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Posts by SaRa

Total # Posts: 4,533

Physics
an object of mass m is being weighed in an elevator that is moving upward with an acceleration a. What is the eesult if the weighing is done using a spring balance and a pan balance?

Math
How would I go about solving y - 6 is greater than or equal to = 12?

Math
y + 5 is equal to or greater than 7 Is y less than or greater than 12? Please check, and help correct.

Math
x/4 + 1 = -6 I'm not sure the process to solve the equation, could I have help?

physics
If 335 g of water at 65.5 °C loses 9750 J of heat, what is the final temperature of the water? Liquid water has a specific heat of 4.18 J/(g.°C). °C (Answer a number only, no units. Round to the tenth place). This is an example of an endothermic or exothermic ...

algerbra
can someone check my work for this question? the question is to graph the function of square root of x plus 2 with the plus 2 not being in the square root my x values were 0,1, 4, 9, and 16 my y values were 2, 3, 4, 5, and 6 the next part says to write the domain and range. ...

algerbra
can someone check my work for this question? the question is to graph the function of square root of x plus 2 with the plus 2 not being in the square root my x values were 0,1, 4, 9, and 16 my y values were 2, 3, 4, 5, and 6 the next part says to write the domain and range. ...

math
yes, that's what I have. Thank you for checking my work!!

math
The question is: the table below lists the total cost for parking for a period of time on the street in NYC. The total cost for any time up to and including the hours parked. For example, parking up to and including 1 hour would cost $1.25; for 3.5 hours parking would cost $5....

Algebra
Ms. Sue, I'm sorry! I got these answers for those problems. :\ I didn't post the choices and my answers cause I thought it'd be too much work... 1. x^2 - 12x + 1 2. -4x^2 - x + 15 3. 2x^2 + x + 9 5. m^2 - 2m - 9 6. 14t- 8 9. 64^50 10. x^7 11. 4^36 12. 4^48 14. 1/27...

Algebra
I have a few of these questions that I need help on, please help me! 1. 16x^2 + 2 + 2x - 15x^2 - 1 + 14x 2. 2x^2 + 8 8 - 4x + 3x - 6x^2 + 7 3. 2x^2 = 6x - 7x +8 - 3x^2 + 1 5. (m^2 - m - 4) + (m - 5) 6. (5x^2 + x - 3) - (-2x^3 + 4) 9. 64^10/64^5 10. x^11/x^4 11. 4^3 x 4^12 12. ...

math
On the set of axes below, graph the function represented by y=cubed root of x-2 for the domain -6< or equal to x< or equal to 10. x column I did -6, 1, 2 , 3 ,10 y column I did -2, -1, 0, 1, 2 Then I plotted these points. Is this correct? Thanks for checking over my work.

Math
An employee earns $200 for 14 hours work. Assuming he is paid by the hour, how much will this employee earn in 35 hours?

math
my watch is twelve minutes slow .the bus for which I am waiting should have arrived at 3.49pm but it is five minutes late. What time would my watch show when the bus arrives?

geometry
Find the lateral area of a regular square pyramid whose slant height is 20 and whose base has an edge length of 7

statistics
Recent studies, as summarized, for example, in E. Mortensen et al. (2002). The association between duration of breastfeeding and adult intelligence. Journal of the American Medical Ass o ciation , 287 , 2365–2371, suggest that breast-feeding of infants may increase their...

Math
If <1 and <2 are supplementary, then <1 and <2 form a linear pair

Math
If <1 and <2 are supplementary, then <1 and <2 form a linear pair

statistics
The professor teaching a large introductory class gives a final exam that has alternate forms, A, B, and C. A student taking the exam using Form B is upset because she claims that Form B is much harder than Forms A and C. Discuss how percentile point data might be useful to ...

math
ok, corrected is 2x^2+4x+4x+8-4=28 2x^2+8x+4=28 2x^2 +8x-24=0 none of them still work

math
This is a multiple choice question. What is the solution of the equation 2(x+2)^2-4=28 1)2 only 2)6 only 3)-2 and 6 4)2 and -6 I did (2x+4)(2x+4)-4=28 4x^2+8x+8x+16-4=28 4x^2+16x+12=28 4x^2+16x=16 This is where I get stuck, can you help? thank you

math
thank you so I got 45.95, so approx. 46mph, which is still over the speed limit. Thank you for taking the time to check my long involved problem.

math
The equation d=0.12v^2 + 2.1v models the distance d in feet it takes a car traveling at a speed of v miles per hour to come to a complete stop. Graces car was able to stop after 350ft on a highway. If the speed limit in the area was 35 miles per hour, was she speeding? Justify...

Math
Michael can travel at 166.35mph in his Ferrari. How far can he travel in 5 hours?

Math
Colin lived in Scotland and was going to take his caravan on holiday to France. On the first day he travelled 472.87 miles to Portsmouth. He got a ferry which travelled 73.92 miles. He then got off the ferry and drove 134.56 miles to the camp site. How far did Colin travel to ...

9th grade English
Thank-you. I guess I shouldn't complain but I want to challenge myself

9th grade English
Sam had to mix __________ parts of the two chemicals for the experiment. a. equaled b. equitably c. equal d. equate f. equation I pick C This seems to easy am I missing something?

Story section
Imagine you are an old ragged doll.You have just been thrown away by your owner.Tell the story of what happens to you. Please at least write 4 or 5 sentences to make a start Thank you

Logic
Thanks

Logic
Which of the following is not like the others? A. 1 B. 22 C. -2 D. 50 E. -94

Logic
Thank you

Logic
Which of the following is not like the others? A. Mars B. Venus C. Asparagus D. Potatoes E. Computers F. Cheeses G. Chairs H. Pasta

Maths
A boy spends 1/4 of his money on sweets and 1/3 on computer games. What fraction of his money does he not spend?

Trigonometry
The first three terms of an arithmetic progression are 1/2, x, 25. The first three terms of a geometric progression are x+1/4, 32 1/2, and y, where x and y are positive numbers. Find the value of X and the value of Y.

MATH
Jenny is running an experiment for organic chemistry class. She needs exactly 100 ml of 70% hydrochloric acid, but the lab only has 90% and 40% solutions. How much of each solutions does she need to mix in order to obtain 100 ml of 70% hydrochloric acid solution?

Math
What is 7 to the nearest hundred?

MATH!!
There are two numbers whose sum is 50. Three times the first is 5 more than twice the second. What are the numbers?

math
15(5^x-2)=8^2x+1 extraneous root sorry for the re post, i typed it wrong

math
given f(x) = x^2 and g(x)= squar root x+4. determine the following compostions and their doamin and range a) f(g(x)) b) g-1(superscript) (f(x)) c) g(f(x)) +g-1(superscript)(f(x))

math
log(subscript)2 (x+5) + log(subscript)2 (x-1) =4 find the extraneous root

math
The pH or acidity of liquid is measured in pH, where pH is given by the equation pH=- log C, with C being the concentration of [H+] in multiples of M=1mol/L. Suppose you are given a solution of hydrochloric acid with a pH of 1.7 and asked to increase the pH solution by 1.4. ...

math
opss i typed it wrong 15(5^x-2)=8^2x+1

math
15(5x-2)=82x+1 solve the extraneous root

math
A polynomial function function is defined by the equation p(x)=3x3+ax2+bx+7, where a, bE/. If p(-2)=5 and p(1)=14 then the value of a+b is...

Advanced Functions
4cos2x - cosx-3 =0 0 to 2pi

chemistry
The pH or acidity of liquid is measured in pH, where pH is given by the equation pH=- log C, with C being the concentration of [H+] in multiples of M=1mol/L. Suppose you are given a solution of hydrochloric acid with a pH of 1.7 and asked to increase the pH solution by 1.4. ...

Advanced Functions
the compound interst forumla is A= P(1+i)^n. consider the function in the form of y= 100(1+x/2)^20, where y is the compound amount. a) determine the required annual interest rate of investment to the nearest tenth of a percentage of 10 years that will give an amount of $300 b...

statistics
the percentage increase in price of four items from what they did a year earlier is 72,108,36 and 96 what is the average percentage increase in price of the four items

physics
suppose a car is driven from town A to town B from town B to town C and from town C to town D which have equal distances at average speeds 20km/hr,60km/hr and 120km/hr respectively,what is the average speed for the whole journey

Advanced Functions
assume the function f(x) and its inverse f-1(x) are both defined for xer. give a geometric interpretation of the composite function y=f(f-1(x))

Percentage
If Safia have 10 percent more cookies than Rohit, how many percent fewer cookies does Rohit have than Safia?

help math!
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?

help with 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?

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?

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?

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

math
Sasha is a female my mistake

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?

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 store’s cost, c, in dollars for each bike is a function of the number of bikes the store sells each ...

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.

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...

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 ...

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...

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!

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...

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.

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?

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

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?

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?

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?

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?

math
-7<x-5<2

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

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 ...

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?

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 ...

math please check
208

Algebra 1
y=9.1x inverse: x=9.1y

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

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?

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?

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...

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?

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 ...

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?

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

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?

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.

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.

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?

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!

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...

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...

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!!!

Algerbra
Thank you!

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

English
Thanks Mr.Bob

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

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

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