= A. 1/5 B. 11/15 C. 47/60 D. 3 13/30 E. 12 2. If 2/5 of (2/3)/(5/6) is divided by 3/10, what is the resulting value? A. 1/15 B. 12/25 C. 8/15 D. 5/3 E. 125/27 3. Solve for x: 2x+3<=11 Are there two answers? 4. Solve for x: 3x+4>=5x-8 Are there two ...

### Mathematics

If a measurement of 2.25 inches on a map represents 50 miles, what distance does a measurement of 18 inches on the map represent?

### maths

in your class 5/6 of the learners are good with mathematics.Of these 3/4 enjoy geometry.What fraction of the class enjoy geometry

### algebra

Is there a site or someone who can help me, im not getting the basic algebra...I need someone or a web site that will help me understand the basics of algebra. PLZ HELP Im in 8th grade

### ALGEBRA HELP #2

Malia is observing the velocity of a cyclist at different times. After two hours, the velocity of the cyclist is 15 km/h. After five hours, the velocity of the cyclist is 12 km/h. Part A: Write an equation in two variables in the standard form that can be used to describe the ...

### Chemistry

Deriving Chem Beer's Law's Equation By comparing the absorbance of each trial solution, Aeq, to the absorbance of the standard solution, Astd, [FeNCS2+]eq can be determined. Two Beer’s Law equations can be written, one for the trial (Aeq = ε[FeNCS2+]eql), one for the ...

### Mathematics

The opposite of -4 is 4.•• -4. -(-(-4)). -|4|. The opposite of -10 is -(-(-10)). -10. 10.•• -|10|.

### Mathematics

A motorist do does the first part of his journey at an average speed of 54km/h. Then he increases the speed to 60km/h for the rest of the journey. If he travels 225km in 4 hours, what is the distance traveled for the rest of his journey? show clear steps.

### Mathematics

Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?

### Mathematics

Find the number of pairs of non-negative integers (n,m), such that 1≤n<m≤100, n∣m^2−1 and m∣n^2−1. Details and assumptions The notation a∣b means a divides b, or b=ka for some integer k.

### mathematics

The population of a town decreases by 4% annually from the number at the end of the previous year. Calculate after how many years it will take the population to reach 21578 if the population had 38756 inhabitants during previous year.

### Discrete Mathematics

A 24 pack of soda costs $8 each and bags of chips cost $6 each. You have $120 to spend and there is a 16 items or fewer fast lane open. How many sodas should you purchase to spend all the money and be able to use that fast lane?

### Mathematics

An open box is made from a square piece of sheet metal 19 inches on a side by cutting identical squares from the corners and turning up the sides. Express the volume of the box, V, as a function of the length of the side of the square cut from each corner, x. A. V(x) = 361x B...

### mathematics

Cand D are two observation posts on the same horizontal ground at the foot A of a vertical tower AB.the tower is 18m due north of D and 24m east of C.the angle of elevation of B from D is 35¡ã.calculate to three s.f the height AB,distance CD,angle of elevation from C,bearing...

### Mathematics

F(x, y) represents a velocity field of a fluid over a surface S defined by z = 6 − 3x − 2y. If the magnitude of the velocity in the direction of the unit normal vector, n̂, on S is 3z⁄√14, compute the flux of F(x, y) over the surface S in the first octant oriented ...

### math

its about phones like att has a monthly fee of $39.99/mo and 450 anytime minutes which are included in the plan and any additional minutes are $0.45/min Sprint-has a monthly fee $34.99/mo and 450 anytime minutes which are included in the plan and any additional minutes are $0....