# Posts by Ben

Total # Posts: 1,005

**To @Bosnian**

I posted a follow up question to your answer to my recent question about a sum of a series.Hope you can check it. Thank you!

**To Bosnian -Math**

As we are finding the sum of n terms,shouldn't the sum of the geometric progression should be, a{ [(r)^(n)- 1]/[r-1] } , where a=(1/7) and r=(1/7) ?

**Math**

How do we find the sum of n terms of the series, 1+(4/7)+(7/49)+(10/343)+..... I know that it can be written as a combination of an arithmetic and geometric progression. 1=(4+3r)/(7^m) ; (r=-1 , m=0) 4/7=(4+3r)/(7^m) ;(r=0,m=1) But how do we find the sum of n terms?

**Math**

A and B are two events. P(A/B)=5/11 P(A~B)=9/10 (~ indicates either A or B) P(B)=x How do we find P(A^B')? (^ indicates both A and B) I got, P(A^B)=5x/11 P(A)=(9/10)-(6x/11) Is there any way we can get a relationship between P(A^B) and the required probability?

**Physics**

Your vertical spring accelerometer has a 200 g mass hanging from it. You climb aboard the roller coaster and watch the accelerometer read 0.4 g for 3 seconds while descending and read 1.5 for 2 seconds while climbing the next peak. The car weighs 2000 kg. What is your ...

**math**

The population of town N increases every year by 2%. What will be the population of this town in 3 years if it is currently nine hundred thousand people. (Round the answer to a whole number.)

**math**

A purchase, with shipping and handling, cost $39.00. What percent of the price of the purchase was spent on shipping and handling if the price of the item was $35.10?

**math**

Find new percentages, and find the actual quantities:75% of 75% of 256

**math**

The volume of industrial production increased ten times. What was the percent increase?

**math**

The population of town N increases every year by 2%. What will be the population of this town in 3 years if it is currently nine hundred thousand people. (Round the answer to a whole number.) Please help

**math**

A tank containing 64 gallons lost 6 1/4 % through leakage. How much was left in the tank?

**math**

For the a the answer equals 1 cuz any number raised to the power of zero is one b. 11"2/11'2=1

**Math**

The answer is 16, 1 squared is 1, 2 squared is 4, 3 squared is 9 so 4 squared is 16, hence 1,1,2,4,3,9,4...16

**science**

A transverse wave has an amplitude of 5 cm, a frequency of 60 Hz and a distance from crest to next trough of 15 cm. Identify the wavelength of this wave. Please someone help asap I cant figure this out. Is there a formula?

**physics**

Radon 86222Rn is a radioactive gas with a half-life of 3.82 d. If there are initially 400 decays/s in a sample, how many radon nuclei are left after 2 d ? Please help, I don't understand how to do this.

**math**

Can someone help me complete the perfect square with this trinomial, I don't understand how to do it. Thanks 1/(x^8) -1/(x^4) +1

**Physics**

In a single-slit diffraction pattern, the distance between the first and second minima is 4.2cm on a screen 3.8m from the slit. Find the slit width given that the wavelength of the light is 530nm. Answer in mm Somebody please help!

**Maths **

Charity = 5% = £15 Saves = 4/5 = 40% = £120 120 - 15 = 105 120 - 15 - 105 = 165 Clothes = £165

**Math**

Find the probability that with one spin, the spinner will not stop on A. Write the answer as a reduced fraction. letters - E A D E F C A B Counter Clockwise

**Science**

Kitty wrong 3-d 5-d

**Trigonometry**

A building 200 feet tall casts an 80 ft long shadow. If a person looks down from the top of the building which of the following is the measure of the angle between the end of the shadow and the vertical side of the building to the nearest degree? I understand that you would ...

**Physics**

You want to jump from an 8.2 m high building to a 10 m high building. The gap between the buildings is 2.4 m, and you can run fast enough so that your speed as you leave the edge of the lower building is 7.0 m/s. What range of launch angles will allow you to reach the top of ...

**CHEMISTRY!!**

What intermolecular forces are responsible for neoprene's stretchiness?

**geometry**

Why must the compass opening be greater than 1/2 of the segment when construction a perpedicular bisector

**Algebra 2**

42

**Accounting**

Net Gain - ER *of the greater of PA or PBO, then amount amortized = Excess/Avg remain svc period yrs

**Accounting**

Herring Wholesale Company has a defined benefit pension plan. On January 1, 2016, the following pension related data were available: ($ in 000s) Net gain–AOCI $ 350 Accumulated benefit obligation 3,170 Projected benefit obligation 3,200 Fair value of plan assets 2,700 ...

**Calculus**

For what values of the constants a and b is (1,3) a point of inflection of the curve y=ax^3+bx^2?

**Maths**

I have a patio which is 3m wide. The roof of this consists of sheets of plastic which are 900mm wide. I have used as few sheets as possible and made all overlaps the same width. What is the width, in millimetres, of this overlap? A. 100 B. 150 C. 200 D. 250 E. 300

**Maths**

If it is 9am now, what time will it be in 2003 hours from now? Mental way please.

**Econ math/logarithms**

If log with base b (2)=0.39 and log with base b (3)=0.61 evaluate the following. log with base b (8). Simplify your answer. How to start? I thought I am supposed to write log base b 2^3 but I don't seem to get an answer that would fit.

**Maths**

Within a square land, Asmo cut out a rectangular land with width of 10 meters (as shown below), the remaining land’s area is 1575 square meters. The area of cut out rectangular land is ______ square meters.

**Calculus**

A 5ft tall person is walking toward a light 20ft off the ground at 8 ft/sec. What is the rate of change of the length of the persons shadow when they are 15ft away from the light? What is the speed of the tip of the shadow moving?

**math**

An age that is at least 25 years old.. Translate to inequality

**data management gr.12**

The Infinity Club consists of 5 boys and 6 girls. How many working groups of 5 people can be formed with: a)no restrictions (my answer is 11C5) b)all boys (is this correct 5C5) c)all girls (answer 6C5) d)more girls than boys (6C4x5C1 +6C3x5C2) e)more boys than girls (5C4x6C1+...

**data management**

How many ways the letters in BIOENGINEERING be arranged if B must not be next to the O. Thanks in advance (is this correct 14!-(13!x2!)

**data management**

I don't think that is the correct answer. The total number of songs 5+6+3 so I guess 14C5x14C6x14C3-5C1x6C1 I'm just very confused. Thanks

**data management**

There are 5 rock songs, 6 country songs, and 3 hip-hop songs. How many different albums can be formed using the songs if the album should contain at least 1 rock song and 1 country song?

**Physics**

Nvm I found out how to solve it.

**Physics**

A ball is raised to a height of 30.0m above the ground. What would its velocity be when it has fallen to a height of 15.0m above the ground. (You must solve this as a conservation of energy problem, and can do it in one step!) Any help would be appreciated..

**Math/Algebra**

oh whoops, yes that is the correct equation! Thanks figured out the answer!

**Math/Algebra**

The equation is Z^2-8+12/Z^2+Z-6 I got this far (Z-6)(Z-2)/(Z+2)(Z-3) It needs to be simplified further, as far as my understanding (Z-2) and (Z+2) cannot be cancelled out.

**Chemistry**

When 1.5 grams of salt are added to 12.0 grams of water and the salt dissolves, what is the mass of the system?

**Calculus 1**

sand is being poured onto the ground forming a conical pile whose height equals 1/4 of the diameter of the base. The sand is falling at a rate of 20cm^3/sec. How fast is the height of the sand pile increasing when it is 3cm high?

**Math**

But the LCM would be 30...

**science**

For the reaction 2N2O(g) ⇌ O2(g) + 2N2(g), what happens to the equilibrium position if the volume decreases? A. does nothing B. shifts to the left C. doubles D. shifts to the right

**Math**

Ahmad have to pay=400*1.07=$428

**Physics**

average velocity is 0 since the total displacement is 0 average speed is 72,since average speed = Total Distance/Total time = 2D/(t1+t2) = 2D/(D/S1+D/S2) = 2S1*S2/(S1+S2)=2*60*90/(60+90) Btw,i think the km should be kmh⁻¹,isn't it?

**Math**

21

**Optics (pls help)**

To save expenses, you would like to buy the shortest mirror that will allow you see your entire body, should the mirror be A) Half your height B) Two-thirds your height or C)equal to your height ? Does the answer depends on how far away from the mirror you stand? Please I need...

**Algebra**

C the power of two+18c-175=0 Help please?

**Physics**

The A above middle C has a frequency of 440 Hz. If you play this note on a piano and the piano string oscillates with an amplitude of 0.55 mm, what is the maximum acceleration of the string?

**Chemistry**

Spontaneous reactions ________. always release free energy*** always result in increase disorder of the system always take place at a rapid rate are always exothermic

**Chemistry**

Which of the following changes would shift the reaction shown here to the right (product side)? 4HCl (g) + O2(g) < = > 2Cl2 (g) + 2 H2O (g) addition of Cl2*** decrease of pressure increase of pressure removal of O2

**Chemistry**

Which of the following changes would shift the reaction shown here to the right (product side)? 4HCl (g) + O2(g) < = > 2Cl2 (g) + 2 H2O (g) addition of Cl2*** decrease of pressure increase of pressure removal of O2

**Chemistry**

At what stage of a reaction do atoms have the highest energy Product stage Reactant stage Transition state stage*** The stage of the highest energy depends on the atom

**Chemistry**

When 2.0 g of solid NaOH (∆Hsoln = -445.1kJ/mol) dissolves in 10L of water, how much heat is released? 445.1 kJ 44.51 kJ 22.26 kJ 11.13 kJ***

**Chemistry**

Calculate the energy required to produce 5.00 mol of Cl2O7 on the bases of the following balanced equation. 2Cl2(g) +7O2(g) +130kcal - - > 2 Cl2O7 5.00 kcal 65 kcal*** 130 kcal 325 kcal

**Chemistry**

What does the symbol ∆H stand for? one Calorie given off by a reaction the heat capacity of a substance*** the heat of a reaction for a chemical reaction the specific heat of a substance

**Chemistry**

Which of the following is the correct unit for specific heat? degree C*** Cal cal/g cal/(g*deg C)

**Chemistry**

The heat capacity of an object depends in part on its enthalpy mass potential energy*** shape

**Chemistry**

When your body breaks down sugar completely, how much heat is released compared to burning the same amount of sugar in a flame? The body releases___ less heat than the flame*** more heat than the flame same amount of heat as a flame the body releases so heat

**Chemistry**

What would likely happen if you were to touch a metallic beaker in which an endothermic reaction were occurring? The beaker would probably feel cooler than before the reaction started. The beaker would probably feel warmer than before the reaction started.*** The beaker would ...

**science**

mechanical to potential to gravitational

**Algebra**

Whats the question?

**Geometry**

Segment AD is perpendicular to the radius of circle (B) and the radius of circle (c). If radius BA=6in, segment AD=21in and radius CD=16in, find the length of BC to the nearest tenth of an inch.

**math**

The area of a plot of land is 2496 square meters. A small part of the land is fenced. The ratio of the area of the plot of land to the area that is not fenced is 48:31. What is the area of the land that is not fenced? (5th grade math)

**Chemistry**

A sample of sulfur hexafluoride gas (SF6) occupies a volume of 3.230 Liters at 7.011 x 101 oC. Assuming the pressure is constant, what will the final temperature be (in o C) if the volume is increased to 7.350 Liters?

**Physics**

A plane travels 1000 km at an angle of 40 degrees East to North, then changes direction and travels 500 km at an angle of 20 degrees North to East. What is the magnitude and direction of the planes total displacement?

**Chemistry**

How many grams of MgCl2 would be required to make 440 g of magnesium ?

**Physics**

The human heart discharges 75ml of blood at each beat against the pressure of 0.1mmHg. Calculate the power of the heart assuming that the purse frequency is 80 beats per minute.(density of mercury is 13.6*10^3 Kg/m3)

**PHYSICS!!**

This is also a part of it!! Coincidently the horn on your car, which you sound as you narrowly miss the flautist in problem 1, also give a constant 300 Hz. tone. What frequency does the flautist hear before and after you pass them?

**PHYSICS!!**

After giving an intense performance, a confused and disoriented flautist has wandered onto the motorway! They are playing a constant 300Hz on their flute and are essentially stationary If you are driving along the motorway at 100 km/h(27.8 m/s). What is the frequency you hear ...

**AP Physics**

Two identical, small balls are suspended by separate 0.25m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10^-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a ...

**PHYSICS!!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...

**L.o**

I don't know

**PHYSICS HELP!!**

Im so confused on how to calculate part b..... the rest of the answer i know how to solve it...

**PHYSICS HELP!!**

(a) Suppose 10 astronauts are sent to Mars and then back to Earth. The average power usage of each astronaut is 10,000,000 joules per day. What is the average power usage of each astronaut in watts and horsepower? (b) It will take approximately 2 years for the astronauts to ...

**Math**

Three Bases and home plate make a diamond that is 90 feet on each side. What is the perimeter of the diamond?

**Chemistry**

Calculate how many grams of MgO that can be produced from 4.58 of Mg metal and 0.99 of O2 gas. Recall the balanced reaction is: 2 Mg (s) + O2 (g) 2 MgO (s) And the answers to part one were: Moles of MgO from 4.58 g Mg = 0.1884 Moles of MgO from 0.99 g O2 = 0.0619 Limiting ...

**Chemistry**

If 12.01 g of Mg metal and 6.56 g of O2 gas are reacted, 1) How many moles of MgO can be produced from the given mass of Mg? 2) How many moles of MgO can be produced from the given mass of O2? 3) From the above calculations, determine which of the reactants is the limiting ...

**Chemistry**

If 12.01 g of Mg metal and 6.56 g of O2 gas are reacted, 1) How many moles of MgO can be produced from the given mass of Mg? 2) How many moles of MgO can be produced from the given mass of O2? 3) From the above calculations, determine which of the reactants is the limiting ...

**Chemistry**

Given that you are starting with 20.816 grams of Fe and 7.079 grams of O2, what is the THEORETICAL YIELD of Fe2O3 in moles?

**Math**

A certian recipe asks for 5/8 cup of granola. How much is needed to make 1/9 of a recipe?

**Algebra**

A campground consists of 8 square campsites arranged in a line along a beach. The distance from the edge of a campsite to the water at the end of the beach is 5 yards. The area of the campground, including the beach, is 1102 square yards. What is the width of one campsite? -9....

**math**

36

**Physics**

A missile is fired with a launch velocity of 15000 ft/s at a target 1200 miles away. At what angle must it be fired to hit the target? Use g = 32 ft/s.s

**Math**

But that's all the information

**Ms. Sue???**

Can you help me

**Math**

The pool is partially filled with water. The volume of the water in the pool is 45 cubic feet. How deep is the water? A.0.5 ft B.1.5 ft C.2.5 ft** D.3.5 ft Am I right?

**Chemistry**

A flask of hydrogen gas is collected at 1.023 atm and 35 degrees C by displacement of water at 35 degrees C is 42.2 mm Hg. What is the partial pressure of hydrogen gas in the flask? Not exactly sure where to start with this question, or what formula to use. Thanks in advance

**Differential equation (urgent pls!!!)**

Reduce the differential equation below to an exact equation (X - 2siny + 3)dx -(4siny - 2x + 3)dy=0. The problem here is how to solve for the integrating factor...any help pls?

**maths(Differential Equation)**

Solve the differential equation below (Y + y^3/3 + x^2/2)dx + 1/4(1 + y^2)xdy=0

**Accelerated algebra**

Comet C has an elliptical orbit of eccentricity 0.9638 with the sun at one focus. The greatest distance of the comet from the sun is 2940 million miles. Find the least distance between the comet C and the sun.

**Physics**

Electrons in a narrow beam travelling at a steady speed of 5 x 10^7 ms^-1 are directed into the space between two oppositely charged parallel plates 50mm apart. The potential difference between the plates is 2500V. The initial direction of the beam is parallel to the plates. ...

**Physics - Electrons (Inside the atom)**

Thank you

**Physics - Electrons (Inside the atom)**

A beam of electrons is directed into uniform electric and magnetic feilds that are at right angles to one another and to the beam direction. The strength of the magnetic feild is 55 mT; the electric feild strength is adjusted to 600 kV m^-1 when the beam passed through the ...

**Calculus**

Find the area of the region bounded by the graphs of y = x, y = 6 - 2x, and y = 0. (4 points) 3 6 9 None of these Please help I don't know how to do this

**Algebra**

(60/x)x66=400

**Science (Physics)**

A ball is projected horizontally from the top a hill with a velocity f 30mls. If it reaches the ground 5seconds later, the height of the hill is?