Saturday
April 30, 2016

Posts by Mark

Total # Posts: 1,518

Trigonometry
I need help graphing y=csc(x+pi/4) on the interval -pi/2<x<3pi/2
April 28, 2016

Physics! Volume!! HELP
An object hanging on a scale reads 24.0g when submerged in water, but 48.0 g when submerged in oil (specific gravity 0.80) Find the density of the object.
April 27, 2016

Math
The number of bacteria in a certain culture T hours from now grows according to A=800(3)^t what will the count be in 3.12 hours from now?
April 25, 2016

PHYSICS HELP! ROLLING MOTION
The five masses below all have the same radius and a cylindrically symmetric mass distribution. They start to roll down an inclined plane, starting from rest, at the same time and from the same height. Give their order of arrival at the bottom. (a) Icm=935 g*cm2, M = 44g (b) ...
April 25, 2016

PHYSICS! HELIUM BALLON
Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 277.0 kg. What must be the minimum diameter of the spherical balloon?
April 25, 2016

my son's math help please
Each week Susie washes dishes three nights,washes clothes one night,empties trash cans two nights,and cook supper one night.If her Aunt Nancy stopped by randomly one night,what are the chances that Susie would be cooking that night!
April 18, 2016

help my son's math
Jamie won the spelling bee.she completed 8 more rounds than Antonio,who completed three times as many rounds as beth.If beth completed 6 rounds, how many rounds did jamie completed?
April 11, 2016

Algebra
Okay, so I got 60/17 = 3.529 hours?
April 7, 2016

Algebra
Sue, an experienced shipping clerk, can fill a certain order in 5 hours. Jim, a new clerk, needs 12 hours to do the same job. Working together, how long will it take them to fill the order?
April 7, 2016

Chemistry
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus. Write a balanced nuclear equation for alpha emission. Write a balanced nuclear equation for carbon-14 emission.
April 7, 2016

Algebra
Thank you Steve.
April 7, 2016

Algebra
I posted the wrong problem for my work provided, although I am struggling to answer both. The correct problem for my work provided is as follows. A car Traveled 132mi at a certain speed. If the speed had been 11mph faster, the trip could have been made in 2hr less time. Find ...
April 7, 2016

Algebra
Person A can paint the neighbor's house 2 times as fast as Person B. The year A and B worked together, it took them 5 days. How long would it take each to paint the house? So, i know how to setup the problem, but i'm not sure what steps I need to take to solve. This is...
April 7, 2016

physics
The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15 m? 1.0m x 1.0m distance.
April 5, 2016

physics
A 1400-N uniform boom at ϕ = 70.0° to the horizontal is supported by a cable at an angle θ = 20.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2250 N hangs from its top. (a) Find the tension ...
April 5, 2016

Math HELP!
For how many integers x does a triangle with side lengths 10,29 and x have all its angles acute. how do I know which side is the hypotenuse or does it not matter? Please give me an explanation.
April 4, 2016

Math HELP!
For how many integers x does a triangle with side lengths 10.29 and x have all its angles acute. how do I know which side is the hypotenuse or does it not matter? Please give me an explanation.
April 4, 2016

Science
Refracting telescopes use lenses. Reflecting telescopes use mirrors. However, both types of telescopes have something in common. How are both types of telescopes similar? A)They both magnify tiny nearby objects. B)They both reflect light that enters the telescope. C)They both ...
April 4, 2016

Science
Is it B?
April 4, 2016

Algebra
Diane Gray and Lucy Hoang together can prepare a crawfish boil for a lagre party in 4 hours. Lucy alone can complete the job in 2 hours less time than Diane alone. Find the time in which each person can prepare the crawfish boil alone. Round to the nearest tenth of an hour.
April 4, 2016

help my son's math
Hill crest public school held its annual skating party and 3/4 of the 480 students came.Of the students who came,1/5 brought skates from home. How many students rented skates?
March 31, 2016

US History
According to Black Elk, what atrocities took place at Wounded Knee? How did President Harrison describe these atrocities? Whom did Black Elk blame for the Wounded Knee Massacre? Whom did Harrison blame? According to President Harrison, what was the future of Native Americans? ...
March 30, 2016

US History
Discuss the different approaches of the federal government toward the Plains Indians
March 30, 2016

algebra
A 3 by 5 inch picture is put into frame with a mat that has width x. Draw picture inside the frame, write the expression of the width and length of the frame AND the picture together. If the total area of the frame with the picture is 35 in ^2, find the width and length of the...
March 30, 2016

math
The length of a rectangle is four more than five times its width. Its perimeter is 92 inches. Find its dimensions​ length and​ width.
March 9, 2016

algebra
The length of a rectangle is two more than four times its width. Its perimeter is 54 inches. Find its dimensions​ length and​ width.
March 9, 2016

algebra 1
What is -16x^2+96x+200?
March 6, 2016

algebra 1
What are two methods of solving 4x^2+16x+9?
March 6, 2016

physics
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. (a) If a car traveling 21.0 m/s stops uniformly in 1.20 m, how long does the collision last? s (b) What is the magnitude of the average force on the ...
March 3, 2016

Math
1) a) Decide if (q  ( p~ q))~ p is a tautology using propositional equivalence and the laws of logic. b) Prove that the following argument is valid: q q r p r p ~ _________ ~    c) Replace p, q and r in 1b) by statements and ...
March 3, 2016

Math
A bag contains 5 red and 4 green discs , three discs are randomly drawn from a bag what is the probability at least 1 is red and the probability at most one is green?
March 3, 2016

physics
A block of mass m = 5.90 kg is released from rest from point circled A and slides on the frictionless track shown in the figure below. (Assume ha = 7.30 m.) point b is 3.20 m and point c is 2.00m. (a) Determine the block's speed at points circled B and circled C. point ...
March 3, 2016

English
You are assigned to write an essay which must maintain the indicative mood throughout. Which of the choices below would need to be removed or revised? A) Have you ever wished for anything so badly that it hurt not to have it? B) I often walk down the street near my house, ...
February 24, 2016

English
okay I got it I think my final answer is B.
February 23, 2016

English
No not a its D.
February 23, 2016

English
A ?
February 23, 2016

English
Which sentence uses an infinitive as a noun? A) The best movie to watch is coming on TV tonight at 9:00. B) Phil wanted to play video games, but he finished his homework first. C) The cheerleaders traveled to the away games to cheer for the football team. D) Rachel is the ...
February 23, 2016

math
What is the relationship among the numbers and symbols in the expression (14 – 4) ÷ 2? Choose all answers that are correct. A. The difference between 14 and 4 is doubled. B. The difference between 14 and 4 is split into 2 parts. C. The expression has a value equal ...
February 22, 2016

science1002
how many moles are present in 25ml of 0.1m of na2co3
February 21, 2016

physics
A 4.00 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, as in the figure below. The block accelerates to the right at 6.00 m/s2. Determine the coefficient of kinetic friction between block and ...
February 21, 2016

physics
7.–/3 points SerCP9 4.P.063.My Notes Question Part Points Submissions Used A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.355. (a) When the truck accelerates forward, what force accelerates the box? the ...
February 21, 2016

physics
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.0 m/s. Five seconds later, its speed is 5.50 m/s. (a) What is its average acceleration? m/s2 (b) What is the average value of the coefficient of kinetic friction between puck and ice? (c) How far does ...
February 21, 2016

trigonometry
I need help solving this problem. Question: At what points will the line y=-x intersect the unit circle x2+y2=1?
February 14, 2016

maths
before lunch time abigal and teresa each read some pages from different books abigal read 5 or one fifth of the pages in her book teresa read 6 or one sixth of the pages in her book whose had more pages how many more pages
February 11, 2016

Math
A is 2 years older than B. The sum of their ages is 24. How old is A and how old is B?
February 10, 2016

Math
the question is "Joe rode his bike over a piece of gum. Joe continued riding his bike at a constant rate. At time t=1.25 seconds the gum was at a maximum height above the ground and 1 second later the gum was at a minimum. If the wheel diameter is 68cm find a ...
February 7, 2016

physic
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.50 m/s at an angle of 15.0° below the horizontal. It strikes the ground 3.00 s later. (a) How far horizontally from the base of the building does the ball strike the ...
February 3, 2016

physic
A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)
February 3, 2016

physic
A ball is thrown straight upward and returns to the thrower's hand after 2.00 s in the air. A second ball thrown at an angle of 40.0° with the horizontal reaches the same maximum height as the first ball. (a) At what speed was the first ball thrown? m/s (b) At what ...
February 3, 2016

ELA
umm not sure
February 2, 2016

ELA
Take this kiss upon the brow! And, in parting from you now, Thus much let me avow — You are not wrong, who deem That my days have been a dream; Yet if hope has flown away In a night, or in a day, In a vision, or in none, Is it therefore the less gone? All that we see or ...
February 2, 2016

English
Take this kiss upon the brow! And, in parting from you now, Thus much let me avow — You are not wrong, who deem That my days have been a dream; Yet if hope has flown away In a night, or in a day, In a vision, or in none, Is it therefore the less gone? All that we see or ...
February 2, 2016

math
A 26 meter guy wire is attached to an upright pole 24 meters from the ground. How far from the pole must the wire be anchored in the ground?
January 28, 2016

Math (can you provide me with the working and ans?
A rectangular tank 28cm long and 18cm wide was filled with water to a dept of 7cm. When 12 marbles were added the level rose to 12cm. Find the average volume of the 12 marbles.
January 28, 2016

Math
The answer is 120 then I divide by 3 and get 40
January 25, 2016

Math
Can someone explain or show me how to do this problem: Mr. Cafagna wants a fence around the rectangular field that measures 24 ft by 36 ft. How many yards of fencing does he need?
January 25, 2016

Math
The answer is 21pt
January 25, 2016

Math
Can you show or help me with this problem: Aquaman drinks 48 ounces of water a day. How many pints of water is that a week? I know that 1 Cup=8oz and 1 pt=2 cups. What do I do?
January 25, 2016

Precalculus
Considering the line segment joining A(-5, 2) and B(7, 8), find an equation, in the form of Ax+By=C, that expressed the fact that a point P(x, y) is equidistant from A and from B. How would I go about even attempting this problem?
January 20, 2016

Math
Simplify the following, using only positive exponents. Do not evaluate. Exponetial functions c) f^3 g−^1/f^2 g^3 d) (k^−2m^3n)×(kmn^5)÷(k^− 1m^2 n)
December 31, 2015

PHYSIS
A 53.0 kg circus performer oscillates up and down at the end of a long elastic rope at a rate of once every 6.60 s. The elastic rope obeys Hooke's Law. By how much is the rope extended beyond its unloaded length when the performer hangs at rest?
December 20, 2015

General Science/ Chemistry
Is it necessary to know the exact volume of the “unknown” acid or base to be titrates.
December 10, 2015

Chemistry
How many grams of cesium chloride (CsCl) will be needed to make 750. mL of a 0.100 M CsCl aqueous solution? The formula mass of CsCl is 168.36 g/mol. Remember Molarity: M = (mol solute) / (L of solution) I need help solving this problem
December 6, 2015

Chemistry
A compound that you are studying is soluble in CCl4 but not in water. Would you predict that the compound is polar or nonpolar? Why? [Please explain; don’t just give a trivial answer such as “Because like dissolves like”.]
December 6, 2015

Chemistry
How many grams of cesium chloride (CsCl) will be needed to make 750. mL of a 0.100 M CsCl aqueous solution? The formula mass of CsCl is 168.36 g/mol Molarity: M = (mol solute) / (L of solution)
December 4, 2015

Chemistry
C7H6O3 + C4H6O3 → C9H8O4 + C2H4O2 If you start with 2.09 grams of C4H6O3 how many grams aspirin (C9H8O4) can you make?
December 2, 2015

CHEMISTRY URGENT HELP
How to draw line graph for showing changes in test tubes while showing that exhaled air contains more carbon dioxide than inhaled air
November 28, 2015

Math
What is the circumference of d=2.1cm using 22/7
November 26, 2015

Science
The town of Seaside needs to build a new power plant. The old coal burning plant produces too much pollution and is no longer safe. The mayor decides that he will do some research on alternative forms of energy like nuclear power plants and solar power plants. What types of ...
November 25, 2015

Chemistry
For which element is the gaining of an electron most exothermic? a)Li b)N c)F d)B *explain
November 22, 2015

Science
Please someone help me figure this one out with three reasons. A group of researchers from a local lab are trying to get funding for a research study to determine if the color blue is better than the color green. They have written a proposal and submitted to the company that ...
November 20, 2015

chemistry
2C2H2+5O2(arrow to right) 4CO2+2H2O choices the reaction can be classified as a hydration reaction C2H2 is the oxidizing agent CO2 is the reducing agent carbon is oxidized
November 17, 2015

chemistry
41. Ethyne, C2H2, used in welding react with oxygen as shown below.
November 17, 2015

chemistry
i am working on a practice worksheet and need help with a few i can not understand. please and thank you. I have to post them separately sorry 49.how many grams of water are needed to completely hydrolyze 30.8 g of the ester? A.0.416 g B.30.8 g C.11.3 g D.7.49 g 54. Sodium ...
November 17, 2015

Chemistry
Which molecule contains a polar covalent bond? a)C2H4 b)ZnS c)LiI d)NBr3 e)AgI
November 15, 2015

Philoophy
Definition of Philosophy?? And Definition of logic ??
November 15, 2015

calculus
Use the Left and Right Riemann Sums with 100 rectangle to estimate the (signed) area under the curve of y=−2x+1 on the interval [0,50]. Write your answer using the sigma notation.
November 13, 2015

Calculus
Use the Left and Right Riemann Sums with 80 rectangle to estimate the (signed) area under the curve of y=e^(3x)−5 on the interval of [10,20]. Write your answer using the sigma notation
November 13, 2015

Calculus
Find the points on the curve y=x2+2 closest to the point (0,3). Enter the coordinate with the smallest x-value first and round to the nearest 4 decimal places.
November 5, 2015

programming ( qbasic)
thanks steve sir
November 5, 2015

programming ( qbasic)
rem prints fibonacci series cls a=2 b=1 for p = 1 to 5 print a print b a=a + b b=b + a next p end I have done this program. How do you do it using modular programming.. FUNCTION...END FUNCTION???? I tried but it didnt work
November 5, 2015

programming ( qbasic)
thank you very much
November 3, 2015

programming ( qbasic)
i was given this program by my teacher. it converts decimal number to binary number.. Why is that FIX kept in front of (n/2) ...6th line of the program. why is that FIX written and why? i didnt get it CLS INPUT “ENTER A NUMBER”; N WHILE N <> 0 A = N MOD 2 B$ = ...
November 3, 2015

Physics
A stone is thrown vertically upward with a speed of 21.0 m/s a)How fast is it moving when it reaches a height of 15.8 m b)How much time is required to reach this height?
October 31, 2015

Chemistry
Sulfur dioxide SO2 is released in the combustion of coal. Scrubbers use aqueous slurries of Ca(OH)2 to remove the sulfur dioxide from the flue gases. Write a balanced equation for this reaction and calculate delta So at 298 K (So for CaSO3(s) = 101.4 J/{mol*K}). include the ...
October 29, 2015

chemistry BOB
is this the answer to B ) CH3CH2OH + 3O2 → 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are "burned" to water vapor andCO2. Write a combustion reaction ...
October 27, 2015

chemistry
is this the answer to B ) CH3CH2OH + 3O2 → 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are "burned" to water vapor andCO2. Write a combustion reaction ...
October 27, 2015

chemistry
help!!!! is this the answer to B ) C2H5OH(liq)+ 3O2(g) --> 2CO2(g) +3H2O(liq) In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are "burned" to water vapor andCO2. Write a ...
October 27, 2015

chemistry DR BOB
is this the answer to B ) C2H5OH(liq)+ 3O2(g) --> 2CO2(g) +3H2O(liq) In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are "burned" to water vapor andCO2. Write a combustion ...
October 27, 2015

chemistry DR BOB!
is this the answer to B ) C2H5OH(liq)+ 3O2(g) --> 2CO2(g) +3H2O(liq) In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and ethanol are "burned" to water vapor andCO2. Write a combustion ...
October 27, 2015

chemistry Dr BOB
is this right? C2H6O + 3O2 = 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need ...
October 27, 2015

Chemistry Dr. BOB
I don't get it!! In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing ...
October 27, 2015

Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 26, 2015

CHEMISTRY!!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 26, 2015

chemistry help!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 26, 2015

CHEMISTRY!!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 26, 2015

Chemistry
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 26, 2015

chemistry help!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 25, 2015

chemistry help!!!
In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i think ...
October 25, 2015

Chemistry
the distance from the sun to earth is 1.496 x10 ^8 km. how long does it take light to travel from the sun to earth How do you solve this?
October 25, 2015

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