Friday

February 12, 2016
Total # Posts: 265

**Chemistry**

Explain how the presence of several oxygen atoms in a compound containing an -OH group can make the compound acidic. I don't understand this because according to Arrhenius, bases have OH. And it doesn't apply to either Lewis's acid-base theories, or the Bronsted-...
*February 11, 2016*

**Math**

Mutiply 3/4 by 6. It may help to think about it in terms of a fraction 3/4x6/1 In this case you would end up with 18/4, an improper fraction. Some teachers may want mixed numbers (4 1/2). But in higher up math, improper fractions are mainly used. In decimals it would be .75 x ...
*February 8, 2016*

**Chemistry**

a. Calculate the expected freezing-point depression of a 0.200 m KNO3 solution. b. Will the value you calculated match the actual freezing-point depression for this solution? Why or why not? a). -0.372 degrees Celsius b). Possibly because not all of the substance ionizes 100% ...
*February 3, 2016*

**algerbra**

There is no equation that corresponds directly to parallel lines. However, when given two points for each line, the slope equation (m=y2-y1/x2-x1) can help. If after doing the equation and reducing (if necessary) you come up with the same answers, then the lines are parallel. ...
*February 3, 2016*

**Physics**

40 degrees*
*January 31, 2016*

**Physics**

Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be above the horizontal.
*January 31, 2016*

**Physics**

Yes, it does thank you!
*January 26, 2016*

**Physics**

could you break down this problem a little more and explain what is happening?
*January 26, 2016*

**Physics**

Damon, I understand finding the vertical and horizontal velocities.I start getting confused when I have to integrate the two velocities and use time to find height
*January 26, 2016*

**Physics**

A person wants to launch a water balloon and hit the top of a tower, 50.0 meters away. The water balloon launcher is angled at 25 degrees. The water balloon leaves the launcher at 68 m/s. If the balloon hits the top of the tower, how high was the tower?
*January 26, 2016*

**Science**

dick and big tits
*January 11, 2016*

**Language Arts**

"Pacman" is correct! :-)
*January 6, 2016*

**Health**

"Anonymous" is 100% correct!
*December 14, 2015*

**Physics**

a crane holds a 500kg wrecking ball in place using a wire with tension T1 and is horizontal to the ground. The crane swings it with a cable under tension T2. if the wire holds the ball in place so the cable forms a 20 degree angle with the vertical, determine tensions T1 and T2.
*November 15, 2015*

**math**

Theater Total Value of Ticket Sales A $1,600 B $2,000 C $1,800 D $4,800 E $3,200 The table above shows the total value of the ticket sales for an afternoon show in each of five movie theaters. There were 300 tickets that were sold for each theater. The tickets cost $8 for each...
*November 13, 2015*

**P.E....Plzzzzzzz Help me:)**

What do you know, I got a 100% as well, thanks Shawn!
*October 31, 2015*

**Pre-Algebra, please help!**

which of these non terminating decimals can be converted into a rational number? a. 0626226222... b. 0.0020220222... c. 0.123123123...*** d. 0.898998999... Am I correct? Thank you!
*October 30, 2015*

**Pre-Algebra**

At a halftime show a marching band marched in formation. The lead drummer started at a point with coordinates (-2,-5) and moved three steps up and 1 step right. Write a rule to describe the translation. What were the coordinates of the drummers final position? Please help
*September 28, 2015*

**Chemistry**

How much heat is needed to convert 10g ice to 10g water vapor?
*July 7, 2015*

**Math**

AN ATHLETIC FIELD HAS THE SHAPE OF A 40 YARD BY 100 YARD RECTANGLE WITH A SEMICIRCLE AT EACH END. A RUNNING TRACK THAT IS 10 YARDS WIDE SURROUNDS THE FIELD. FIND THE AREA OF THE ATHLETIC FIELD WITH THE TRACK INCLUDED.
*May 18, 2015*

**Physics Fluids**

Water is flowing through a rectangular channel that is 12 m wide with a speed of 0.75 m/s. The water then flows into four identical rectangular channels that have a width of 3.0 m. The depth of the water does not change as it flows into the four channels. What is the speed of ...
*April 6, 2015*

**Physics Fluids**

When a block of volume 1.00 × 10–3 m3 is hung from a spring scale, the scale reads 10.0 N. When the same block is then placed in an unknown liquid, it floats with 2/3 of its volume submerged. The density of water is 1.00 × 103 kg/m^3. Determine the density of ...
*April 6, 2015*

**Physics Fluids**

A column of oil of height 70.0 cm supports a column of an unknown liquid. Assume that both liquids are at rest and that the density of the oil is 840 kg/m^3. Determine the density of the unknown liquid.
*April 6, 2015*

**reading**

Comma after Skydiving, rock climbing, for the first paragraph second paragraph you need a coma after floor, chair, That is all I know
*March 25, 2015*

**math**

I need help with an example of at least one because I do not understand what they mean by the simple measure
*March 25, 2015*

**math**

Gather a set of data. Choose a small sample, between 10 and 20 pieces of data, and a simple value to measure, such as the ages of visitors in a park, or the number of text messages each person in your family receives in one day. Choose a display for your data, such as a ...
*March 25, 2015*

**algebera**

Summer, your answer would be hexagonal pyramid :-) The answers for the one that Summer was asking is 1. B 2. C 3. B 4. A 5. B 100% I guarantee
*February 10, 2015*

**physics**

While you are in detention after school, your teacher tells you to slide a large, 89.7 kilogram box across the floor. The coefficient of static friction (ìstatic) between the box and the floor is 0.50. Compute the force parallel to the ground (F parallel)required to ...
*January 12, 2015*

**Physics**

The surface area of an adult human is about 1.8m2 . Suppose a person with a skin temperature of 34 ∘C is standing nude in a room where the air is 25∘C but the walls are 17 ∘C. A) There is a "dead-air" layer next to your skin that acts as insulation...
*November 30, 2014*

**Health**

1. B, burned 2. A, eating patterns 3. A, heredity 3/3, 100% correct
*October 28, 2014*

**Chemistry 101**

A solution containing 83.100 g of sodium hydroxide [molar mass = 40.0 g/mol] was neutralised using phosphoric acid. Calculate the moles of sodium phosphate formed (assuming that the reaction goes to completion). Give your answer to three significant figures. I'm not sure ...
*October 13, 2014*

**NH4NO3 explosive?**

How is NH4NO3 explosive? Please explain with chemical equation. Thank you so much!
*October 6, 2014*

**Algebra 1 Check**

This is the last question on my homework and I wanted to know if I got it right. Thanks! Which of the following inequalities is true for all real numbers of x? a.) x^2≤x^3 b.) 2x^3≤4x^2 c.) 4x^2≤(4x)^2 d.) 4(x-3)^2≥4x^2-3 My answer: C.
*October 3, 2014*

**Applied Business Law - 2**

As company ombudsman, your task is to investigate complaints of wrongdoing on the part of corporate directors and officers, decide whether there is a violation of the law, and deal with the wrongdoers accordingly. Jane, a shareholder of Goodly Corporation, alleges that its ...
*September 5, 2014*

**Algebra 2**

The highest speed reached by a solar powered vehicle is 48.71 mph. This record was set by a Sunracycer on June 24, 1988 in Meza, AZ. How far could this car travel in 2.5 hrs at this speed.
*June 15, 2014*

**Physics **

A 2.5-kg block is sliding along a rough horizontal surface and collides with a horizontal spring whose spring constant is 320 N/m. Unstretched, the spring is 20.0 cm long. The block causes the spring to compress to a length of 12.5 cm as the block temporarily comes to rest. ...
*May 30, 2014*

**Algebra 2**

1.) The chief designer for a large automobile company is considering 4 different radiator grills, 2 different style of headlights, and 5 different rear fender designs. If an automobile style consists of a grill, headlight, and rear fender, how many different styles of ...
*May 8, 2014*

**Biology**

Briefly describe how the process of dehydration synthesis creates polymers.
*April 16, 2014*

**MATH QUIZ PLS HELP!!!**

The answers: 1. D, 285.7 ft^2 2. B, 1536 cm^2 3. C, 803.8 in.^2 4. A, 1607.7 in.^3 5. B, 105 mm^3 6. A, 147 yd^3 7. B, 108 cm^3 8. C, 415 in^3 9. A, 628 mm^3 I swear by these answers. I got a 9/9, a 100% I'm only helping because I have a hard time with this and I'm ...
*March 19, 2014*

**Cyber safety**

"abcd" is 100% correct :-) A 1&3 B
*February 27, 2014*

**Chemistry**

nv/Ns=A*e(-Hv/(KT)) K=1.381E-23 Hv= 104000/6.023e+23 A=1 vacancy density=(nv/Ns)*Cu density*(6.023e+23/Cu atomic weight)
*November 15, 2013*

**Chemistry**

No, I didn't find that answer.
*November 15, 2013*

**Chemistry**

Ev= elastic strain energy per unit vol=? Ev=(1/2)*Ey*E2(square) Ey= 8.0*10e+10 N/m2 E= 9.0e-3 so square -> E2= 8.1e-5
*November 15, 2013*

**Chemistry**

The Young's modulus for a material is 8.0 x 1010 N/m2. The material is stretched to a strain of 9.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3). Answer: 3240000
*November 15, 2013*

**Math**

There are some caps in a box. 1/6 are red, 1/3 are blue, and 3/7 of the remainder are green. If there are 27 green caps, how many caps are there all together?
*November 14, 2013*

**Biology/Chem**

Soy sauce is prepared by fermenting a salted mixture of soybeans and wheat with several microorganisms including yeast over a period of 8-10 months. After the solids are removed, the resulting sauce is rich in lactic acid and ethanol. How aere these 2 compounds produced? In ...
*October 19, 2013*

**Chemistry**

A 50mL solution of Histidine-HCl (Histidine: pKa1=1.8, pKa2=9.2, pKa3=6.0)is titrated with 0.500M NaOH. What is the expected pH of the histidine solution at the points in the titration when 14.0mL, 26mL, and 38mL of the NaOH titrant is added?
*October 2, 2013*

**Chemistry**

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported. Calculate the total free ...
*September 29, 2013*

**physics**

3.795 seconds
*August 16, 2013*

**Algebra**

If Don Gecewicz invests $5000 at 9% interest compounded quarterly, find the amount after 4 years.
*May 27, 2013*

**Math**

A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?
*May 9, 2013*

**algebra**

Christine lives in Bangor, Maine , and her friend Denise Brown lives in Sioux City, Iowa. They both drive to Dade City, Florida, for the winter. The trip is 1600 miles for Christine and 1500 miles for Denise. If Christine drives 5 miles per hour faster than Denise, and if they...
*May 2, 2013*

**Calculus**

Evaluate the following limits (x^2 + 2x - 8)/x-2 Lim x->2
*April 29, 2013*

**math**

how to do pre algebra pizzazz page e 28
*April 15, 2013*

**Math**

Raymond has exactly 360 square inches of cardboard to make a box.he wants two of the dimensions to be 6 inches and the other one to be a whole number of inches.how many different size boxes can he make?
*April 5, 2013*

**Math**

How many 6 inch pieces can you cut from a spool of ribbon that is 10 yards long?
*April 4, 2013*

**algebra**

not B, I mean A. -33
*March 5, 2013*

**algebra**

Find the 11th term of the arithmetic sequence 7, 4.4, 1.8, -0.8, … A. -33 B. -19 C. 33 D. 19 B
*March 5, 2013*

**algebra**

Find S10 for (-1) + (-7) + (-13) + (-19) +... A. 250 B. -280 C. (-23) D. 132 C.
*March 5, 2013*

**algebra**

Find S25 for (-7) + (-2) + 3 + 8 +... A. 1,320 B. 1,325 C. 825 D. 820 I think A
*March 5, 2013*

**algebra**

Find S25 for 1/2 + 1 + 3/2 + 2 +... A. 160 B. 162 C. 160.5 D. 162.5 I think D
*March 5, 2013*

**algebra **

Find S10 for 2 + 5 + 8 +... A. 155 B. 152 C. 255 D. 135 I say A.
*March 5, 2013*

**Algebra**

Jennifer has a recipe that calls for horseradish sauce that is 45% pure horseradish. At the grocery store she finds one horseradish sauce that is 30% pure horseradish and another that is 80% pure horseradish. How many teaspoons of each of these horseradish sauces should ...
*March 3, 2013*

**Math**

Althea invested $10,000 for one year, part at 7% and part at 6 1/4%. If she earned a total interest of $656.50, how much was invested at each rate?
*March 3, 2013*

**Economics**

nio
*February 9, 2013*

**algebra**

Find the maximum or minimum of the following quadratic function: y = x2 - x - 56. A. -56 B. 56 C. -225/4 D. 225/4 d
*February 4, 2013*

**algebra**

Which of the following relations is a function? A. {(5, 2), (3, 2), (4, 2), (5, 1)} B. {(1, 2), (1, 3), (2, 1), (3, 4)} C. {(1, 3), (2, 6), (3, 8), (1, 7)} D. {(1, 4), (8, 9), (10, 11), (12, 12)} I say c
*February 4, 2013*

**algebra**

f of x = the square root of 2x minus 5 Find f(7) A. 2 B. 3 C. -5 D. 7 A
*February 4, 2013*

**algebra**

f of x = the square root of 2x minus 5 Find f (27) A. 2 B. 3 C. -5 D. 7 D not sure on this stuff, could you explain the steps?
*February 4, 2013*

**algebra**

Determine if the inverse of function {(-3, -6), (-1, 2), (1, 2), (3, 6)} is also a function. A. function B. not a function B
*February 4, 2013*

**algebra**

f of x = the square root of 2x minus 5 Find f(4.5) A. 2 B. 3 C. -5 D. 7 B
*February 4, 2013*

**algebra**

could you explain the steps?
*February 4, 2013*

**algebra**

What is the range of the inverse of relation {(1, 7), (2, -4), (5, 6), (2, 8)}? A. {1, 2, 5} B. {-4, 6, 7, 8} C. {1, 5} D. {-4, 7, 8} B
*February 4, 2013*

**algebra**

Simplify the rational expression: x−5 /x 2 −x−20 A. x−4 B. x+4 C. x 2 −15 D 1 /x+4 D
*February 3, 2013*

**algebra**

Find f o g if f(x) = 2x - 1 and g(x) = x + 2. A. 2x - 3 B. 2x + 1 C. 2x - 1 D. 2x + 3 B
*February 3, 2013*

**algebra**

Find f o g if f(x) = x + 7 and g(x) = 3x – 2. A. 3x + 5 B. 3x - 5 C. 3x + 19 D. -3x - 19 D
*February 3, 2013*

**algebra**

Find g of f if f(x) = 2x - 1 and g(x) = x + 2. A. 2x - 3 B. 2x + 1 C. 2x - 1 D. 2x + 3 D
*February 3, 2013*

**algebra**

Find g o f if f(x) = x + 7 and g(x) = 3x – 2. A. 3x + 5 B. 3x - 5 C. 3x + 19 D. -3x - 19 C
*February 3, 2013*

**algebra**

Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1. A. 3x2 + 3x B. 3x + 1 C. 4x + 1 D. 3x2 + 1 D
*February 3, 2013*

**algebra**

Find the slope between points (4, 6) and (-2, 6). A. 0 B. Undefined slope C. one fourth D. -4 D
*February 3, 2013*

**algebra**

Find f(x)·g(x) if f(x) = 3x and g(x) = x + 1. A. 3x2 + 3x B. 3x + 1 C. 4x + 1 D. 3x2 + 1 A
*February 3, 2013*

**algebra**

I got B and C mixed up, I meant to say C B is suppose to be x^2
*February 3, 2013*

**algebra**

If f(x) = 2x and g(x) = ½ , calculate f(x) • g(x) A. x B. x2 C. 2x D. 2x2 I say B
*February 3, 2013*

**Physics**

A mass m1 = 4.1 kg rests on a frictionless table and connected by a massless string to another mass m2 = 5.9 kg. A force of magnitude F = 32.0 N pulls m1 to the left a distance d = 0.83 m. 1) How much work is done by the force F on the two block system? 2) How much work is ...
*January 2, 2013*

**Msth**

CBDAC is 100% correct :-)
*December 12, 2012*

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.
*December 1, 2012*

**physics**

Calculate the speed of a 10,000 kg airliner with a kinetic energy of 3.1 x 10^9 J.
*December 1, 2012*

**Math**

37% of college students say they use credit cards because of the rewards program. You randomly select 10 college kids and ask each to name the reason he or she uses credit cards. Find the probability that the number of college students who say they use credit cards because of ...
*November 25, 2012*

**chemistry**

whoops D
*November 24, 2012*

**chemistry**

solve the following and express your answer in scientific notation: (5.3 x 10^4) + (1.3 x 10^3) A. 5.4 X 10^4 B. 5.4 X 10^8 C. 6.6 X 10^7 D. 6.9 X 10^7 I say c
*November 24, 2012*

**chemistry**

got it now B
*November 24, 2012*

**chemistry**

one isotope of chromium (atomic number 24) has an atomic mass of 53 amu. how many neutrons are in this particular isotope of chromium? A. 24 B. 29 C. 53 D. 77 I say A
*November 24, 2012*

**chemistry**

amphetamine (c9h13n) is a powerful stimulant. what is the percent composition of all of the elements in this compound? A. 9%C;13%H;1%N B. 30%C;10%H;60%N C. 60%C;35$H;5%N D. 80%C;9.6%H;10.4%N I think b
*November 23, 2012*

**chemistry**

C. 81.8%
*November 23, 2012*

**chemistry**

what is the percent by mass of carbon in c3h8? A. 18.20% B. 20.0% C. 81.8% D. 85.0% I say A
*November 23, 2012*

**chemistry**

how many moles are in 243.6 g caco3? A.7.41 mol caco3 B 2.43 mol caco3 C.102.46 mol caco3 D.88.1 mol cao3 I say A
*November 23, 2012*

**chemistry**

a compound is found to be 94.1% o and 5.90% h. its molecular mass is 34.0. what is its molecular formula A. H3O2 B. OH C. H2O D. H2O2 I think D
*November 23, 2012*

**Physics**

A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.
*November 21, 2012*

**chemistry**

in the formula for calcium bromide (CaBr2), what does the subscripted two indicate? A. the bromide atom has a charge of 2- B. the bromide atom has a charge of 2+ C. there are two bromide atoms for every calcium atom. D. there are two calcium atoms for every bromide atom I say C.
*November 20, 2012*