# Posts by SAra

Total # Posts: 4,470

**MATH 2**

Elisabeti bikes from home to the grocery store and back to pick up in- gredients. On the way to the store, she averages 15 mph. Encumbered by groceries, she averages 10 mph on the way back. What is her average speed for the whole hour?

*March 26, 2017*

**MATH**

Morwen bikes around his neighborhood for an hour. He averages 15 mph for the first 40 minutes, but then he tires and averages 10 mph for the last 20 minutes. What is is his average speed for the whole hour?

*March 26, 2017*

**math**

Find two fractions in lowest terms with unequal denominators whose difference is 2/7?

*March 26, 2017*

**math**

Sasha is a female my mistake

*March 25, 2017*

**math**

In one minute, Sasha takes 43 steps. It takes her 301 steps to travel from her house to the shops. If she leaves home at 10:24,at what time will he reach the shops if he walks steadily?

*March 25, 2017*

**Advanced Functions**

The number of bicycles, n, sold at one store in a week is a function of the price, p, in dollars. So n(p) for p > 80. The storeÃ¢â‚¬â„¢s cost, c, in dollars for each bike is a function of the number of bikes the store sells each ...

*March 24, 2017*

**math- factoring**

Thank you. I was getting thrown off since the bx is +bx and since x=-13 I wasn't sure if you would change the sign to +13 since the bx was positive.

*March 19, 2017*

**math- factoring**

The question is ax^2+bx+c=(2x-7)(x-3) for all values of x, What is the value of b? The teacher went over and said the answer is -13, but I am not sure how she got that. Can you please explain. Thank you! I did the first part (2x-7)(x-3) 2x^2-6x-7x+21 2x^2-13x+21 here x=-13 but...

*March 19, 2017*

**Advanced Functions**

Nadia collected the data in the table on the left using a CBR after a ball was dropped. (a) Enter the data into L1 and L2 using a TI-83 Plus. Graph the relation. (b) Without looking at the graph, how do you know that the relation is not linear? (c) Use regression to find the ...

*March 19, 2017*

**Linear algebra**

Let L1 be the line passing through the point P1=(?1, ?1, 8) with direction vector ?d1=[1, 0, ?3], and let L2 be the line passing through the point P2=(7, ?11, 14) with direction vector ?d2=[1, 2, ?3]. Find the shortest distance d between these two lines, and find a point Q1 on...

*March 18, 2017*

**Algebra**

I have found d, my problem is finding Q1 and Q2 and if you don't want to help it's better not to say anything at all I know how to google thanks!

*March 18, 2017*

**Algebra**

can somebody please help me with this question I've spent more than 3 hours on this, still nothing Let L1 be the line passing through the point P1=(2, ?4, ?6) with direction vector ?d1=[1, 0, 2]T, and let L2 be the line passing through the point P2=(?2...

*March 18, 2017*

**Calculus**

A bowl is created with circular cross sections so that its radius (in cm) is a function of height (in cm) according to the equation r=4sqrt(h+1). Find the volume of soup that fills the bowl if the bow is 2 cm high.

*March 15, 2017*

**Physics**

A thin-walled sphere rolls along the floor. What is the ratio of its translational kinetic energy to its rotational kinetic energy through its center of mass?

*March 13, 2017*

**MATH**

1. Show, from the definition, that if A:B::C:D and C:D::E:F then A : B :: E : F.

*March 13, 2017*

**HELP MATH**

Mr. Kwon has just enough money to buy only 20 mangoes or only 30 oranges. If he wants to buy equal numbers of mangoes and oranges together, how many of each type can he buy with the money?

*March 13, 2017*

**Math**

Mr. Dinkelspiel bought $32.56 worth of stamps. He bought 20 more 19-cent stamps than 50-cent stamps. He bought twice as many 32-cent stamps as 19- cent stamps. How many of each kind did he buy?

*March 12, 2017*

**Math**

Mr. Kwon has just enough money to buy only 20 mangoes or only 30 oranges. If he wants to buy equal numbers of mangoes and oranges together, how many of each type can he buy with the money?

*March 12, 2017*

**physics**

a car is driving at 95 km/h down a highway when a deer runs infront of the car 80 m ahead. if the driver immediately applies the brakes and slows down at 4.2m/s^2, what happens?

*March 10, 2017*

**math**

-7<x-5<2

*March 8, 2017*

**math**

curcumference is 2(pi)r 62.8=2(pi)r r=9.995 A=2(pi)rh+2(pi)r^2 =[2*(pi)*(9.995)*60]+[2*pi*(9.995^2)] about 4396 cm^3 OR 43.96 m^3

*March 8, 2017*

**Physics**

A steel beam that is 7.00 m long weighs 352 N. It rests on two supports, 3.00 m apart, with equal amounts of the beam extending from each end. Suki, who weighs 595 N, stands on the beam in the center and then walks toward one end. How close to the end can she come before the ...

*March 8, 2017*

**Math**

I am six years older than my sister. In five year, her age will be 5/6 of my age then. How old is she today?

*March 7, 2017*

**Math**

A large glass of juice contains a mix of half mango juice and half pumpkin juice. A smaller glass contains pure pumpkin juice. If the two glasses are combined in a pitcher, the result will be 60% pumpkin juice. The volume of the small glass is 4 ounces; what is the volume of ...

*March 7, 2017*

**math please check**

208

*March 6, 2017*

**Algebra 1**

y=9.1x inverse: x=9.1y

*March 6, 2017*

**math**

48.4 (9-2)^2+(-3/5) 49+(-.6)

*March 6, 2017*

**Physics**

A flywheel turns through 60 rev as it slows from an angular speed of 2.8 rad/s to a stop. How much time is required for it to complete the first 30 of the 60 revolutions?

*March 6, 2017*

**Physics**

What is the linear acceleration of a point on the rim of a 38 cm-diameter record rotating at 33 1/3 rev/min?

*March 6, 2017*

**physic**

If an erect person's systolic pressure is measured at 120 mm-Hg at the level of heart, please calculate the arterial systolic blood pressure in the head of this person (in the unit of mm-Hg). Assume that the head is 50 cm above the heart (the density of blood is 1050 kg/m...

*March 5, 2017*

**bio**

Imagine you are purifying a protein which accounts for 0.001% of the total protein within a cell. How many steps of purification are required to yield pure protein, assuming a 10 fold purification with each step of purification?

*February 26, 2017*

**math**

1.The cost of a telephone call from Wilsonto East Meadow is $0,60 for the first three minutes plus $0.17 for each additional minute. What is the greatest number of whole minutes of a call if the cost cannot exceed $2.50? 2.When John bought his new computer, he purchased an ...

*February 26, 2017*

**Math**

Bart is saving to buy a flat screen monitor that costs $345. He has already saved $37. What is the least amount of money Bart a must save each week so that at the end of 11 weeks he has enough money to buy the monitor?

*February 26, 2017*

**Chemistry**

Determine the concentration for the following solutions 2.0g KOH is dissolved in water to make 200.0 ml of solution

*February 23, 2017*

**Math**

When a class took a math test, 15% of the class failed, 25% made some mistakes (but didn’t fail), and 24 students got perfect scores. How many students were in the class?

*February 23, 2017*

**Math**

One of the sides of a parallelogram is 4.2 cm and the altitude to that side is 3.6 cm. Find the perimeter of the parallelogram if the altitude to the other side is 2.4 cm.

*February 23, 2017*

**Math**

The area of a parallelogram with a side of 5.6 in is equal to the area of a rectangle with sides 7 in and 8 in. Find the altitude to the given side in the parallelogram.

*February 23, 2017*

**biology**

A bacterium has a genome size of 6.0 X 106 base pairs. There is one Origin of Replication (ORI) and each DNA polymerase catalyzes the addition of 1,000 nucleotides/second. How much time is needed to replicate the entire genome?

*February 20, 2017*

**Molarity question!! please help urgently!**

Suppose you wanted to produce an aqueous solution of pH = 8.70 by dissolving one of the following salts in water: NH4Cl, KHSO4, KNO2, NaNO3. Use salt KNO2. But at what molarity? Please help!! Thank you!

*February 17, 2017*

**Equilibrium concentrations, please help!!!**

Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)?Pb2+(aq)+2Cr2+(aq). KC=3.2×10?10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the...

*February 17, 2017*

**science, chemistry**

Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)?Pb2+(aq)+2Cr2+(aq). KC=3.2×10?10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the...

*February 17, 2017*

**Math**

The total cost of producting x radio sets per day is (1/4x^2 + 35x + 25) dollars. The price per set at which they may be sold is ( 50 -1/2x) dollars. What should be the daily output be to obtain the maximum profit? Help!!!

*February 9, 2017*

**Algerbra**

Thank you!

*February 8, 2017*

**Algerbra**

Please help! Find the vertex of f(x)=x^2+2x-3 Find the vertex of f(x)=x^2-3x+1

*February 8, 2017*

**English**

Thanks Mr.Bob

*February 8, 2017*

**English**

Which option best describes a main idea of "Kuba Khan" Society tends to fear creative people Creative people are welcome in society Society tends to love creative people< Hail is a problem in many societies

*February 8, 2017*

**Sara**

I'm reading different... maybe it's C

*February 8, 2017*

**English (sorry)**

I think it's B.

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Determine a,b and c so that curve y= ax^3 + bx^2 + cx will have a slope of 4 at its point of inflection (-1,-5) Help please!

*February 8, 2017*

**Math**

Fine the max or min points and the points of inflection for the function y=3x^4 - 10x^3 - 12x^2 + 12x - 7 Can someone help me!!!

*February 7, 2017*

**Math**

Find the critical points, and the points of inflection y= (x+1)^2/x Help me please!!!

*February 6, 2017*

**Algebra **

what are the coordinates of the vertex of f(x)=-x^2+6x-9 (0,-9) (3,-9) (3,0) (6,0) How do I figure this out?

*February 6, 2017*

**ELA**

A just took the quiz it is 1. A 2. C 3. B 4. D 5. C I hope this helps!

*January 31, 2017*

**Math (Elementary Linear Algebra)**

Find the general flow pattern of the network. 20<---A |\B__>x(4) |/ 80<---C I believe the system of equations for A,B,&C is-A: x(1)+x(3)=20 B: x(2)=x(3)+x(4) C: 0=x(1)+x(2) Assuming flows are all nonnegative, what is the largest possible value for x(3). Sorry, this ...

*January 31, 2017*

**Math**

I set up the equation like you said 11+.21m =20+.10m -.10m. -.10m 11+ .11m =20 -11. -11 .11m/.11=. 9/.11 This doesn't seem correct

*January 18, 2017*

**Math**

Verizon has two different cell phone plans. The cost, Y, of plan A is $11 a month Plus $.21 per minute. The cost, Y, of Plan B is $20 a month plus $.10 per minute. After how much time to the nearest minute will the cost of plan a B equal to the cost of Plan B? Can you help me ...

*January 18, 2017*

**PE**

Which is correct?

*January 18, 2017*

**PE**

I took the test and Dairy is correct, if you look at my plate it says the same :)

*January 18, 2017*

**math**

For what values of r does the function y = erx satisfy the differential equation y'' ? 6y' + 3y = 0?

*January 12, 2017*

**Math discussion**

yea thanks Katie you are really a big help! i just did my discussion and pass it! Katie you are the best. Again thank so much!

*January 5, 2017*

**Percentage**

A flat-screen TV costs $1,400. The TV is on sale for 35% off. What's the discount price?

*January 4, 2017*

**Presentation**

Why is coffee bean good

*December 25, 2016*

**math**

thank you for your help

*December 21, 2016*

**math**

Justin has an I-tunes gift card worth $125. after he downloads his first app, the cards value is $118.01. after he downloads his second app, the cards value is $111.02. after he downloads his third app, the i-tunes gift card is worth $104.03. Justin wants to download as many ...

*December 21, 2016*

**elementary school**

what do I do when there is an equation like 15/4 divided by 9/1 how do I do that since 9 cant go into 15 evenly

*December 21, 2016*

**math**

THERE ARE ESTIMATES OF THE MARGIN OF ERROR FOR CONFIDENCE LEVELS OTHER THAN 95%. FOR A 90% CONFIDENCE LEVEL AND A SAMPLE SIZE N, THE MARGIN OF ERROR IS APPROXIMATELY 82/N%.SUPPOSE WE WISH TO HAVE A MARGIN OF ERROR OF 1% WITH A 90% CONFIDENCE LEVEL. APPROXIMATELY HOW MANY ...

*December 19, 2016*

**MATH**

What percentage of adult males in America are under 5 feet 7 inches tall?

*December 19, 2016*

**Health**

From beans! They are a pure protein. So C would be your correct answer.

*December 14, 2016*

**math**

Drawing 5 cards out of 13 cards numbered 1 to 13 without replacement, what is the probability of having a sum greater than 40 ?

*December 11, 2016*

**Physics**

consider the circuit in the figure. find the current in the 13 ohm resistor. Answer in units of A

*December 7, 2016*

**english**

Can someone help me write a 8 line poem about Romeo and Juliet

*December 6, 2016*

**math**

Compare -8 ? 10. Use <, >, or =.

*December 5, 2016*

**Stats**

A dean wishes to estimate the average cost of the freshman year at a particular college correct to within $500, with a probability of 0.95. If a random sample of freshmen is to be selected and each asked to keep financial data, how many must be included in the sample? Assume ...

*December 5, 2016*

**Math**

Jessica has been given a list of 4 bands and asked to place a vote. Her vote must have the names of her favorite and second favorite bands from the list. How many different votes are possible?

*December 4, 2016*

**Math**

Two parallel lines are cut by a transversal Suppose m?438° Find m?6 and m?7 * m?6 and m?7 are corresponding angles *

*December 4, 2016*

**History**

What did the Edict of Nantes do for their culture?

*December 4, 2016*

**History**

Thank you :)

*December 4, 2016*

**History**

What did the Edict of Nantes do for the Economy?

*December 4, 2016*

**Maths**

A number consists of two digits.THe digit in tens place is twice that in units place.if 18 is subtracted from the number. The digits are reversed.find the number.

*December 4, 2016*

**Maths**

divide 1000 among a,b,c in such a way that a gets 120 more than b and b gets rs 110 more than c .hw much each get

*December 4, 2016*

**Maths**

50 divided into two parts such that if 6 is subtracted from one part , 12 is added to the second part we get same number .

*December 2, 2016*

**math**

The radioactive decay of a substance is expressed by A=A^0 e^ -kt, where the initial amount A^0, decays to an amount A after t years. The positive constant k differs for each substance. Strontium 90 decays such that k=.028. Find out how much of 1,000 mg of strontium 90 remains...

*December 1, 2016*

**chemistry**

why is the spectrum of hydrogen composed of discrete lines?

*November 29, 2016*

**Math**

The figure below shows two triangles. Which statement about the triangles is true? i.imgsafe(.)org/c60dcd0488(.)jpg The triangles can be proven congruent by: 1. Angle angle side <<< 2. Angle side angle 3. Side angle side 4. The triangles cannot be proven congruent

*November 28, 2016*

**Algebra**

Chandra has 2 liters of a 14% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of a 34% solution?

*November 28, 2016*

**algebra**

Shari drove for 90 miles in the city. When she got on the highway, she increased her speed by 20 mph and drove for 130 miles. If Shari drove a total of 4 hours, how fast did she drive in the city?

*November 27, 2016*

**algebra**

Bob needs to wash the windows on his house. He has a 25-foot ladder and places the base of the ladder 10 feet from the wall on the house. How far up the wall will the ladder reach?

*November 27, 2016*

**math**

Solve the quadratic equation, 2 x2 - 5 x+3

*November 27, 2016*

**Math (please check my answer!!)**

What other information is needed to prove that the two triangles congruent by SAS? Picture description: there are two triangles showing line LT = line MQ and L=M A. <T = <Q B. <G = <N C. Line GT = line NQ << D. Line LG = line MN

*November 22, 2016*

**Biology (please help!!)**

Explain the process that takes place in the stroma including and reactants going in nd the products produced from these processes in a. bright sunlight and in b. darkness. c. what happens over an extended period of darkness of many days? What I need to know is part C.. I have ...

*November 21, 2016*

**math**

Can you please help with finding rate of change in graphing? One question has times: 0 15 23 30 35 distance:30 70 0 45 60 Can you help me get started, I don't know what to do? Also, in another question for the slope I have to find which line has greatest absolute value ? ...

*November 20, 2016*

**Government**

What is the role of joint chiefs of staff? A.To serve as objective military advisors B.To manage the executive office of the president << C.To lead the department of Defense << D.To lead the state Department I'm not sure if it's B or C, I do lean more ...

*November 18, 2016*

**math**

Estimating the product of a decimal and a whole number what is 8.02 x 70

*November 17, 2016*

**math**

What is the estimated answer of 0.97x312

*November 17, 2016*

**Physics**

Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in the figure to pull it out. (a) What force in newtons would you have to exert perpendicular to the center of a rope to produce a force of 10,000 N on the car if the angle is 1.80°? ...

*November 7, 2016*

**MATH**

If y varies inversely with x and y = 8 when x = 5, then what is y when x = 2? 4 6 10 20

*November 5, 2016*

**Math**

A store buys shirts for $12 each and marks up the price by 25%. What is the price for a shirt at this store?

*November 1, 2016*

**Math**

V varies inversely with T and V = 12 when T = 6. Which equation shows this relationship? V = 2T V = 72T--- My Answer v=2/T V=72/T

*October 27, 2016*