Wednesday

January 18, 2017
Total # Posts: 1,096

**math**

Determine all values of k for which each pair of vectors is orthogonal. a) (1,2) and (k,k) b) (1,2,1) and (k,2k,4)

*September 23, 2014*

**Algebra**

Logan saves $5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves.

*September 23, 2014*

**Math**

Find a unit vector in the direction of(1/2, 1/2, 1/2).

*September 23, 2014*

**Algebra**

x^3 + 6x^2 + 10x = 0

*September 19, 2014*

**Math**

The speed of the current in a stream is 4 mi/hr. It takes a canoeist 96 minutes longer to paddle 13 miles upstream than to paddle the same distance downstream. What is the canoeist's rate in still water?

*September 15, 2014*

**math**

given the domain of g(x) is (-3,5) and the range of g(x) (-10, 10) find the domain and range of the transformed function 4g(x-7)+12

*September 14, 2014*

**Math**

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides (see the figure). If the area of the base is to be 144 in^2, what size piece of cardboard should ...

*September 14, 2014*

**Physics**

While entering a freeway, a car accelerates from rest at a rate of 2.3 m/s2 for 12 s.How far does the car travel in those 12 s, in meters?

*September 14, 2014*

**math**

You are running a fuel economy study. one of the cars you find is blue. it can travel 35 1/2 miles on 1 1/4 of gasoline. Another car is red. It can travel 27 1/5 on 4/5 gallon of gasoline. What is the unit rate for miles per gallon for the blue car? what is for the red?

*September 10, 2014*

**Math**

(2x^3y^2z)-2/(3x^4yz^-2)^-2

*September 10, 2014*

**math**

A rectangular box is to have a square base and a volume of 30 ft3. The material for the base costs 33¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top costs 24¢/ft2. Letting x denote the length of one side of the base, find a function...

*September 7, 2014*

**Math**

Simplify each expression. Write your answer using a postive exponent. 1.2^0 divided by 1.8 ^2

*September 2, 2014*

**english**

Just did this 1C 2A,D 3B 4B,D 5B,D 6C

*August 15, 2014*

**Math**

Which inequality is correct? A. ^11 <^22 < 11 B. 11 < ^11 < ^22 C. ^11 < 11 < ^22 D. ^22 < ^11 < 11 My answer is c is that correct

*August 14, 2014*

**geometry**

What is the distance between (-4,3)and (5,-2)

*July 16, 2014*

**geometry**

which set of ordered pairs has point symmetry with respect to the origin (0,0) 1- (-12,5), (-5,12) 2- (-12,5), (12,-5) 3- (-12,5), (-12,-5) 4- (-12,5), (12,5)

*July 16, 2014*

**math**

Which of the following is a negation of the statement below? All cats are not mammals. All mammals are not cats. All cats are mammals. Some cats are mammals. All mammals are cats.

*July 16, 2014*

**math**

theres two that are right I got the one just not the other can you please help

*July 16, 2014*

**math**

Which statements about a rhombus are always true? Its diagonals are congruent. All angles are congruent. All sides are congruent. Its diagonals are Û to each other.

*July 16, 2014*

**math**

so never

*July 16, 2014*

**math**

always

*July 16, 2014*

**math**

Determine if the statement is always, sometimes, or never true: A right triangle is an obtuse triangle. always sometimes never

*July 16, 2014*

**math**

The altitude of an equilateral triangle is 6 square 3 units long. The length of one side of the triangle is ____ units.

*July 14, 2014*

**math**

Find the coordinates of the midpoint of the segment whose endpoints are given. W (-3, -7) and X (-8, -4)

*July 14, 2014*

**math**

If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its center point is

*July 10, 2014*

**math**

If the point (a,3) lies on the graph of the equation 5x + y = 8, then a=

*July 10, 2014*

**math**

If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its radius is

*July 10, 2014*

**math**

Find the surface area of an orange with a 3'' radius.

*July 9, 2014*

**math**

The radius of one sphere is twice as great as the radius of a second sphere. Find the ratio of their surface areas.

*July 9, 2014*

**math**

Find the slant height for a right circular cone with a radius of 3 and a height of 5.

*July 9, 2014*

**marh**

The radii of two circles are in the ratio of 3 to 1. Find the area of the smaller circle if the area of the larger circle is 27 sq. in.

*July 8, 2014*

**General Physics 1**

1) A car moving with an initial velocity of 29.6 m/s decreases to a velocity of 17.9 m/s over a time interval of 4.08 seconds. (a.) What is the average acceleration of the car during this time? (b.) Assuming the acceleration is constant, how far did the car travel during this ...

*June 16, 2014*

**math HELP!!!!!!**

only 8 are right ur wrong don't trust him

*June 2, 2014*

**Hileyville Hight**

37.8 divided by 10 3

*May 23, 2014*

**English 30**

How does the short story "Happy Event" by Nadine Gordimer relate to the impact of an individual's ambition on self and others?

*April 23, 2014*

**chemistry**

what type of reaction occurs Fe3O4 + 4H2 → 3Fe + 4H2O

*April 18, 2014*

**Science**

Earth pulls downward due to gravitational force. electric current in coils produce electromagnets which repel the superconducting dimagnetic material with equal force upwards.

*April 10, 2014*

**Science**

Earth pulls downward due to gravitational force. electric current in coils produce electromagnets which repel the superconducting dimagnetic material with equal force upwards.

*April 10, 2014*

**physics**

Mary is standing at a place such that she makes an angle of 42° to the right of the normal of a mirror. Where should Mary's mom stand so that she can best see Mary's reflection in the mirror?

*April 9, 2014*

**new social studies**

B A D A

*April 7, 2014*

**social studies(updated answers)--**

BTW the answers are 1. c 2. a 3. a 4. c 5. d

*April 5, 2014*

**Maths**

There will be four exams this semester. You've already taken the first three. Your scores were 60, 82, and 93. What score must you get on your fourth test in Oder to earn at least an 80% in the class

*April 3, 2014*

**social studies check answers**

1 b 2 d 3 a 4 a 5 a 6 b 7 d 8 a 9 b 10 a

*March 25, 2014*

**social studies**

1. A 2. C 3. A 4. A 5. C 6. B 7. D 8. C 9. B 10. D

*March 17, 2014*

**Math 2**

9 because there is 9 factors of 360 that are also factors of 10 😃😊 hope that helped.

*March 10, 2014*

**help**

I recently had an essay on illegal immigrants in the United States and I wrote in there about Mexican workers in the US sending money to Mexico and I got a 100 so I believe A is right.

*March 4, 2014*

**Math**

When the sum of all the positive even numbers is 420, find the largest even number in the sequence.

*February 25, 2014*

**SCIENCE HELP ASAP! :)**

Wow 100% thanks

*February 19, 2014*

**math**

James measures the length of a mask that he made an art class. it measures 6 3/4 inches between which two inch marks on the ruler is measurement

*February 10, 2014*

**physics**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.3 m/s and ax = +2.6 m/s2. The y components of the puck's initial velocity and acceleration are ...

*February 10, 2014*

**physics**

The Space Shuttle travels at a speed of about 5.05 x 103 m/s. The blink of an astronaut's eye lasts about 94.4 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?

*February 3, 2014*

**phsyics**

A jogger accelerates from rest to 3.65 m/s in 3.46 s. A car accelerates from 24.0 to 40.1 m/s also in 3.46 s. (a) Find the magnitude of the acceleration of the jogger. (b) Determine the magnitude of the acceleration of the car. (c) How much further does the car travel than the...

*February 3, 2014*

**Social Studies**

In what way were Bernardo de Galvez's adventures like those of another war hero?

*January 21, 2014*

**chemistry**

How many moles of protons are present in 7.54 grams of Rubidium? Report your answer to 3 significant figures.

*January 17, 2014*

**Math**

I don't get this too, can you help me too? Im a fifth grader too so I cant do Algebra.

*January 16, 2014*

**math**

Melissa has 10 coins in her pocket. 2 quarters 3 dimes 4 nickel 1 penny What is the theoretical probability of pulling a quarter out of your pocket, putting it back, then pulling out a penn? My answer is 1/50 Also what is the theoretical probability of pulling a nickel out of ...

*January 9, 2014*

**SS**

thanks

*December 30, 2013*

**home inspection**

Based on standards of practice guidelines, which of the following home components is normally required to be inspected? A. Awnings C. Storm window B. Storm door D. Balconies

*December 4, 2013*

**brief calc**

p = 8 − 2q1/3; p = 6 same as before calculate surplus

*December 4, 2013*

**brief calc**

q = 130 − 2p; p = 11 calculate consumers surplus at p im getting 9930, but it is wrong.

*December 4, 2013*

**Gen Chem II**

This is in a nuclear radiation lab. (gamma rays from Cs 137 passing through lead. initial radiation (with one plate) 500cpm final radiation intensity with 2 plates 300cpm thickness of 1 absorbing plate in centimeters 0.635 I need to figure out the penetration factor and i need...

*December 3, 2013*

**calc**

Calculate the 5-unit moving average of the function f(x) = x^2/3

*November 26, 2013*

**brief calc**

evaluate the integral using integration by parts 7xe^-x

*November 19, 2013*

**brief calculus**

x/(x − 6)^2 I get ln(x-6)- 6/(x-6)+ C but it isn't correct, what should the answer be?

*November 18, 2013*

**Chemistry**

seriously, any help would be much appreciated. You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery...

*November 18, 2013*

**Gen Chem II**

You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume that the entire battery charge is useable for electroplating. You get ...

*November 18, 2013*

**brief calc**

Calculate the total area of the region described. Do not count area beneath the x-axis as negative. Bounded by the curve y = square root of x the x-axis, and the lines x = 0 and x = 16 This is under Integrals, i don't know what i'm doing wrong, please help

*November 6, 2013*

**Brief calculus**

The marginal cost of producing the xth box of CDs is given by 9 − x/(x^2 + 1)^2. The total cost to produce 2 boxes is $1,200. Find the total cost function C(x). I'm getting 9x-(1/(x^2 - 1))+1181.9 but i guess its wrong

*November 3, 2013*

**Algebra**

how would you solve these two equations. ln x + ln(x+1)=1 ln(x+5) = ln(x-1) - ln(x+1)

*October 30, 2013*

**Gen Chem 2**

How many equivalence points would be visible for a solution of 1.0M sulfurous acid titration. Is it just two because in H2SO3 there are two H+ ions?

*October 29, 2013*

**brief calculus**

I have everything right but the last question asking how many cases per week The consumer demand equation for tissues is given by q = (97 − p)^2, where p is the price per case of tissues and q is the demand in weekly sales. (a) Determine the price elasticity of demand E ...

*October 29, 2013*

**calc**

I have everything right but the last question asking how many cases per week The consumer demand equation for tissues is given by q = (97 − p)2, where p is the price per case of tissues and q is the demand in weekly sales. (a) Determine the price elasticity of demand E ...

*October 28, 2013*

**brief calculus**

I found that c=1 but i can't get the other two questions The velocity of a particle moving in a straight line is given by v(t) = t2 + 7. (a) Find an expression for the position s after a time t . s(t) = _____ + C (b) Given that s = 1 at time t = 0, find the constant of ...

*October 28, 2013*

**math**

-2/3x>8

*October 28, 2013*

**brief calculus**

Find f(x) if f(1) = 1 and the tangent line at (x, f(x)) has slope 6/x

*October 27, 2013*

**Chemistry**

Oh, ok well i came out with a pH of 5.22. pH = pKa + log A/HA. I came up with .15M as A and .05 as HA. So 4.74+log(3)= 5.22.

*October 22, 2013*

**Chemistry**

what is the resultig pH if 0.005 mol of NaOH is added to 100.0mL of buffer containing 0.010 mol acetic acid (CH3COOH,pKa = 4.74)and 0.010 mol sodium acetate (NaCH3COO)? (Assume the final volume is 100 mL) So i worked it out, i just need to double check the pH. Let me know what...

*October 22, 2013*

**Chemistry**

What determines the greatest buffer capacity when looking at solutions? The professor said he would have a list of solutions on the test and we choose the one with the best buffer capacity

*October 17, 2013*

**Gen Chm 2**

What determines the greatest buffer capacity when looking at solutions? The professor said he would have a list of solutions on the test and we choose the one with the best buffer capacity.

*October 17, 2013*

**Science**

What part of the circulatory system moves the blood through your body?

*October 16, 2013*

**Math**

1. Multiplying to make 50. Ways to multiply with to factors. Ways to multiply with more than two factors. 2. Multiplying to make 72. Ways to multiply with two factors: Ways to multiply with more than two factors:

*October 15, 2013*

**Chm 2**

The question asks, Consider the following weak acids and their Ka values Acetic acid Ka = 1.8x10^-5 Phosphoric acid Ka = 7.5x10^-3 Hypochlorous acid Ka = 3.5x10^-8 What weak acid-conjugate base buffer system from the acids listed is the best chouce to prepare the following ...

*October 15, 2013*

**chm 2**

On the same type of problem as the previous one, it is now asking the pH of 1ml of NaOH plus 50ml water. If i solve for pOH taking .001ml / .051, i get the same number as before, can i just subtract the number from 14 to get pH of the basic solution? 12.29 was what i came up ...

*October 14, 2013*

**Chem 2**

So i need to calculate the pH of 50ml water (de-ionized) with 1 ml of 1M HCl. So the moles of HCl i think is .001 divided by the total amount of solution (.051). I get 0.0196, then i take the negative log of this number and it comes out to 1.71 roughly. Does this sound right? ...

*October 14, 2013*

**Brief Calculus**

if s''(t)=((-)1/4t^3/2) +8 Then what is s''(16)?

*October 11, 2013*

**Brief Calculus**

The position s of a point (in feet) is given as a function of time t (in seconds). s = −10 + t − 15t2; t = 8 (a) Find the point's acceleration as a function of t. s''(t)= I know this answer, it is -30 (b) Find the point's acceleration at the ...

*October 10, 2013*

**Math**

Explain how you know whether an estimate of a product is an overestimate or an underestimate?

*October 10, 2013*

**pure maths, life science, physical science, geogra**

what can you study with those subjects

*October 10, 2013*

**General genetics**

I'm trying to find out how we know that bacteria involves contact before the transfer of DNA during conjugation. In the book, all they say is that DNA is not transferred along the f pilus as previously thought, but it is contacted first, then a channel opens up for the ...

*October 9, 2013*

**Brief Calculus**

Nevermind i figured it out. 30.1 years to maximize value

*October 8, 2013*

**Brief Calculus**

Last one for today... As the financial consultant to a classic auto dealership, you estimate that the total value (in dollars) of its collection of 1959 Chevrolets and Fords is given by the formula v = 303,000 + 1,020t2 (t ¡Ý 5) where t is the number of years from...

*October 8, 2013*

**Brief Calculus**

Minimize F = x2 + y2 with x + 2y = 5 Thank you

*October 8, 2013*

**physics**

yes to solve its the distance traveled/ 40(this is velocity) for acceleration its the velocity/5 so v=d/40 a=v/5

*October 5, 2013*

**physics (it's rather urgent help is appreciated**

@Anonymous how do you solve for the 7th question

*October 5, 2013*

**physics (it's rather urgent help is appreciated**

@ss01 if you check homework 2 the 2nd last question it shows you how to do question 2. for quetion 3 Ac must be 10m/s so you get 10=v^2/r and from there you can solve since i don't know what value of r you got

*October 5, 2013*

**physics (it's rather urgent help is appreciated**

which part?

*October 5, 2013*

**physics (it's rather urgent help is appreciated**

i got all except this one

*October 5, 2013*

**physics (it's rather urgent help is appreciated**

ss01 how do you solve this then

*October 5, 2013*