Wednesday
July 29, 2015

Posts by mark


Total # Posts: 1,349

Algebra
If a bottle and a cork cost $2.00, and the bottle is $1.00 more than the cork, what is the cost of each?
July 22, 2015

GT
A GAS EXPANDS IN VOLUME FROM 26.7 ML TO 89.3 ML AT CONSTANTTEMPERATURE. CALCULATE THE WORK DONE (IN JOULES) IF THE GASEXPANDS (A) AGAINST A VACUUM,(B) AGAINST A CONSTANT PRESSUREOF 1.5 ATM, AND (C) AGAINST A CONSTANT PRESSURE OF 2.8 ATM.
July 20, 2015

Physics
A 2.50 kg fireworks shell is fired straight up from a mortar intending to reach 110m. How much downward force is created to propel that shell upwards to it's intended target?
July 6, 2015

Physics
Calculate the initial velocity for each using the average time of fligh up, the acceleration of gravity and the initial velocity. The average time up for A is 3.18s and for B is 1.87s and using the formula t=Vo Sin(theta)/g. Please and thank you!!!
June 28, 2015

Physics
Calculate the initial velocity for each using the average time of fligh up, the acceleration of gravity and the initial velocity. The average time up for A is 3.18s and for B is 1.87s and using the formula t=Vo Sin(theta)/g. Please and thank you!!!
June 28, 2015

Geometry
The base of a right prism is a rhombus with a side of 10 cm and an altitude of 9.6 cm. Find the diagonals of the prism if the altitude of the prism is 12 cm.
June 24, 2015

Physics
The speed of a projectile when it reaches its maximum height is 0.42 times its speed when it is at half its maximum height. What is the initial projection angle of the projectile?
June 24, 2015

Physics
thanks
June 9, 2015

Physics
Could you specify the 120/200? is it just Delta(t)= 120/200 ? i want to set it up right.
June 9, 2015

Physics
would it be ~ Delta(y)= 1/2(9.8m/s^2)(.6s)^2 = 1.764 so it would be about 5 feet off? That's quite a miss..
June 9, 2015

Physics
A pistol is fired horizontally toward a target 120 m away but at the same height. The bullet's velocity is 200 m/s. How long does it take the bullet to get to the target? How far below the target does the bullet hit? please explain why you used the formula and how you got ...
June 9, 2015

Chemistry
What are some of the distinctive properties of gases with respect to: density, volume, shape?
June 7, 2015

Physics
A stone is shot upward with a speed of 24.4 m/s from a tower and lands at the base of the tower with a speed of 44.0 m/s. How long does it take?
June 6, 2015

US History
What were the original goals and purposes of the containment policy in 1946? How did the policy change its meaning over time?
June 4, 2015

Social Studies
i need the answers plz
June 3, 2015

Chemistry
Will 1 L of 1 M NaCl contain more chloride ions than 0.5 L of 1 M MgCl2 explain. One liter of 1 M NaCl contains________ mole(s) of NaCl, therefore_______ mole(s) of chloride ions. 0.5 L of 1 M MgCl2 contains__________ mole(s) of MgCl2, therefore_________ mole(s) of chloride ions.
June 3, 2015

Chemistry
(a) How many grams of KNO3 are needed to make 430 mL of a solution that is to contain 2.9 mg/mL of potassium ion?
June 3, 2015

Physics
Wow, Thanks Damon. Got it!
June 2, 2015

Physics
thanks Damon. I can't seem to figure out where to go next. Substitution seems like the obvious choice, but I don't know which sum to begin with.
June 2, 2015

Physics
Vector C has a magnitude 25.8 m and is in the direction of the negative y-axis. Vectors A and B are at angles α = 41.9° and β = 25.2° up from the x-axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?
June 2, 2015

geometry
How did you solve it?
May 31, 2015

geometry
One endpoint of a line segment is (8, −1). The point (5, −2) is one-third of the way from that endpoint to the other endpoint. Find the other endpoint.
May 31, 2015

geometry
Name a point that is between 50 and 60 units away from (7,-2) and state the distance between the two points.
May 31, 2015

geometry
find the equation of the line that describes all points equidistant from the points (1, 2) and (4, 5).
May 29, 2015

college geometry
A rectangle ABCD has three of its vertices at A(2, 1), B(6, 1), and C(6, 3). Find the fourth vertex D and the area of rectangle ABCD.
May 29, 2015

college geometry
M(2.1, 5.7) is the midpoint of , in which A is the point (1.7, 2.3). Find the coordinates of B.
May 29, 2015

college geometry
Points A and B have symmetry with respect to point C. Find the coordinates of C given the points: a) A(3, 4) and B(5, 1) c) A(5, 3) and B(2, 1) b) A(0, 2) and B(0, 6) d) A(2a, 0) and B(0, 2b)
May 28, 2015

college geometry
Points A and B have symmetry with respect to the origin O. Find the coordinates of B if A is the point: a) (3, 4) c) (a, 0) b) (0, 2) d) (b, c)
May 28, 2015

college geometry
Points A and B have symmetry with respect to the origin O. Find the coordinates of B if A is the point: a) (3, 4) c) (a, 0) b) (0, 2) d) (b, c)
May 28, 2015

college geometry
10. Find the midpoint of the line segment that joins each pair of points: a) (Ϫ3, Ϫ7) and (2, 5) c) (Ϫa, Ϫb) and (a, b) b) (0, 0) and (Ϫ2, 6) d) (2a, 2b) and (2c, 2d)
May 28, 2015

S.S. Please help!
theyre both wrong
May 28, 2015

college geometry
If the distance between (b, 3) and (7, 3) is 3.5 units, find all possible values of b.
May 27, 2015

college chemistry
How many calories are required to change 259 g of ice at 0 °C to steam at 100 °C?
May 26, 2015

Chemistry
Mount McKinley in Alaska is the tallest peak in North America with a summit at 20,320 ft, or 6194 m. It is also known as Denali, meaning "the high one" in the native Koyukon Athabaskan language. The average atmospheric pressure at the top of Denali is approximately ...
May 26, 2015

Chemistry
If 125 g of ice at 0.0°C is added to 1.95 L of water at 90 °C, what is the final temperature of the mixture?
May 26, 2015

Chemistry
How many joules of energy are needed to change 114 g of water at 16.5°C to steam at 100°C?
May 26, 2015

Chemistry
Upon heating 134 g MgSO4 · 7 H2O: (a) how many grams of water can be obtained? (b) how many grams of anhydrous compound can be obtained?
May 26, 2015

math
thank you,Ms.Sue
May 24, 2015

math
will it be set up like 3 x 21 x 3 =189
May 24, 2015

math
you can get 3 toppings with 1 cheese and 1 crust
May 24, 2015

math
how many pizza choices can you get with 3 crusts,7 toppings and 3 cheeses
May 24, 2015

Physics
I can't figure out how to do this. design an experiment you could construct that might measure the amount of work it takes to change the volume of a gas in a piston. What materials would you use? What would you measure? What results would you expect? What if the results ...
May 18, 2015

Chemistry (Acids and Bases)
Okay thank you. I didn't realize they were the same. But in "What is the pH of a 0.300 molar NaOH solution?" -log(.3)=.523 is incorrect. Why?
May 10, 2015

Chemistry (Acids and Bases)
What is the pH of a 0.400 molar HCl solution? I did -log(.4)=.398. That seems too low. I think I need to find the molarity (M) of the solution, but I can't find it with the given information.
May 10, 2015

Science
There are 2 high and 2 low tides each day. Why do this many tides occur each day?
May 3, 2015

chemistry
A 32.5 g sample of K2SO4 is dissolved in a quantity of water and stirred well. A 40.00 mL sample of the solution is evaporated to dryness and leaves behind 5.00 g of solid K2SO4.what is the molarity. Calculate molar masses of solutes to .01 grams
April 26, 2015

math
3ft
April 14, 2015

math
Five friends shared 2 packs of paper equally. What fraction of a pack of paper did each friend get? I think 2/5
March 30, 2015

math
Some functions that aren't invertible can be made invertible by restricting their domains. For example, the function x^2 is invertible if we restrict x to the interval [0,\inf), or to any subset of that interval. In that case, the inverse function is-\sqrt x. (We could ...
March 27, 2015

Algebra
Some functions that aren't invertible can be made invertible by restricting their domains. For example, the function x^2 is invertible if we restrict x to the interval [0,inf), or to any subset of that interval. In that case, the inverse function is \sqrt x. (We could also...
March 26, 2015

Geometry
The length of a rectangle is 3x+10 feet and its width is x+12 feet. If the perimeter of the rectangle is 76 feet, how many square feet are in the area of the rectangle?
March 26, 2015

physics
A 4 kg projectile has 1400 J of kinetic energy when it leaves the ground. If it has 120 J of kinetic energy at its highest point, how high did it travel?
March 17, 2015

Stats
A random sample obtained from a population has a mean of µ=100 and a standard deviation of ó = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n...
March 13, 2015

Art
@Reed, I have this question, it's not monet, it's manet.
March 11, 2015

Statistics
what is the cost of a dinner when there is a 0 rating when y hat=1.6+2.9x
March 2, 2015

Chem
Using the Absorbance (0.455) of your Unknown SCN- solution and the slope (3163.9) from your Calibration Curve, calculate the concentration of SCN- in the solution created from 5.0 mL 0.200 M Fe(NO3)3, 40.0 mL H2O and 5.0 mL SCN-. How would I calculate?
March 1, 2015

Math
12
March 1, 2015

Physics
62m of skid marks and coefficient of .75, how fast was the car going?
February 22, 2015

calculus 3
A golf ball is driven down a horizontal fairway with an initial speed of 55m/s at an initial angle of 25 degrees. (Assume the tee from which the ball is hit is of negligible height). a). how far does the ball travel horizontally b). when does the ball land? c). what is the max...
February 17, 2015

physics
A speeder passes a parked police car at a constant speed of 20.1 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.65 m/s How much time passes before the speeder is overtaken by the police car? Answer in units of s
February 5, 2015

math
What is the area of the largest rectangle with lower base on the x-axis and upper vertices on the curve y = 12 - x^2?
February 3, 2015

math
What are the two positive integers whose sum is 200 and whose product is a maximum?
February 3, 2015

math
Find the absolute maximum of the function f(x)=2x+1, where -2<x<0 (-x^2)+1, where x>0
February 3, 2015

math
Which one of the following statements is true? If f is continuous on (a, b), then f attains an absolute maximum value and f attains an absolute minimum inside the interval (a, b). If f '(x) > 0 on the interval (a, b), then f is decreasing on the interval (a,b) If f and ...
February 3, 2015

math
Find the x-coordinate of the point(s) of inflection on the graph of y = x^3 - 12x^2 - 5.
February 3, 2015

physics
An aircraft has a lift off speed of 130 km/h. What minimum uniform acceleration does this require if the aircraft is to be airborne after a takeoff run of 350 m? Answer in units of m/s2
January 29, 2015

math
Charlene is feeling a box planter with soil each bag of soil contains enough to fill 500 cubic inches at the base of the blocks planter is a 9 inch square and the sides are 18 inches tall how many bags of soil for growing need
January 19, 2015

Math
My math problem is combining like terms then simply. 3 3 6b - 2b + 2b + 2b -b Answer is (b)
January 13, 2015

Math
Which of the following ordered pairs is a solution to the inequality y less than or equal to -2x + 8? a. (0, -4)<<<< b. (5, -1) c. (7, 0) d. (9, 1)
December 29, 2014

Math-Damon can you help me?
Do you know what kind of formula I could use to solve this?
December 21, 2014

Math-How do I do this problem?
An inverted conical tank (with vertex down) is 14 feet across the top and 24 feet deep. If water is flowing in at a rate of 12 ft3/min, find the rate of change of the depth of the water when the water is 10 feet deep.
December 21, 2014

Statistical Reasoning
The size of an e-mail file is stated as 210 KB, but the file size is actually 220.5KB. What is the absolute error?
December 14, 2014

Sixth Grade Math
Thank you for explaining.
December 11, 2014

Sixth Grade Math
Leland wants to paint a portrait for his parents using a photograph of them that is 5 inches wide by 8 inches high. He wants the portrait to be proportional to the photograph and 42 inches high. Which proportion can Leland use to find w, the width he needs to use to make the ...
December 11, 2014

Math
__ 0.63 _ 0.63 0.675 _ 0.7 The answer choices have a line above the numbers. I don't understand.
December 11, 2014

law
•What are the similarities and differences in the realities of plea-bargaining between the crime control model and the due process model
December 9, 2014

Math
Find all solutions to the equation sqrt(2-3x)= 9. Express your answer as a common fraction. I squared both sides and I got 4-9z^2=81 and then -9z^2=77 then I divided both sides by -9 and now I am stuck, I know I can square root both sides. But I think something went wrong.
December 3, 2014

Math
The square root of h is greater than 10/3 and less than 24/5. How many integer values of h satisfy this condition? I think the first step would be to square each fraction so 100/9 and 576/25 and then see which whole numbers are between. Am I on the right track?
December 3, 2014

math
The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune?
December 3, 2014

math
9 of the 30 children in a class had brown eyes what fraction of the children have brown eyes
November 26, 2014

chem
Thank you! Now question 5 makes sense.
November 26, 2014

chem
Ascorbic acid is a diprotic which donates 2 H+. Autocorrect is the worst
November 26, 2014

chem
I meant to say ascorbic acid is a diuretic which donates 2 H+
November 26, 2014

chem
I titrated a 250mg tablet to see if it really had 250mg of scorbutic acid (H2C6O6) a diuretic acid, in it. I took a 250mg tablet, grounded it up and found it took 35.87ml of .0505 M NaOH to neutralize it 1. How many moles of NaOH is it? 35.87ml NaOh(1L/1000ml) (.0505M/1L)= ....
November 26, 2014

poetry ! help
I'm confused on how to write a sonnet poem. ( I searched for some examples but there just way to confusing) any examples? Thanks:)
November 24, 2014

Physics
At the start of a trip, a driver adjusts the absolute pressure in her tires to be 2.84 ✕ 105 Pa when the outdoor temperature is 281 K. At the end of the trip she measures the pressure to be 2.95 ✕ 105 Pa. Ignoring the expansion of the tires, find the air ...
November 13, 2014

Math
Thank You Very Much DonHo
November 10, 2014

Math
If Charlie is 6 1/3 ft tall, Dan is 6 5/12 ft tall and Mark is 6 1/6 ft tall, who is the tallest? I say Dan is the tallest, am I right? Thank You for any help you can give me on this.
November 10, 2014

Math
Thank You
November 10, 2014

statistics
The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...
October 20, 2014

science
can you tell me the relationship between water treatment and geckos
October 17, 2014

physics
the volume v of a sphere of radius r is given by v=4/3pie r^3 what is the fractional change in v for a fractional change in r
September 25, 2014

6th Grade Math
Marianne buys 16 bags of potting soil that comes in 5/8 -pound bags. A. How many pounds of potting does Marianne buy? 10 B. If Marianne’s father calls and says he needs 13 pounds of potting soil, will 4 more bags be enough to cover the extra soil needed? Is 10 the correct...
September 16, 2014

Solve. W rite each answer in simplest form.
Thank you Ms. Sue!
September 16, 2014

Math
You complete 3 centimeters on your necklace in an hour. Each hour after the first,you triple the length of the necklace. Write an expression using exponents for the length of the necklace after 3 hours.Then find the length.
September 16, 2014

Finance/Economics
You can invest your money in a taxable corporate bond paying 10% interest or a tax-free municipal bond paying 7% interest. Which would pay the higher after tax interest if you are in the 28% tax bracket?
September 16, 2014

ccs trigo
A pilot is flying at a heading of 96° at 225 miles per hour wind is blowing from the south west at a heading of 37° find the ground speed and courses of the plane
September 14, 2014

trig
bike tires are 22 inches in diameter and has an angular speed of 5 miles per second, how fast is the bike traveling in mph
August 15, 2014

trigo
180
August 14, 2014

algebra
A new cruise ship line has launched 3 new ship: the pacific, the Caribbean and the island. The Caribbean has 37 more deluxe staterooms than the pacific. the island has 38 fewer deluxe staterooms than twice the number of deluxe stateroom on the pacific. Find the number of ...
August 1, 2014

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