# Helen

Popular questions and responses by Helen-
## Math

Suppose we have a bag with $10$ slips of paper in it. Eight slips have a $3$ on them and the other two have a $9$ on them. How many $9$'s do I have to add before the expected value is at least $8$?

*asked on April 26, 2020* -
## Algebra

How many 4-digit multiples of 7 are there?

*asked on May 16, 2020* -
## physics

A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of 3.7×10−4 N.Find the strength of the electric field to produce this force.

*asked on April 14, 2012* -
## Algebra

One of the sides of a parallelogram has the length of 5 in. Can the lengths of the diagonals be: 6 in and 7 in?

*asked on February 28, 2020* -
## statistic

For each of the following, assume you are working with a standard deck of 52 cards. There are 13 cards (2,3,4,5,6,7,8,9,10, jack, queen, king and Ace) in each of four suits (Clubs, Diamonds, Hearts, and Spades). a. What is P(Club) when drawing one card? b.

*asked on March 13, 2014* -
## Chemistry

An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude. a. if air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100mm Hg,

*asked on May 15, 2010* -
## physics

An energy of 6.0×10−2 J is stored in the metal sphere on top of a Van de Graaff generator. A spark carrying 1.0 micro-coulomb (1.0×10−6 C) discharges the sphere.Find the sphere's potential relative to ground. last one for the night

*asked on April 14, 2012* -
## math

a man spent 1/4 of his monthly salary on rent ,2/5 on food and 1/6 on books. If he still had ghana 55000 left what was his monthly salary

*asked on June 26, 2016* -
## MATH

The measure of two complementary angles are in the ratio 7:11. What is the measure of the smaller angle? Would the correct answer be 35?

*asked on February 23, 2012* -
## finance

Suppose an investment offers to triple your money in 36 months (don’t believe it). What rate of return per quarter are you being offered

*asked on October 17, 2014* -
## Calculus 2 - Series

I am so confused on how to do series problems...especially these. How can you tell the pattern and determining the formula for them? Can someone please help? 26) Write the first five terms of the sequence {an} whose nth term is given. an = (n + 3)/(2n −

*asked on March 29, 2015* -
## Algebra

One of the sides of a parallelogram has the length of 5 in. Can the lengths of the diagonals be: 4 in and 3 in?

*asked on February 28, 2020* -
## Geometry

The 8th term of a(GP) is 640. If the first term is 5, find the common ratio and the 10th term?

*asked on October 16, 2019* -
## Maths

A man 1.5m tall is 15m away from a tower 20m high.What is the angle of elevation of the top of the tower from his eyes?

*asked on April 11, 2017* -
## Grammar

Label each sentence below as simple, compound, complex, or compound-complex. 1. You can enter the data, or you can interview the candidates. (compound) 2. No one knew the man, and no one asked his name. (compound) 3. After the officer pulled Tim over, Tim

*asked on December 16, 2015* -
## English

Words to choose from: Commemorate, complacent, consensus, deplete, diligent, empathy, menial, niche, transcend, and waive At Eastman High School reunions, the conversation usually gets around to the question “who was our best teacher?” And year after

*asked on July 3, 2014* -
## Math

farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row

*asked on September 24, 2011* -
## Algebra

Prove the divisibility of the following numbers: 810−89−88 by 55

*asked on January 29, 2020* -
## statistic

A study was conducted to determine the effectiveness of varying amounts of vitamin C in reducing the number of common colds. A survey of 450 people provided the following information: Daily amount of vitamin C taken None 500 mg 1000 mg No Colds 57 26 17 At

*asked on December 14, 2013* -
## Geometry

A grid shows the positions of a subway stop and your house. The subway stop is located at (-5,2) and your house is located at (-9,9). What is the distance, to the nearest tenth unit between your house and the stop?

*asked on March 14, 2012* -
## MATH! PLEASE REPLY ASAP!

VWXYZ is a rectangle-based pyramid where WX=66 cm and XY=32cm. The vertex is vertically above the center of the base. Given that the slant heights VA and VB are 56 cm and 63 cm respectively, find the total surface area of the pyramid. Additionally, find

*asked on January 23, 2011* -
## Algebra

Given: ΔABC, m∠1=m∠2, D∈ AC, BD = DC m∠BDC = 100º Find: m∠A m∠B, m∠C

*asked on May 1, 2020* -
## Algebra

Write an equation of the line passing through each of the following pairs of points. (−10, 4), (2, −5)

*asked on October 2, 2019* -
## math

You want to determine the height of your school. The building casts a 6 foot shadow at the same time you cast a 15 inch shadow. If you are 5 feet tall how tall is the building?

*asked on February 23, 2012* -
## Algebra

In ΔABC, AC = BC, CD ⊥ AB with D ∈ AB , AB = 4 in, and CD = square root of 3 in. Find AC.

*asked on December 20, 2019* -
## Gr.12 data management

There are 52 white keys on a piano. The lowest key is A. The Keys are designated A. B, C, D, E, F, G in succession, and then the sequence of letters repeats, ending with a C for the highest key. A) if five notes are played together simultaneously, in how

*asked on July 8, 2015* -
## algebra

An initial population of 298 quail increases at an annual rate of 8%. Write an exponential function to model the quail population. What will the approximate population be after 3 years f(x)=298(1.08)^x;375 f(x)=298(0.08)^x;153 f(x)=298(8)^x;305

*asked on January 12, 2014* -
## algebra

During a manufacturing process, a metal part in a machine is exposed to varying temperature conditions. The manufacturer of the machine recommends that the temperature of the machine part remain below 141°F. The temperature T in degrees Fahrenheit x

*asked on December 18, 2013* -
## Physics

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball

*asked on December 4, 2011* -
## Algebra

How many 4-digit numbers are neither multiples of 2 nor multiples of 5?

*asked on May 17, 2020* -
## English

9. Read these line, from The Passionate Shepherd to his love. "The country swains shall dance and sing/For they delight each May morning.?If these delights thy mind may move,/Then live with me, and be my love." What sort of life is the shepherd offering

*asked on December 17, 2013* -
## Chemistry

The heat capacity of lead is 0.13 J/g•°C. How many joules of heat would be required to raise the temperature of 15 g of lead from 22°C to 37°C?

*asked on September 17, 2012* -
## Algebra

Given: ABCD is a rectangle, AC∩BD= O, m∠ABD=30°, AC=16 in. Find BC

*asked on June 5, 2020* -
## Algebra

Write the expression a15 as a product of two exponents with the same base one of which is equal to a^6; a^9; a^2; a^14. a15 = a6 · ... a15 = a9 · ... a15 = a2 · ... a15 = a14 · ...

*asked on October 22, 2019* -
## Algebra

Write an equation of the line passing through each of the following pairs of points. (4, 0), (−2, 8)

*asked on October 2, 2019* -
## Math

he wholesale cost of a delivery van is $31,300. The original markup was 26% based on selling price. Find the final sale price after the following series of price changes: a markup of 46%, a markup of 15%, a markdown of 40%, and a markup of 14%. (Round each

*asked on August 2, 2017* -
## Chemistry

calculate cell potential at 25C for: 3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The standard reduction potentials are as follows: Fe3+ (aq) + e- = Fe2+ (aq) Al3+ (aq) + 3e-=Al (s) Eo = +0.771 V Eo = -1.66 V

*asked on October 18, 2010* -
## Algebra

In a right triangle the leg opposite to the acute angle of 30° is 7 in. Find the hypotenuse and other leg.

*asked on January 8, 2020* -
## Algebra

Write each equation in slope-intercept form of the equation of a line. Underline the slope and circle the y-intercept in each equation. 2x+y=1 The slope-intercept form is The slope is The y-intercept is

*asked on October 5, 2019* -
## Physics

A 71 kg skydiver jumps out of a plane at an altitude of 1370m. She reaches terminal velocity of 68m/s. She opens the parachute at an altitude of 328m, and lands with a speed of 2.8m/s. a)How much (negative) work is done by air resistance before she opens

*asked on February 20, 2017* -
## Geometry

Find the length of d in simplest radical form of he diagonal of a cube with sides of s units.

*asked on March 14, 2012* -
## communication

In response to a compliment on his excellent oral presentation, a Japanese business executive replies, "No, it wasn't very good." Which of the following is the MOST likely explanation for this response? He thought the person giving the compliment was his

*asked on June 3, 2010* -
## math

Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value of y-2x?

*asked on April 21, 2009* -
## Algebra

It takes a boat going upstream 3 hours to cover the same distance, as it would cover in 2 hours going downstream. What is the speed of the boat if the speed of the current is 3 kilometers per hour?

*asked on April 29, 2020* -
## Algebra

For what value(s) of k will the relation not be a function? A = {(1.5k−4, 7), (−0.5k+8, 15)}

*asked on September 26, 2019* -
## Reading

Of all the gods and goddesses of Olympus, perhaps none was loved by humans as much as Demeter. Demeter was the goddess of the soil and of the crops, to which she tended with great care all through the year. Demeter enjoyed her duties because she cared for

*asked on March 16, 2016* -
## physics

A woman raises a 65N box 16m in 4 seconds.Calculate the work done by the woman on the box

*asked on September 30, 2014* -
## chem

How many moles of carbon, hydrogen, and oxygen are present in a 100-g\rm g sample of ascorbic acid?

*asked on July 20, 2014* -
## chemistry

Freezing and Melting are two different physical changes that involve the same amount of energy. compare and contrast the potential energy diagrams that would represent each of these processes. Be specific in your comparison.

*asked on March 31, 2014* -
## algebra

An exam consists of two parts, Section X and Section Y. There can be a maximum of 95 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two

*asked on January 11, 2014* -
## Math

A bucket contains blue balls and yellow balls. the probability of removing two blue balls without replacement is 2/5 and he probability of removing three blue balls without replacement is 1/5. Why must there be two more blue balls then yellow balls? How

*asked on February 9, 2012* -
## Physics

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball

*asked on December 4, 2011* -
## math

An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie, a student at the local high school, purchases a flute for $306. How

*asked on April 21, 2009* -
## Math

A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how many

*asked on April 21, 2009* -
## Chemistry

At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)⇄2CO(g) + O2(g) is about 1*E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equilibrium

*asked on August 16, 2008* -
## Algebra

How many 2-digit numbers are multiples of 2 but not 4?

*asked on May 5, 2020* -
## Algebra

Find the measure of the exterior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

*asked on February 7, 2020* -
## Algebra

Prove the divisibility of the following numbers: 8^10−8^9−8^8 by 55

*asked on February 5, 2020* -
## Algebra

Prove the divisibility of the following numbers: 45^45·15^15 by 75^30

*asked on February 4, 2020* -
## Algebra

Put a positive factor back into the square root: −5 0.6

*asked on December 17, 2019* -
## Algebra

Take a factor out of the square root: 4 450

*asked on December 17, 2019* -
## Algebra

Can you tell which of the following triangles are right and explain your answer? The numbers represent the lengths of the sides: 5, 6, 7

*asked on December 13, 2019* -
## Algebra

Write the expression as a cube of a monomial. 0.001y^12

*asked on October 28, 2019* -
## Algebra

Jim and his dad are bricklayers. Jim can lay bricks for a fireplace and chimney in 5 days. With his father's help, he can build it in 2 days. How long would it take his father to build it alone? days hours

*asked on October 9, 2019* -
## Algebra

The Patterson family and the bell family each used their sprinklers last summer. The wayer output rate for the patterson family's sprinkler was 25 L per hour. The water output rate for the bell family's speinkler was 15 L per hour. The familiez used their

*asked on July 26, 2016* -
## Physics

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a.

*asked on December 20, 2015* -
## Math

Suppose that a graphing calculator is programming to generate a random natural number between 1 and 10 inclusive . What is the probability that the number will be prime?

*asked on July 10, 2015* -
## statistic****help*****

if three coins are tossed, what is the number of equally likely outcomes? 3 4 6 8 9

*asked on March 19, 2014* -
## help please English

If this be error and upon me proved/ I nevered writ, nor no man ever loved." What is the impact of these concluding lines from shakespeare's sonnet 116? 1. They underscore the fact that everyone makes mistakes 2. They underscore the fat that shakespeare is

*asked on December 22, 2013* -
## Math

Solve the literal equation for a y=x(ab/a-b)

*asked on October 10, 2013* -
## Math

Stacey drew a triangle on a coordinate plane. She wrote down the ordered pair for each vertex. How many ordered pairs did she write down?

*asked on February 27, 2013* -
## spanish

1. Voy de vacaciones y primero necesito (conﬁrmar el vuelo / pasar por seguridad) para viajar. 2. Voy a Dallas y luego vuelvo a Miami. Necesito un boleto (de ida y vuelta / de ida). my answers 1. confirmar el vuelvo 2. de ida y vuelta

*asked on September 24, 2012* -
## science

how to make an acrostic for biology?

*asked on September 1, 2012* -
## physics

You have a tuning fork of unknown frequency. When you ring it alongside a tuning fork with known frequency of 360 Hz, you hear beats at a frequency of 10 Hz. When you ring it alongside a tuning fork with known frequency of 347 Hz, you hear beats at a

*asked on April 21, 2012* -
## physics

Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the electric force between them.

*asked on April 14, 2012* -
## STATS

At an outpatient mental health clinic, appointment cancellations occur at a mean rate of 1.60 per day on a typical Wednesday. Let X be the number of cancellations on a particular Wednesday. a) What is the probability that no cancellations will occur on a

*asked on October 30, 2010* -
## college

A volume of 25.0 ml of 0.100 M CH3CO2H is tiltrated with 0.100 M NaOH. What is pH after the addition of 12.5 mL of NaOH? (Ka for CH3CO2H = (1.8 x 10-5)

*asked on October 20, 2010* -
## physics

Suppose the amount of heat removed when 3.0kg of water freezes at 0 degree C were removed from ethyl alcohol and its freezing/melting point of -114 degree C. How many kilograms of ethyl alcohol would freeze? PLEASE GIVE ME SOME HINTS!!!THANKS A LOT!!!!

*asked on February 10, 2008* -
## chemistry

How many miles of vapor are formed when 10 liters of butane gas, C4H10 is burned in oxygen at STP?

*asked on June 11, 2020* -
## Algebra

Solve: please include statement and reason Given: ΔАВС, m∠ACB = 90° CD ⊥ AB, m∠ACD = 30° AD = 6 cm. Find: BD

*asked on June 4, 2020* -
## Algebra

Represent the following expressions as a power of the number a (a≠0): (a^2a^4)÷a^−3/a÷(a^2a^3)^4

*asked on May 31, 2020* -
## Algebra

Use the given D to find the range of each function: f(x)=x−4, D={−2, −1, 3}

*asked on May 27, 2020* -
## Algebra

Represent the following expressions as a power of the number a (a≠0): ((a^2)^−2)^5÷(a^4·a)^3

*asked on May 20, 2020* -
## Algebra

Solve for x: a(x−b)+bx+c=a, if a≠−b, if a ≠ − b

*asked on April 10, 2020* -
## Algebra

Given that x and y are positive integers and (x·2)+x(2^2)+(y·2^3)+(y·2^4)=42, what is the value of xy?

*asked on March 31, 2020* -
## Algebra

Prove that, 36^7−6^13 is divisible by 30.

*asked on February 18, 2020* -
## Algebra

(−2x^2yz^2+3x^2y)·(−5y^2z^3−4z)·(xy^2+z)

*asked on February 13, 2020* -
## Algebra

Prove the divisibility of the following numbers: 12^8·9^12 by 6^16

*asked on February 4, 2020* -
## Algebra

Prove that: (12^13–12^12+12^11)(11^9–11^8+11^7) is divisible by 3, 7, 19, and 37.

*asked on January 14, 2020* -
## Algebra

Write the expression as a cube of a monomial. – 8/27a^15

*asked on October 28, 2019* -
## Algebra

A vendor sells h hot dogs and s sodas. If a hot dog costs twice as much as a soda, and if the vendor takes in a total of d dollars, how many cents does a soda cost?

*asked on October 28, 2019* -
## @Ms.Sue please help!!:(Math

Sound intensity is inversely proportional to the square of the distance from the sound source; that is I= k/ (r)^(2), where I is the intensity, r is the distance from the sound source, and k is a constant. Suppose that you are sitting a distance R from the

*asked on April 17, 2017* -
## Algebra 2

Simplify, (2 sqrt3x^5 - 2sqrt y)^2

*asked on January 17, 2017* -
## Algebra 2

Write as a sqrt, 2^3/2 x^3/2 y^5/2

*asked on January 17, 2017* -
## Reading

The West Wind It’s a warm wind, the west wind, full of birds’ cries; I never hear the west wind but tears are in my eyes. For it comes from the west lands, the old brown hills, And April’s in the west wind, and daffodils. It’s a fine land, the west

*asked on May 11, 2016* -
## Geometry

A square pyramid has a surface area of 175 square inches. The square base has side lengths of 5 inches. Find the slant height of the pyramid.

*asked on April 6, 2016* -
## Reading

Ernest Hemingway's first job was as a newspaper writer in Kansas, at the age of 17. He wrote about everything that happened at the local police station, the train station, and the hospital. Hemingway worked for the newspaper for six months. The Red Cross

*asked on February 2, 2016* -
## math

How can $12,600 be split between two investments, one paying 6% annually and one paying 8% annually so that the interest from the two accounts equals $864

*asked on October 21, 2015* -
## Gr.11 Biology

In guinea pigs, black cot is dominant to albino. Rough coat us dominant to smooth coat. A black smooth guinea pig was mated with an albino rough guinea pig. Their offspring were black rough and black smooth. If these were the only produced over a period of

*asked on October 6, 2015* -
## English

What is wrong with this sentence? Although they seemed inflamed, the site of the previous craniectomy seemed free of defect.

*asked on May 19, 2015*