# Posts by jACK

Total # Posts: 1,834

math
to simplify (2sqrt(b)-sqrt(3a))(2sqrt(b)+sqrt(3a)) answer is -3a+4b. how would you get this?

algebra
The values from a stem-and-leaf plot are:27,27,29,33,38,44,44,44,46,50,58,in numerical order.Please explain how to find the lower quartile for this set. I would take the median of the first five values 27,27,29,33,38;this would make 29 the lower quartile.Is this correct? Is ...

algebra
The following stem-and-leaf plot values shows the average monthly sales commissions (in hundreds of dollars)for a major corporation's nationwide sales group : 27,27,29,33,38,44,44,44,46,50,58. What is the mode of this distribution? Thank You.

algebra
The following stem-and-leaf plot values show the average monthly sales commissions (in hundreds of dollars)for a major co rporation's nationwide sales group: 27,27,29,33,38,44,44,44,46,50,58. What is the mean of the distribution? Please show as much work as possible. Thank...

math
Emma is X months older than molly. If molly is 9 months old, write an expression for emmas age M= Months x= emmas age XM= 9 ?

Math
Oh, that makes a lot more sense thank you

Math
I still don't understand the second one, can you explain it more please? I've gotten to 1-sqrt 3+sqrt 2 but I don't know what to do next, or if it's wrong.

Math
Given that a and b are nonnegative real numbers such that a+2b=60, what is the largest possible value of ab? And If f(x) = x^2 - 3x + 4, find the value of f(sqrt3 - sqrt2). And The median of {20, x, 15, 30, 25} is 0.4 less than the mean. If x is a whole number, what is the sum...

Math
There are two cubes. Their lengths are in the ratio 3:4, what is the simplified ratio between their volumes?

Math
There are two squares. Their lengths at the ratio 2:3, what is the simplified ratio between their areas?

polynomials and zeros
5x^2 + 4x - 2 = 0 How would you solve this by graphing? Do you just draw a graph by finding x and y? The answer is -(2-sqrt14)/5, -(2+sqrt14)/5 There's no way you can just graph it and come up with these numbers by finding the integers of x. How would you do this?

-10x^2 + 7x - 1 = 0 Use factoring to solve

math
dependent or independent taking a quarter out of a bag and then taking another quarter out of the bag without replacing the first quarter

Physics 2
What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?

Physics 2
How many grams of steam at 100C must be mixed with 200g of water at 20C in order for the equilibrium temperature to be 50C?

plane geometry
a clock hangs on the wall. the wall is 71 ft and 9 inches long and 10 ft and f inches high. the night watchman notices that the hands of the clock are pointing in opposite directions and are parallel to one of the diagonals of the wall. what was the exact time

plane geometry
find the radius of the circle circumscribing an isosceles right triangle having an area of 162 sq. cm

circles
standard form - (x-a)^2+(y-b)^2=c^2 can someone simplify this instead then? x^2-2ax+a^2+y^2-2by+b^2-c^2=0? to make it general form

circles
Convert form standard to general form for circle. Circle with center (a,b) and radius c.

trigonometry
A ship started sailing 42.58 degrees west of south at the rate of 5 kph. after 2 hours, ship B started at the same port going 46.33 degrees west of north at the rate of 7 kph. after how many hours will the second ship be exactly north of ship A?

plane geometry
you forgot to write the formula.. lols

plane geometry
a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

trigonometry
a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

trigonometry
A ship started sailing 42.58 degrees west of south at the rate of 15 kph. after 2 hours, ship B started at the same port going 46.33 degrees west of north at the rate of 7 kph. after how many hours will the second ship be exactly north of ship A?

trigonometry
the angle of elevation of the top of the tower from the foot of a flagpole is twice the angle of elevation of the top of the flagpole from the foot of the tower. at the point midway between the tower and the flagpole, the angles of elevation to their tops are complimentary. if...

trigonometry
if the vertex of an isosceles triangle is 80 degrees and the side opposite the vertex measures 12 cm, determine the perimeter of the triangle

algebra
nestor has nickels, dimes, and quarters amounting to \$1.85. if he has twice as many dimes as quarters, and the number of nickels is two less than twice the number of dimes, how many quarters does he have?

algebra
the sum of ages of maria and anna is 35. when maria was two-thirds her present age and anna was three fourths of her present ages, the sum of their ages was 25. how old is maria now?

algebra
if log xy=6 and log x/y=2. solve for x and y

math
sorry how did you get to the answer 25/8?

math
The inside of a trough is shaped like a rectangular solid, 25 feet long, 6 inches wide, and filled with water to a depth of 35 inches. If we wish to raise the depth of the water to 38 inches, how much water must be let into the tank? a. 25/96 cubic foot b. 25/8 cubic feet c. ...

Math
The graph shows the progress of a car which traveled 300 km in 5 hrs. Assuming that its speed remained constant, how far had the car gone after 2 hrs?

Math
Use the theorems that you that you have learned about inscribed angles and intercepted arcs to explain why inscribed quadrilaterals have opposite angles that are supplementary. Answer in 5-6 lines.

Math
Use the theorems that you that you have learned about inscribed angles and intercepted arcs to explain why inscribed quadrilaterals have opposite angles that are supplementary. Answer in 5-6 lines.

Math
@Scott, I want a answer in 5-6 lines. How can I make this answer big?

Math
why inscribed quadrilaterals have opposite angles that are supplementary?

trigonometry
thanks dude, i get the answer..

trigonometry
a 60 meter high building is erected vertically on a hillside. An electric post stands vertically on the hill. An observer at the top the building, find the angle of depressions of the top and the bottom of the electric post to be 30 degrees and 42 degrees respectively. if the ...

trigonometry
thanks dude..

trigonometry
thanks i find a correct answer,but i don't know how to draw.

trigonometry
thanks i find a correct answer

trigonometry
the angle of elevation of a tower at place A south of it is 30degrees and at B west of A and a distance of 50 from it the angle of elevation is 18degrees, determined the height of the tower

math
if the point A has distance "a" to x-axis, and has distance "b" to y-axis, and A is in quadrant 4, then what is the coordinate of A?

Biology
Explain why oxygen consumption varies with body weight.?

Biology
The rate of oxygen uptake by gills depends on the surface area, the number, and the thickness of the lamellae across which oxygen must diffuse. What are two ways to increase the rate of oxygen uptake?

Biology
what is the direction of blood flow in relation to the direction of water flow over the gills

Biology
only 2 percent of the oxygen intake in humans is used by respiratory muscles. do you think the percent of oxygen used by respiratory muscles in a fish is higher or lower than this

World War
What commitments did Canada make as a member of NATO? How did membership in NATO affect Canada's foreign policy?

post world war
what is nato why was it formed what did prime minister mean when he said it is vital to the defense of freedom, to ,maintain military strength on the side of freedom

binomial distribution
Assume that a procedure yields a binomial distribution with a trial repeated n=5n=5 times. Use some form of technology to find the probability distribution given the probability p=0.687 of success on a single trial.

math
Juan is cutting lumber into one half foot lenths.How many one half foot lengths will he get from an 8 foot long piece of lumber?

Social studies
Important animal reasource of great plain Indians

math
A photograph shows 6 foot tall Mr. Jackson standing next to a building. in the photo Mr .Jackson is 2.5 centimeters tall and the building is 10 centimeters tall. what is the actual height of the building

ASL
i dont remember

Physics
Circuit I-----R-------I I-I--I-----R----I---I-----I I I-------R------I I I I I--------/ I--------------I E=15v All R= 7ohom What is the equivalent resistant of the circuit?

Math (Physics)
What is the resistance of a 3.9-m length of copper wire 1.1 mm in diameter? The resistivity of copper is 1.68×10^?8??m. R=______ ? Please Help. I've been at this for hours.

Math(Physics)
How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.5-mm air gap? The charges on the plates are equal and opposite and of magnitude 15 nC . Answer--> PE=_____ J PE = potential energy? I got this wrong twice. [119805....

math
Mr. Gaines is catering his company picnic. He will pay \$18.45 for 3 people to eat the barbecue lunch. At this rate, how many people can Mr. Gaines afford to feed on a budget of \$195.00?

Maths
A square based pyramid, with a perpendicular height of 15cm I'd placed on a table. The weight of the pyramid is 70.56N. The pyramid exerts a pressure of 4900N/m^2 on the table. Work out the volume of the square based pyramid. Thank you so much.

math
The other question is: Consider the points A(1,0,0), B(2,2,2), and C(0,2,1). 1) Show that the Cartesian equation of the plane II(1) containing the triangle ABC is 2x+3y-4z=2. 2) A second plane II(2) is defined by the Cartesian equation II(2): 4x-y-z=4. Find the vector equation...

math
Hi, I was working on my math homework and I was stumbling on these problems. I tried looking at the solutions but my answers were completely off. Here are the ones I'm stuck on: If vectors O(0,0,0), A(6,0,0), B(6,-sqrt(24), sqrt(12)), and C(0,-sqrt(24), sqrt(12)) form a ...

Social Studies
Thank You!

Social Studies
How did Americans disagree over the role of federal and state governments before and during the Civil War? The North wanted the federal government to govern the entire country. The South wanted the states to have much more power. Anything else I could add and am I on track?

Math
i need this answer A.S.A.P what is the volume of pyramid C if the volume of pyramid D is 4608 m cubed and the height of pyramid D is 24 and the height of pyramid C is 12

Math intermediate algebra
The perimeter of a triangle is 33 inches. The sum of the length of the longest side and twice the length of the shortest side is 31 inches. Twice the length of the longest side minus the sum of the lengths of the other sides is 12 inches. Find the lengths of all sides. How do...

Maths
S + C + H = 100 40S +65C + 2H = 3279 How do you solve these type of equations. I'm so confused!

Hey Ms. Sue I feel ya, lots of cheaters on this website I understand, but sadly you can't do anything because from the beginning of time people always find a way to cheat the system and find loop-holes.

math question
A cliff swallow nest is 86 meters above a canyon floor. The elevation of the nest is ?56 meters. What is the elevation of the canyon floor?

math
A rectangular closet is three feet longer than twice the width. The area of the closet is 65 square feet. Find the perimeter of the closet.

ELA
In "How Beaver Stole," what changes to the land does Beaver cause when he runs away with fire?

Math Algebra
@steve what question r u talking about

Math Algebra
hi guys need help with a few questions. 1. Which equation represents the axis of symmetry of the function y = 2x^2+4x-6? A. y= 1 B. x= 1 C. x=3 D x= -3 2. & 3. What are the coordinates of the vertex of the graph of the function - 2. y = -x^2+6x-11 A. (3,-2) B. (3,16) C. (-3,-...

Math
find the measure of the x in the triangle. the other two points are 65 degrees.

chemistry
At 983 torr of pressure, 1.62 grams of a gas dissolves in 2.0L of water at 10'C. What mass of gas will dissolved in 2.0L of water at 1432 torr and 10'C

Statistics
A manufacturer estimates that when x units of a particular commodity are produced each month, the total cost (in dollars) will be C(x) = 1/8x^2+4x+200 and all units can be sold at a price of p(x) = 49 - x dollars per unit. Determine the price that corresponds to the maximum ...

Language Arts
Who has the answer for the whole test

Physics
When a mass is hung from a spring stretches it by 15 cm. What is the period of the oscillations of this system?

Physics
A wheel has a radius of 100 cm. How far (path length) in meters does a point on the circumference travel if the wheel is rotated through angles of (a) 30°, (b) 60 rad, (c) 60 rev, respectively?

Math
Since there are eight students, they can only each get 1/8 of the cake. However, since there is only 3/4 of the cake left, you just multiply the numbers. (1/8)(3/4) = 3/32

Physics
Sarah walks 5 miles 35 degrees north of east, and then decides to walk 6 miles due west. What is her final displacement? I drew it out, used the Pythagorean theorem and ended up with square root -11 which is obviously wrong. I'm really confused as to what to do with the ...

Math
(i) Evaluate integral [ x^3 / (x^2 + 4)^2 ] using trigonometric substitution. (ii) Evaluate integral [ x^3 / (x^2 + 4)^2 ] using regular substitution. (iii) Use a right triangle to check that indeed both answers you obtained in parts (i) and (ii) are the same. I would really ...

Math
Charles is going camping with hisis family. Their campsite is five eighths 5 8 mile away. They walk at a steady speed of 1 and one fourth1 1 4 mi divided by hmi/h. How many minutes will it take them to get to the? campsite?

Physics
Two blocks,each of mass 3.0 kg are connected by a light cord and placed on a horizontal surfabe when a horizontal force of 20 newton is applied on a block an accn of 0.50 metre per second square is produced find(a)tensiom(b)force of friction which is same

Math
In the midsize Station wagon category, the Mercedes Benz E63 AMG S 4matix averages 15.63 L/100km while the Toyota Prius v averages 6.71 L/100km. Convert these fuel economies to miles per gallon.

Physics
A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m?

algebra
Simplify using long division.Show all work. (-72-4x^2+8x^3-36x)/(x-3) Also,please solve (8b^3-6)/(2b-1) I greatly appreciate your help.

Chemistry VERY DIFFICULT
Imagine you have been given a series of materials to react together and the following enthalpy change data has been recorded. Explain the terms exothermic and endothermic, and identify which of the following are exothermic and endothermic reactions. Ensure that you explain ...

algebra
I'm sorry about the carelessness of my first question. The correction should read: y=x^2-4x -32.Use this function to find the x-intercepts by factoring;then show how the value of the discriminant supports your conclusion(s). I'll try to be more careful

algebra
y=x^2 -4x-32. Use this function to describe how the axis of symmetry relates to the x-intercepts. Thanks for your help and time.

algebra
Use this function and find the x-intercepts by factoring; then show how the value of the discriminant supports your conclusion(s). Thank you for all your help.

algebra
Can someone show me the complete solution to this word problem? William,a logistician,needs to route a freight train that is 20 feet at its tallest point and 10 feet at its widest point within 3 days. the most direct path includes a single-track tunnel that needs 24 hour ...

Physics
A piece of metal of volume 250 cetimetre cube floats in water when 85 percent of it's volume is under water.Calculate the upthrust on the metal. 250*85=21250

algebra
Use square roots to solve these equations. Round to the nearest hundredth if necessary. 5x^2 + 536 = 651. Also,problem 2: 3z^2 + 52 = -56

math
Jack has 5 more apples than Jill. Jill has 3 apples. How many apples in total do they have?

Marh
A football team has a net yardage of-26 1/3 yards on a series of plays. The team needs a net yardage of 10 yards to get a first down. How many yards do they have to get on their next play to get a first down?

algebra
How do I completely factor the following expression: w^2 -15 + 54 Thank you.

algebra
Using factoring and zero-product property,please solve the following: 9r^2 -30r +21=-4 Thanks very much.

algebra
Using factoring and zero-product property solve: 4a^2 -10a +6=0 Thank's a lot.

algebra
Please show solution to simplifying this expression: ( 5z-2 )( 5z+2) Thank you.

algebra
How do I simplify (2m-4)(m^2+2m+4)? I appreciate your help,thank you.

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