Posts by lauren

Total # Posts: 1,851

Math
Erin designs a trophy stand using one-inch cubes. The stand is shaped like a rectangular prism. How many different stands can Erin design using exactly 12 one-inch cubes? A) 8 B) 3 C) 5 D) 2 My work is 4*3*1, 12*1*1, 6*2*1, 2*2*3 Erin can make 4 different stands. Could someone...

Science
how many times does the sun appear to rise in a week? A) one B) Five C) seven D) not there I think it's c) seven. Plz check. Thank you!

Math
Lindsay draws a right triangle and adds the measure of the right angle and one acute angle. Which is a possible sum of the two angles? A) 180 B) 45 C) 90 D) 120 Answer is D) 120. Please correct me if I am wrong. Thank you for your help.

math NEED HELP!
Let x be the starting temperature. y=1.25x z=y-.4y=1.25x-.4(1.25x)=.75x So the final temperature is 75% of the original temperature.

Physics
A+B=4i+4j-k. Find the magnitude of A+B: mag(A+B)=sqrt(16+16+1)=sqrt(33). So the unit vector of A+B is (1/sqrt(33))*(4i+4j-k). A-B=2i-2j+9k. mag(A-B)=sqrt(4+4+81)=sqrt(89).The unit vector of A-B is (1/sqrt(89))*(2i-2j+9k)

Math
(5*2)(3*15) Thanks

Math
I need help to convert this expression in word problem not solution. Please help. Thanks! (5x2)x(3x15)

Math
Second problem I know how to solve but I have to convert this expression to word problem.

Math
I have done this problem converting numerical expression to word problem . Like (12x2)+(4x3) At arcade Jeff got 12 plushy for 2 coins each and 4 hand clapper for 3 coins each. Question asked how many coins he paid to buy all these toys? Answer is - 36 Now I am stuck with this ...

Math
I have to write a word problem with this expression. (3x2)x(3x15) Please help. Thank you!

Math
A chef makes 4 different quiches as the special of the day. At the end of the day, each dish had 3/8 of the quiche left. How much quiche was bought in all? Could someone please explain how to solve this problem?

Geometry
How to post a geometry question with picture?

Math
ohhh okay thank you.

Math
No no. I meant why did you multiply 2/3, 36/1, and 3/4?

Math
I get what you did, but can you please explain it to me? Sorry for the inconvenience.

Math
A certain grometry class has 36 students. if two-thirds are boys and three-fourths of the boys are under six feet tall, how many boys in the class are under 6 feet tall?

math
Thank YOU!!!

Geometry
Quadrilateral ABCD is a parallelogram. If adjacent angles are congruent, which statement must be true? A. Quadrilateral ABCD is a square. B. Quadrilateral ABCD is a rhombus. C. Quadrilateral ABCD is a rectangle. D. Quadrilateral ABCD is an isosceles trapezoid. My first pick is...

Economics
If an industry is highly profitable, new firms are likely to enter the market. This would be reflected with a shift of the A- demand curve to the right B-supply curve to the right C-supply curve to the left D- demand curve to the left

Math
Thank you!

Math
An ostrich at the zoo weighs 3 times as much as Marks's pet dog. Together, the ostrich and the dogweigh 448 pounds.how much does the ostrich weigh? Please help.

English
On this day, May 12, 2017, the album of the century was released: Harry Styles by Harry Styles Tracklist: 1. Meet Me In The Hallway 2. Sign of the Times 3. Carolina 4.Two Ghost 5. Sweet Creature 6.Only Angel 7. Kiwi 8.Ever Since New York 9. Woman 10.From the Dining Table You ...

Physics
A motorboat is headed [W35ºN] with its engine set to move the boat at 25 km/h in still water. The current is flowing at 18 km/h [S]. What is the velocity of the boat relative to the shore? My work: cos(35º)=x/25 25cos35=x x=20km/h I have an issue with finding the ...

Math
This is going to seem like a silly question, but I have to round points that fall on a graph to the nearest 1.25. Some of the points are 4.75, 4.5, 4.25, etc. - what would these round to? I just want to make sure I'm doing this right!

Statistics
What is the probability that the average lifetime of 25 bulbs would be no more than 1550 given mean of 1500 and standard deviation of 200 hours. I know that it is asking P(x less than or equal to 1550), x is 25, u equal 1500 and sd is 200. I'm having problems getting to ...

Statistics
What is the probability that the average lifetime of 25 bulbs would be no more than 1550 given mean of 1500 and standard deviation of 200 hours. I know that it is asking P(x less than or equal to 1550), x is 25, u equal 1500 and sd is 200. I'm having problems getting to ...

Statistics
Please help me understand this is asking and how to solve. P(-2>Z and Z<-1)= and X~N(3,4). Find value c such that P(c<x)=.7 Thank You!

Texas State History
What is the purpose of the NAFTA treaty?

Physics
A pilot checks her instruments and finds that her airspeed is 345 km/h and that she is heading in a direction [S40ºW].  A radio report tells her that the wind velocity is 85 km/h [NW].  What is the velocity of her plane relative to the ground? I tried to draw ...

history
The 60's were a tumultuous decade: which event(s). legislation, etc. do you feel has impacted or changed history the most? thank you

Chemistry
When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) à\longrightarrow ZnCl2(aq) + H2(g)

Math
1 pt) Consider the function f(x), for which f(0)=4 and f?(0)=?6. Find h?(0) for the function h(x)=1/f(x). h?(0) =

Math
One hour after x milligrams of a drug are given to a person, the change in body temperature T(x) (in degrees fahrenheit) is given by the function T(x)=x^2(1−x/3). Further, the rate T′(x) at which T changes with respect to the size of the ...

Math
f(x)=x^9h(x) h(−1)=5 h′(−1)=8 Calculate f′(−1).

Math
Suppose that f(x)=6x^−4+9x^−2. Evaluate each of the following: f'(3)= f'(-1)

Math
For what values of x is the tangent line of the graph of f(x)=2x^3?12x^2+19x+0 parallel to the line y=1x+0.7 ? Enter the x values in order, smallest first, to 4 places of accuracy:

Calcalus
A population P is a function of time t that had 5000 when t=0 can be written P(t)= 5000+B(t)-D(t). B(t) is the number of births since t=0 and D(t0 is the number of deaths since t=0. suppose at a given instant B=800 and dB/dt=100, and D=1000 and dD/dt=85. What is P? What is dP/dt?

history
i was needing help on picking the answer out of those 5

history
For a registered political party in a statewide election to gain ballot access, it must do the following except.. - obtain 5 percent of the vote in any statewide election. - voters cannot sign multiple petitions. - collect petition signatures equal to 1 percent of the total ...

Chemistry
How many grams of K2SO3 would be required to react completely with 200.0 mL of 0.245 M HCl

organic chemistry
The constants for Antoine’s equation for TCE (based on log10 and o C) are: A= 6.5183, B = 1018.6 and C = 192.7. If a container (negligible volume) is placed in a sealed room 1000 m3 at 30 oC, how many grams of TCE will evaporate upon reaching equilibrium with the liquid ...

Math - Algebra 1
A field must be fenced in. There is 212 yards of fencing material to be used. What should the dimensions of the enclosed area be to ensure that is has the largest area possible? (system of equations) Dimensions_____________________

Math - Algebra 1
Each cow eats 4.5 cups of feed a day and the bucket it comes in contains 250 cups. The buckets cost $26.75 each. If a farm has 16 cows, how much will it cost to feed all of the cows for 1 week? (system of equations) Cost____________________

Math - Algebra 1
A field must be fenced in. There is 212 yards of fencing material to be used. What should the dimensions of the enclosed area be to ensure that is has the largest area possible? Dimensions_____________________

calculus
use implicit differentiation to show: d/dx(tan^-1x)=1/(x^2+1)

Stats -Math
1. We are interested in conducting a study in order to determine what percentage of voters of a state would vote for the incumbent governor. What is the minimum size sample needed to estimate the population proportion with a margin of error of 0.05 or less at 95% confidence? ...

math
Yes, the slope of both lines is 0.5, which means the lines really are parallel. They never intersect, so there is no point that lies on both lines, and no solution to the system.

Physics
A tennis ball is served from the back line of the court such that it leaves the racket 2.4 m above the ground in a horizontal direction at a speed of 22.3 m/s. (a) will the ball cross a 0.91-m-high net in front of the server? Will the ball land in the service court, which is ...

texas history
i need help on figuring out a topic "The topic of your report must be an issue that is being addressed by both the state and federal government"

Physics
Thank you so much!

Physics
N be going up on the knife edge with the 0.200 kg mass.

Physics
Would the magnitude of N also be 3.72 N?

Physics
A meter stick whose mass is 0.200 kg is supported at the zero cm mark by a knife edge and a force F at the 100 cm point. A mass of 700 grams is attached to the stick at 40 cm mark. Find the magnitude of N and F in Newton's.

Math/algebra
Thank you for helping me Ms.Sue^.^ ?^?

Math/algebra
Sandy drives the first 3 hours of her trip at 65 miles per hour. The last hour of the trip she drives 62 miles per hour. How far did Sandy drive on her trip?

science
What is the volume of chlorine that is used to produce 292 grams of hydrogen chloride?

maths
Calculate the lengths of the straight lines joining the following pairs of points, leaving your answers in surd form: (a) A(4,-3), B(7,6).

maths
The points A(1,5) and B(9,3) are part of a triangle ΔABC. The triangle has a right angle at A and and sides satisfy AB=2AC. Find a point C such that C lies above the line AB.

maths
Consider the 4 points A(1,5), B(-4,6), C(0,0), D(-12,12). Find the gradients of the lines: (a) AB; (b) CD; (c) BD.

Maths
By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

Maths
By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

Maths
By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

Maths
By making the substitution u=7^x and using part a, derive a hidden quadratic equation 7^(2x-1) +4×7^(x-1) -1/14 =0 and hence find all of the solutions to the above equation.

maths
By making the substitution u =ln x show that the following equation has exactly one real-number solution: -12/ln x +ln x^4 = -9

maths
By making the substitution u=7^x and using part a, derive a hidden quadratic equation 7^(2x-1) +4×7^(x-1) -1/14 =0 and hence find all of the solutions to the above equation.

Maths
Let u=7^x. Using the rules for powers show that i) 7^x-1 = u÷7 and ii) 7^2x-1 = u^2÷7

Algebra 1
So how do I write it in step by step form, for an essay?

Algebra 1
Is that the answer? 2 x (2 x^2 + x + 1)? Or do I need to factor it, like it says?

Algebra 1
f (x) = 9x^3 + 2x^2 - 5x + 4 and g(x) = 5x^3 - 7x + 4. What is f (x) - g(x)? Show all your stes and write your final answer in factored form. I am really stumped on this, could someone help me?

chemistry
Why do some reactions go to completion while others reach a state of equilibrium?

Chemistry
Determine the mass of urea, CH2N2O, required to make 250mL of a 0.235 M solution

Math
1) A television tower is 160 feet high and an observer is 120 feet from the base of the tower. Find, to the nearest degree, the angle of elevation of the top of the tower from the point of observation. 2) A vertical pole 22 meters tall casts a shadow 16 meters long on level ...

connections Academy sucks
I have depression and anxiety and its much too hard. Im 40 lessons behind. I do the basic stuff on each lesson but it still takes me like 2 hours each lesson.

Chemistry
3. What experimental problems would confront you if you attempted to determine the concentration of the metal ions in solutions of each of the following reagents? a. Cr +3 which has a maximum absorbance at 407 nm with absorbtivity of 15 M -1 cm -1 and another at 574 nm with ...

Organic Chemistry
Compound A has solubility at 20 degrees celsius of .029 g / 10.0 mL. How much of compound A will remain in solution after cooling to 20 degrees C?

Chemistry
Given a 800 mg sample of Thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg? 231 0 231 Th -> Beta + Pa 90 -1 91 800 mg/ 25 mg

precalc
A Norman window has the shape of a square with a semicircle mounted on it. Find the width of the window if the total area of the square and the semicircle is to be 240 ft squared

Physics
A baseball is his so that a travel straight upward after being struck by the bat. A fat observes that it takes three seconds for the ball to reach its maximum height. Find the balls initial velocity and the height it reaches. my professor showed a similar problem to this but ...

Art
It is interperet

Art Study
It's interpret

Homework Help: Art
It is interperet

math
John can cut the grass in 4 hours working by himself. When john cuts the grass with his younger brother michael, it takes 3 hours. How long would it take michael to cut the grass by himself?

math
I think so , i was pretty distressed regarding this matter,thank you for helping me.

math
i took algebra 2,but i don't know why my teacher didn't bother to teach me this topic

math
Are trigonometric functions taught in 11th grade, if so ,is it wrong that i wasn't tought that topic in 11th grade????plz help!!!!

Maths
Steve - you answered this question earlier for someone else and gave them the formula for how to answer it. I have the same problem in my homework and have used the formula you gave, but have got an answer that does not appear in the answer options. I got 12.75 Would you be ...

Maths
Steve - you answered this question earlier for someone else and gave them the formula for how to answer it. I have the same problem in my homework and have used the formula you gave, but have got an answer that does not appear in the answer options. I got 12.75 Would you be ...

Science
sodium can be extracted by heating naturally occuring salt until it is molten. an electrochemical process is then used to extract the sodium. cl2 is produces at the anode and Na is collected at the cathode. write the half-reactions that occur at the anode and the cathode. ...

Maths
*u not i

Maths
In3/In1.09=12.75 should I choose answer 12.2?

english
how do put an author of a research article and where they are from in apa format example author: Daniel S. Budnitz, M.D., M.P.H.

math
thanks!!!!

math
when dealing with sigma notation, if i enclose my formula with parenthesis,does it make it different from a formula with no parenthesis? plz help, I saw this in regents prep webpage and I just didn't see any difference, but they say that the parenthesis changes the result.

history
Andrew Jackson in 1828 & 1832: a) what policies or actions were not good b) what policies or actions were good

English
I was assigned to write an essay,after writing it ,I started to question my writing, and I just cannot decide on whether I should use passive or active voice for this kind of formal writing. ..yes,I have researched, but can't establish which one is more adequate.

Chemistry
the question says: Calculate the mass of soap (NaC17H35COO) which contains 1.25 grams of Carbon. Do I use the percentage composition of soap and the mole?

history
compare & contrast the accomplishments, shortcomings of the first four presidents: Washington, Adams, Jefferson, Madison thank you

Math
A cone-shaped pile of sawdust has a base diameter of 40 feet, and is 15 feet tall. Find the volume of the sawdust pile. Round your answer to the nearest hundredth if necessary. Use 3.14

math
Tory and Emilio's motorboats travel at the same speed. Tory pilots her boat 40 km before docking. Emilio continues for another 4 hr, traveling a total of 90 km before docking. How long did it take Tory to navigate the 40 km?

Math
An suv drove 54 miles using 3 gallons of gas at this rate how far could it drive with 5 gallons of gas?

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