Posts by Sara
Total # Posts: 4,603

Chemistry
Calculate molarity 9.8g r 500 ml 
Calculus
Consider the functions A(x, y) = x^2y + xy ? 3xy^2, and B(x, y) = xe^xy ? y. (a) Calculate the x derivative of A, or Ax. (b) Calculate the y derivative of A, or Ay. (c) Calculate the x derivative of B, or Bx. (d) Calculate the y derivative of B, or By. 
math
Christina finances a piano for $3,070 by taking out an installment loan for 24 months. The payments were $153.50 per month and the total finance charge was $614. After 14 months, Christina decided to pay off the loan. After calculating the finance charge rebate, find her loan ... 
math
Scott purchases a piano costing $2,630 by taking out a 13% addon interest installment loan. The loan requires a 15% down payment and equal monthly payments for 5 years. How much are Scott's monthly payments? 
math
You purchase a hot tub costing $4,600 by taking out a 13% addon interest installment loan. The loan requires a 15% down payment and equal monthly payments for 4 years. How much are your monthly payments? 
Math
Okay so it is 1/4 
Math
Given that g is the inverse function of f, and f (3) = 4 , and f ?(3) =5 , then g?(4) = 1/5 3/5 3/5 
physics
Determine the x and y components of the following three vectors in the xy plane. 1) A 19m/s velocity vector that makes an angle of 40° counterclockwise from the x direction. x: 2) y: Explain please! 
Chemistry
hydrobromic acid (50.5) calculate the concentration in mol/L. (MW HBr: 80.91 g/mol, density: 1.49 g/mL) 
Computer science C++
3. After following statements have executed, find the value of the variable a. int a=5; while (a<20) ?a=a+3; 4. After following statements have executed, find the value of the variable a. int a=0; while (a<12) ?a++; 5. After following statements have executed, find the ... 
Math
Jason was hired to mow a lawn that covers an area of 2 3/4 acres it took him 4 1/8 hours to complete the job what was his unit rate and hours per acre you multiply the numerator and a complex fraction by the reciprocal of the denominator to calculate our unit rate involving ... 
math
An object is dropped from a balloon 3600 feet above the ground. Find the time it takes to reach the ground if the height of the object is given by the equation h(t) = –16t^2 + 3600 
Math
The length of a rectangle is three times as long as its width. Its area is 675 square feet. a. Write an equation that demonstrates the given information. b. Find the dimensions of the rectangle. 
history
I think its 1 but I'm not sure 
history
Which of the following best applies to religion in the High Middle Ages? 1. Pilgrimages to holy shrines declined as the practice of indulgences increased 2. The Bible was translated and widely read in the vernacular (every day, spoken) languages 3. The popular interest in ... 
math
Determine whether ?QRS is a right triangle for the given vertices. Explain. Q(18, 13), R(17, –3), S(–18, 12) 
History
1. In the Lindisfarne Gospels, what symbol represents St. Mark? (The Winged lion?) 2. In the Lindisfarne Gospels, who is the only evangelist who is pictured facing the reader directly? (I think its John) 3.In the Book of Kells, how many evangelists are presented as actual men... 
math
Determine whether ?GHI is a right triangle. G(2, 1), H(3, 1), I(4, 4). Can you please show the steps too? Thank you! 
history
It says that AlAndalus is another name for the Iberian peninsula 
history
is it AlAndalus? 
history
is it Reconquista? 
history
Which European country was controlled by Muslims throughout the Middle Ages, and what year did Christian rulers finally take power away from the Muslims? 
math
The vertices of a triangle are L(1,3), M(4,0), N(4,1) LO is a median of the triangle. What are the coordinates of point O? Explain. 
math
Thank You 
math
The value of Sara's new car decreases at a rate of 8% each year. 1.Write an exponential function to model the decrease in the car's value each month. 2.Write an exponential function to model the decrease in the car's value each week. 3.Write an exponential function... 
English
How to reword this please? The Emmett Till Unsolved Civil Rights Crimes Reauthorization Act of 2016 will be considered by the House on Wednesday, December 7. under the rules. S. 2854 was proposed on April 26, 2016, by Senator. Richard Burr Republican of North Carolina and ... 
English
How can I reword this to start my summary ? On Wednesday, December 7, 2016, the House will consider S. 2854, the Emmett Till Unsolved Civil Rights Crimes Reauthorization Act of 2016, under suspension of the rules. S. 2854 was introduced on April 26, 2016, by Sen. Richard ... 
Math
Give the domain and range of the following functions: f(x) = 1?4x – 7 g(x) = 3x2+ 2 
math
2/5x9<9/10 
Exponential and Logarithmic functions
Thank you 
Exponential and Logarithmic functions
A certain material decays at a rate of 1.9% per year. The sample is 260 grams. How much will be left in 11 years? How long will it take to have only a 100g sample left? 
Opreating System
Hi, i need help with this opreating system homework. Part 1: you need your C program to do the following in order to achieve this desired output. (1) navigate the subfolders of the proc folder looking for those folders holding information about processes in the system. ... 
Opreating System
Hi, i need help with this opreating system homework. Part 1: you need your C program to do the following in order to achieve this desired output. (1) navigate the subfolders of the proc folder looking for those folders holding information about processes in the system. ... 
Math
For the following geometric sequence find the recursive formula and the 5th term in the sequence. In your final answer, include all of your work. {4, 12, 36, ...} 
Biology
What is a protein that transports ions across the plasma membrane without requiring energy or changing shape? 
math
i used to take that material last year ,now i forgot it, sorry 
math
its more physics than math, anyways, i guess but im not sure since patrick left after 30 min, u need to add 30 min on johns arrival time. 
math
sorry john 
math
velocity=distance/time to find the time patrick reached 
psychology
does someone know a good website that includes b.f. skinner in behavioral approach ,or just inform about him? 
Math! Please Help It's Due Today!!!!!
and then you substitute the point and u'll find b then m+b=* hope im correct 
Math! Please Help It's Due Today!!!!!
i used to know but now i forgot but i guess i may help you on that if two lines are perpendicular their slope product = 1 line 1:y=5/8 x9 a1 x a2 =1 5/8 x a2 =1 a2=8/5 line2: y= 8/5 x +b 
MATH
A prism has a cross section that is a right angled triangle.its volume is 60 cm^3.What could the dimensions of prism be? 
maths
Aprism has a cross section that is a right angled triangle.Its volume is 6 cm^3.What could the dimentions of this prism be ? .....cmby..........cmby.....cm(2) 
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 x2 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 breastfeeding 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+84=28 2x^2+8x+4=28 2x^2 +8x24=0 none of them still work 
math
This is a multiple choice question. What is the solution of the equation 2(x+2)^24=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+164=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
Thankyou. 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^x2)=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) g1(superscript) (f(x)) c) g(f(x)) +g1(superscript)(f(x)) 
math
log(subscript)2 (x+5) + log(subscript)2 (x1) =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^x2)=8^2x+1 
math
15(5x2)=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  cosx3 =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 f1(x) are both defined for xer. give a geometric interpretation of the composite function y=f(f1(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?