Saturday

December 10, 2016
Total # Posts: 103,292

**precalculus **

Which of the following shows an inconsistent system of equations? ________________________________________ 4x - 2y = 10 ; y = 2x - 5 3x + 2y = 1 ; 2x - 3y = 1 2x + y = 2 ; y = -2x - 2 3x + 4y = 5 ; 6x + 8y = 10 Is 4x-2y=10 y=2x-5 the correct answer?

*November 29, 2016*

**precalculs**

how do you find all the solutions to the system of equations .2x^2-2x-y=14 .2x-y=-2

*November 29, 2016*

**precalculus **

how do you find all the solutions to the system of equations .x+y=0 .x^3-5x-y=0

*November 29, 2016*

**precalculus**

8. Solve the system of equations shown below. .3/4x-5/2y=-9 .-x+6y=28 x = 21.5, y = 8.25 x = -8, y = 6 x = 8, y = 6 x = -21.5, y = 8.25

*November 29, 2016*

**math**

ervin sells vintage cars. every three months, he manages to sell 13 cars. assuming he sells cars at a constant rate, what is the slope of the line that represents this relationship if time in months is along the x-axis and the number of cars sold is along the y-axis?

*November 28, 2016*

**Physics**

A gun is shot horizontally from a building that is 10 meters high at a velocity of 220 meters/ second: I need to know what Vx is and Vy along with answering Vx after 3 seconds Vy after 3 second. We were given these equations Vy= Vy0-9.8t y= y0+Vy0t-4.9t^2 x=Vxt ,but I'm ...

*November 28, 2016*

**math**

Suppose you want to build a house on the edge of a hill that overlooks a deep valley. what measures could you take to be sure your home will not have problems due to weathering or erosion?

*November 28, 2016*

**Math**

an at display includes two sound-effects speakers. They need to be positioned on the wall so that when you stand midway between the speakers, you are no closer than 7 feet to either speaker. each speaker should be the same distance from the corner. How far from the corner ...

*November 28, 2016*

**Math **

Write an equation in slope-intercept form of the line that passed through (-3,4) and (1,4). I think the answer is y=0/4x+4 Thank you

*November 28, 2016*

**probability**

Rolling a 5 on a fair number cube

*November 28, 2016*

**math**

11 is correct, I checked on a calculator.

*November 28, 2016*

**physics**

3.23x104J / 1.21x104 = 2.66

*November 28, 2016*

**Social Studies**

Thanks

*November 28, 2016*

**Social Studies**

Where can I find a good map of China from the california standards chapter 7 lesson 1-4?

*November 28, 2016*

**Algebra**

y= 3x + 13 2x= y -9

*November 28, 2016*

**Math word problems **

Sally has 108 muffins,which he needs to box up, 6 of which are blueberry, into dozens. How many boxes does he need

*November 28, 2016*

**Math**

How do I write 15 times 3.4 using the distributive property?

*November 28, 2016*

**World History**

How did the Shinto belief system develop in early Japan? A. Clans erected shrines to worship their ancestors. B. Buddhist ideas evolved into Shinto beliefs. C. Warriors built shrines to remember fallen comrades D. Clans honored powerful natural spirits and gods. Is the answer ...

*November 28, 2016*

**precalculus**

Which of the following would be the best first step when solving the following system using the substitution method? • x - y = -4 ; • x + 2y = 5 x = -4 - y x = -4 + y 2y = 5 - x 2y = 5 + x I have solved the equation but I am unsure which is the best first step. x-y=-...

*November 28, 2016*

**precalculus**

Which of the following would be the best first step for solving the system of equations by elimination? • 6.3x + 7.2y = 5.4 • 5.6x + 6.4y = 4.8

*November 28, 2016*

**pre calculus**

A small fast food restaurant invests $4000 to produce a new food item that will sell for $3.50. Each item can be produced for $2.15. How many items must be sold in order to break even? Round to the nearest item.

*November 28, 2016*

**precalculus**

A small fast food restaurant invests $4000 to produce a new food item that will sell for $3.50. Each item can be produced for $2.15. Which of the following systems shows the cost and revenue functions for x items produced and sold?

*November 28, 2016*

**Math**

First, divide 56 by 14.That will give you the cost per each bottle. Then you multiply that cost by 50, to find the cost of the 50 bottles.

*November 28, 2016*

**Math**

If the inverses of two functions are both functions, will the inverse of the sum or difference of the original functions also be a function? Explain your reasoning.

*November 28, 2016*

**Math**

How does one solve this? A= LxW ;w This is exactly how it was written and I heard your supposed divide something but I don't know...

*November 28, 2016*

**Physics**

A 27.9 kg block (m1) is on a horizontal surface, connected to a 6.50 kg block (m2) by a massless string as shown in the figure below. The frictionless pulley has a radius R = 0.090 m and a moment of inertia I=0.060 kgm2. A force F = 192.1 N acts on m1 at an angle theta = 32.1&...

*November 28, 2016*

**maths**

A boy throws a ball vertically upwards with a velocity of 10m/s.What is the velocity of the ball when it is half way up?

*November 28, 2016*

**Math**

Jasmine has taken a quiz she ks on question 16 and has completed 20% of the quiz. How many questions does the quiz have?

*November 27, 2016*

**math**

In a football game, a touchdown with an extra point is worth 7 points and a field goal is worth 3 points. Suppose that in a game the only scoring done by teams are touchdowns please help!!!!

*November 27, 2016*

**pre calculus**

Find all of the solutions of the equation x4-625i=0 and represent the solutions graphically. what is the next step to answer the question? (x^2-25?i)(x^2+25?i) (x-5?i)(x+5?i)(x-5?i i)(x+5?i i) i = 1 cis ?/2 ?i = ?1 cis ?/8

*November 27, 2016*

**precalculus**

use the information to solve the triangle. If two solutions exist, find both solutions can you show how to work this out? A=150°,b=4.8,a=9.4

*November 27, 2016*

**Environmental Science please help**

9 is false not true but I got a 9/10

*November 27, 2016*

**Environmental Science please help**

Number nine is wrong. It should be false

*November 27, 2016*

**math**

If 3 people worked and earned $5554.52 in one day. How much does each person earn if one worked for 5 hours, the other worked 7 and the other worked 8 hours?

*November 27, 2016*

**pre calculus **

How do you use de Moivre's formulas to find ?i?

*November 27, 2016*

**precalculus **

How do you convert <12,13> to polar form?

*November 27, 2016*

**precalcalculus**

use the information to solve the triangle. If two solutions exist, find both solutions. How do you work this out? 1.A=36°, B=98°, c=16 2.a=4,b=8,c=10 3.A=35°,b=8,c=12 4.A=25°,b=28,a=18 5.B=130°,c=10.1,b=5.2 6.A=150°,b=4.8,a=9.4

*November 27, 2016*

**precalculus**

how do you convert to polar form?

*November 27, 2016*

**Physics **

A brick of mass 2kg just begins to slide down an inclined plane at an angle of 45 degree with horizontal.what will be the force of friction

*November 27, 2016*

**Math**

find the velocity and direction of flight of a plane that is headed at 126 degrees with a ground speed of 215 mph in a 34 mi wind from south 36 degrees west

*November 27, 2016*

**science**

What is the average speed of a race cow that travels 60 meters in 20 seconds?

*November 26, 2016*

**Instructional Materials**

exam 026039RR

*November 26, 2016*

**Math**

A cooperation must appoint a president, CEO, COO,and a CFO. It must also appoint a planning committee with 3 different members. There are 15 candidates and officers can also serve on the planning committee. How many different ways can the officers be appointed? How many ways ...

*November 26, 2016*

**Math grade7**

Anybody answer those

*November 26, 2016*

**pre calculus **

find (a)2v+u, (b)u-3v), and (c)5u-v. 1.u=i-j, v=6i+9j 2.u=2i+3j, v=-i-2j

*November 26, 2016*

**pre calculus**

find (a)2v+u, (b)u-3v), and (c)5u-v u=<-2,-3> v=<-1,-10>

*November 26, 2016*

**pre calculus**

Forces with magnitudes of 250 pounds and 130pounds act on an object at angles 45degrees and -60degrees respectively with the positive axis. Find the direction and magnitude of the resultant of these forces.

*November 26, 2016*

**pre calculus**

Find the component form and magnitude of the vector w that has initial point(-8,-12) and terminal point (4,1)

*November 26, 2016*

**pre calculus**

A triangular parcel of land has borders of lengths 55 meters, 85 meters, and 100 meters. Find the area of the parcel of land.

*November 26, 2016*

**pre calculus**

find (a)2v+u, (b)u-3v, and (c)5u-v u=<0,-4>, v=<-2,-8>

*November 26, 2016*

**pre calculus **

Write the complex number 100(cos240°+ i sin240°) in standard form.

*November 26, 2016*

**pre calculus**

Write the complex number z=-2+2i in trigonometric form.

*November 26, 2016*

**math**

you want to buy three books that are on sale at 20% off. the original prices of the books are $2.50, $4.95, and $6.00. How much will you save?

*November 26, 2016*

**pre calculus**

ea + bi = ea(cos b + i sin b) This formula gives rise to the equation e?i + 1 = 0. . Show how Euler’s formula can be used to derive this equation.

*November 26, 2016*

**pre calculus**

how do you use e^a+bi = e^(cos b + i sin b) to derive the equation e?i + 1 = 0

*November 26, 2016*

**math**

If f is a function such that the limit as x approaches a of the quotient of the quantity f of x minus f of a and the quantity x minus a equals 7, then which of the following statements must be true?

*November 26, 2016*

**math**

If f(?1) = ?3 and f prime of x equals the quotient of 4 times x squared and the quantity x cubed plus 3 , which of the following is the best approximation for f(–1.1) using local linearization

*November 26, 2016*

**math**

Which of the following is the best linear approximation for f(x) = sin(x) near x = ? seconds?

*November 26, 2016*

**Physics**

If the angle of incidence is 30degree and refractive index is 2 find the angle of refraction.find whether the medium is denser or rarer

*November 26, 2016*

**.**

This is what I got I was just unsure if it was right, thank you.

*November 26, 2016*

**Maths help asap please**

What is the smallest integer of c that satisfies the inequality of 3c-7 > 5c+4 Many thanks.

*November 26, 2016*

**math**

Thr sum of three numbers is 33.The first no.is twice the third no.The second no.is one more than the first.Determine the nos.

*November 26, 2016*

**Math**

The sum of two nos is 40, the smaller no is 6 less than the larger no, Find the nos

*November 26, 2016*

**Physics**

I omega = constant before I suppose we could model the device as a flat disk I = .5 M r^2 = .5(118)(1.8)^2 I omega = I (.47*2 pi) now after Inew = I + 20(1.8)^2 so I omega = Inew Omeganew .5(118)(1.8)^2(.47*2 pi)=Inew* Omeganew that will give omega new in radians/sec divide by...

*November 25, 2016*

**Physics**

A playground merry–go–round has a mass of 118 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.470 rev/s. What is its angular velocity after a 20.0–kg child gets onto it by grabbing its outer edge? The child is initially at rest.

*November 25, 2016*

**chemistry **

if i have an isopropyl group and the a carbon with a methyl group on it, will the methyl protons be split by the isopropyl protons? (CH3)2---C-C-(CH3)

*November 25, 2016*

**Physics**

(1/2) m v^2 = m g h

*November 25, 2016*

**Physics **

Jacob is a little too excited about finishing his homework and throws his hands up in the to shout, "I'm done!" He accidentally drops his 2.3 kg pencil straight down from a height of 2.12 m. what will be the kinetic energy of the pencil just before it hits the ...

*November 25, 2016*

**Physics **

Jacob is working on his physics portfolio and stands on a 0.45m high step. If Jacob’s mass is 103kg, what is his potential energy while on top of the step? Givens: Unknown: Equation: Substitute: Solve:

*November 25, 2016*

**biochemistry **

how many grams each of tris and tris HCl are needed to make up 500ml of 1m tris buffer with a PH of 8.0. pka of tris =8.3 mwt of tris =121 mwt of tris HCl =175

*November 25, 2016*

**chemistry NMR helpppp**

really really need some help, been stuck on this for toooo long. Some Data: "A" triplet for 3H (2 neighbors) "B" quartet for 2H (3 neighbors) "C" singlet for 3H (no neighbors) "D" singlet for 2H (no neighbors) Alright here is what i have...

*November 25, 2016*

**Math **

The difference between a number and the number that formed by reversing the digits is 36.if the digit at the tens place is twice the digit at the unit's place.find the number

*November 25, 2016*

**accounting**

A debit increases the balance in all of the following accounts except for which one?

*November 24, 2016*

**math**

A bus contain 42 passengers the number of male is 5 times the number of female how many famale in the bus

*November 24, 2016*

**Math**

How do you multiply 12 times 13 step by step step

*November 24, 2016*

**Chemisty**

I guess that 22.909 L

*November 23, 2016*

**wirting**

how to use APA citing on the following phase "The movie Silver Linings Playbook"

*November 23, 2016*

**simplex method **

Maximize P=60x+50y. ? ?x+y?80 ? ?5x+10y?560 ? ?50x+20y?1600 ? ?x?0 ? ?y?0 ? ? ? ? ? ? ? Use the simplex method to solve the problem. Use s, t, and u as your slack variables for the first, second, and third inequalities respectively. Use the final simplex tableau to identify ...

*November 23, 2016*

**Calculus**

An object at the origin at time t= 0 has velocity measured in meters per second, v(t) = t/30 if 0 <= t <= 90 = 3 if 90 < t <= 108 = 9-(t/30) if 180 < t When, if ever, does the object return to the origin? t=

*November 23, 2016*

**Further mathematics**

Given that x squared + y squared = 5xy,show that; (a) 2log(x+y\?7)=log x + log y. (b). Log ( x- y\?3) = 1\2( log x + log y)

*November 23, 2016*

**pre calculus **

can you please explain what steps you take to find ||u||2 when u: <-1,7> v: <6,4>?

*November 23, 2016*

**pre calculus**

Can you explain how to find (u • v)(u + v) when u <-1, 7> and v <4, -3>

*November 23, 2016*

**Calculus**

Find all values of c that satisfy the Mean Value Theorem for integrals for f(x)= x^{2} on the interval [-3, 3]

*November 23, 2016*

**The Graphical Method**

Appericate it !

*November 23, 2016*

**Calculus**

If f(x) = integrate t^2 from x to x^2, then f'(x)= f'(-1)= Please help! I have no idea how to approach this.

*November 23, 2016*

**mathematics**

novel. x=5.

*November 23, 2016*

**mathematics**

a survey of reading habits of 100 students showed that 30 read both comics and novels. 10 read neither comics nor novels and twice as many students read comics as read novels. 1. illustrate the information on a Venn diagram. 2. how many students read only novels. 3. how many ...

*November 23, 2016*

**calculus**

how do you work out what ||u||2 is when you are given u:<-1,7> and v:<6,4>

*November 23, 2016*

**pre calculus**

Given: u <-1, 7> and v <4, -3> Find: (u • v)(u + v) ________________________________________ <25, 100> <-25, 100> <-75, -100> <75, -100>

*November 23, 2016*

**pre calculus**

Use the following vectors to answer the question. u: <-1,7> v: <6,4> What is the projection of u onto v?

*November 23, 2016*

**pre calculus**

Use the following vectors to answer the question. u: <-1,7> v: <6,4> What is ||v||2?

*November 23, 2016*

**pre calculus**

Use the following vectors to answer the question. u: <-1,7> v: <6,4> What is ||u||2?

*November 23, 2016*

**algebra~help me**

18^(4-4y)=54(sqrt(2))^(3y-2) step plz help me

*November 23, 2016*

**physics**

Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.

*November 23, 2016*

**physics**

Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.

*November 23, 2016*

**Economics(pls Help)**

Zoe Goggles is a deep sea underwater photographer. Her camera and lenses are valued at $4,000. There is a chance of 1/20 that she will lose her equipment on a dive over the course of the year. Her wealth, including the value of her equipment, is $30,000. Zoe’s utility ...

*November 23, 2016*

**math **

the sum of two no is 50 .the smaller no is two third of the greater no.. find the no.

*November 22, 2016*