Monday

April 27, 2015

April 27, 2015

Total # Posts: 757

**Analytic Geometry**

The line through the points (-1, 6) and (5, -2)intersects the line through (4, -4) and (1,7).Determine the angle between these two intersecting lines.
*April 26, 2015*

**ccmess**

I was so sad that they told me no worksheets
*April 25, 2015*

**Analytic Geometry**

The line segment joining a vertex of a triangle and the midpoint of the opposite side is called the median of the triangle. Given a triangle whose vertices are A(4,-4), B(10, 4) and C(2, 6), find the point on each median that is two-thirds of the distance from the vertex to ...
*April 23, 2015*

**7th grade math**

Oh.thank you!
*April 23, 2015*

**7th grade math**

Can you check the following problem? (forgot to incl last night) 1. Which is an equivalent equation to (2/3)x - 1 = 1/2 that does not contain fractions? (2/3)x = 1 + 1/2 (2/3)x = 3/2 x = 3/2 * 3/2 x = 9/4 x = 2 1/4 A. 4x - 6 = 3 4x = 9 x = 9/4 x = 2 1/4 B. 4x - 2 = 3 4x = 5 x...
*April 23, 2015*

**Analytic Geometry**

What are the lengths of the segments into which the y-axis divides the segment joining (-6,-6) and (3,6) ?
*April 23, 2015*

**7th grade math**

THank you.
*April 22, 2015*

**7th grade math**

Can you check the folowing problems. 1. 8(10) + 8(4) = 8(14) is an example of which property? A. Distributive property B. Associative property C. Identiy property D. Commutative property Ans:A 2. By Saturday night, 3 inches of rain had fallen in Happy Valley. The weekend ...
*April 22, 2015*

**Analytic Geometry**

Show that the points A(-2, 6), B(5, 3), C(-1, -11) and D(-8, -8) are the vertices of a rectangle.
*April 22, 2015*

**Analytic Geometry**

The ordinate of a point P is twice the abscissa. This point is equidistant from (-3, 1) and (8,-2). Find the coordinates of P.
*April 22, 2015*

**physics**

A 4.00 kg ball traveling North with a momentum of 11.2 kg.m/s collides with a 6.0 kg ball traveling West with a momentum of 18 kg.m/s. The two balls stick together and head off as one. What is the momentum of the combined masses? What is the velocity of the combined masses?
*April 19, 2015*

**AP Physics**

The white ball in the figure has a speed of 1.67 m/s and the yellow ball is at rest prior to an elastic glancing collision. After the collision the white ball has a speed of 1.43 m/s. To the nearest tenth of a degree, measured counterclockwise from east, what angle does it ...
*April 18, 2015*

**Chemistry**

Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and maybe d
*April 18, 2015*

**AP Physics**

The white ball in the figure has a speed of 1.67 m/s and the yellow ball is at rest prior to an elastic glancing collision. After the collision the white ball has a speed of 1.43 m/s. To the nearest tenth of a degree, measured counterclockwise from east, what angle does it ...
*April 18, 2015*

**physics**

Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? A) .01 B) .20 C) .38 D) .48
*April 7, 2015*

**7th grade math**

Can you check the following? 1. (-1/3)x = -5 multiply both sides by -3 because dividing by fraction is same as multiplying by its reciprocal, right? Ans: -5(-3)= 15 2. x - (-3) = -8 + (-3) + (-3) x = -11 3. The signup fee to join Flexible Fitness Gym is $25. The monthly fee is...
*April 1, 2015*

**7th grade math (probability)- additional questions**

Thanks
*March 31, 2015*

**7th grade math (probability)- additional questions**

Thanks. Can you check the one from yesterday as well?
*March 31, 2015*

**7th grade math (probability)- additional questions**

Here are additional problems that weren't included in original post from 3/30. 4. There are 5 different color jolly ranchers in a bag - 10 cherry, 15 watermelon, 12 grape, 10 apple, and 8 raspberry. What is probability that you'll choose raspberry? Ans: 8/55 =.1454 = ...
*March 31, 2015*

**7th grade math (probability)**

I'm not sure how to answer this: 3. THe 7th grade wants to have a back-up representative just in case the first teacher is absent. Based on the same scenario as #2, if a math teacher was chosen to be the 7th grade representative, what is the probablility that the back-up ...
*March 30, 2015*

**7th grade math (probability)**

Thanks!
*March 26, 2015*

**7th grade math (probability)**

Can you check these, please? Ten cards numbered 1 through 10 are mixed together and then one card is drawn. Find the probability of each event. Write each answer as a fraction, percent, and decimal. 14. P(less than 5) = 4/10 = 2/5 Ans: 2/5, 40%, 0.4 15. P(greater than 3) = 7/...
*March 26, 2015*

**7th grade math**

Can you check these? 1. Jonelle is running on a track that is 2/3 of a mile long. So far she has run 4/5 of the way around the whole trace. How far has she run so far? Ans: (2/3)(4/5) =8/15 mile 2. A recipe for muffins needs 3/4 of a cup of milk. You are making 1/2 of the ...
*March 25, 2015*

**math**

Alice is 5 feet and has shadow of 4 feet long. how tall is the tree?
*March 24, 2015*

**7th grade math**

1. Evan withdrew a total of $160 from an ATM machine over a 4-day period. He withdrew the same amount of money each day. a. Write an expression to represent the total amount that Evan's account changed each day. Ans: 4d b. What integer represents the total amount that Evan...
*March 24, 2015*

**Math - 7th grade (repost)**

Can someone please help? I'm given a box and whisker plot that represents the cost, in dollars, of 12 CDs. How can I determine how many CD's cost between $14.60 (Q1 value) and $26 (Q3 value) and how many CD's cost less than $14.60?
*March 18, 2015*

**Math - 7th grade**

I'm given a box and whisker plot that represents the cost, in dollars, of 12 CDs. How can I determine how many CD's cost between $14.60 (Q1 value) and $26 (Q3 value) and how many CD's cost less than $14.60?
*March 17, 2015*

**math**

Find the fifth term of a geometric sequence whose fourth term is 8/9 and whose seventh term is 64/243.
*March 16, 2015*

**math**

The concentration (in milligrams per liter) of an antibiotic in the blood is given by the geometric series A + Aekt + Ae2kt + + Ae(n − 1)kt where A is the number of milligrams in one dose of the antibiotic, n is the number of doses, t is the time between doses, and k is ...
*March 15, 2015*

**Science - 7th grade (repost)**

Can you check my homework? 38. How does natural selection lead to evolution? a. Organisms mutate to adapt to their environment. b. Helpful traits accumulate among surviving members of the species. c. Overproduction provides food for stronger members of the species. d. ...
*March 12, 2015*

**Science - 7th grade**

Can you check my homework? (don't think I'd posted before) 38. How does natural selection lead to evolution? a. Organisms mutate to adapt to their environment. b. Helpful traits accumulate among surviving members of the species. c. Overproduction provides food for ...
*March 12, 2015*

**Science - 7th grade**

Can you check the following? Experiment A: Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After three weeks on the diet, the rats’ masses are measured again to see if ...
*March 11, 2015*

**Math - 7th grade**

thanks!
*March 11, 2015*

**Math - 7th grade**

Can you check following? 1. The football association wants to increase the number of students who attend the football games for the upcoming season. In order to accomplish this, the association is surveying students to gain more information about student interest in sports. ...
*March 11, 2015*

**chemistry**

the vapor pressure of carbon sulfide is 355.6 torr at 25 degrees Celsius. what is the vapor pressure of a solution prepared by dissolving 12.52 g naphthalene (C10H8, 128.2 g/mol) in 125.0 mL CS2 liquid (76.14 g/mol, 1.261 g/mL)? Assume the solution obeys Raoult's law, and ...
*March 4, 2015*

**7th grade math**

Can you help with geometry? 1. Sally constructs a triangle with one side 6 inches long and another side 8 inches long. What is the 3rd side? (haven't learned Pythagorean theorem) Ans: 6 + x > 8 x > 2 6 + 8 > x 14 > x 8 + x > 6 x > -2 so, x must be > 2...
*February 27, 2015*

**math**

OQRS IS A QUADRILATERAL SUCH THAT OQ= -6,3 OR= -3,7 AND OS 1,5. T IS THE POINT ON OQ SUCH THAT OT:TQ= 2:2. PROVE QRST IS A PARALLELOGRAM
*February 25, 2015*

**chemistry**

You add 8.7g of iron to 21.30mL of water and observe that the volume of iron and water together is 22.41mL . Calculate the density of iron.
*February 22, 2015*

**physics**

An object travels at 5.00 m/s in the +x direction and 4.00 m/s in the +y direction. What is the magnitude of its velocity?
*February 17, 2015*

**physics**

An object has a velocity of 5.00 m/s at an angle of 30.0˚ north of east. If we define east as the +x direction and north as the +y direction, what is the magnitude of vy?
*February 17, 2015*

**physics**

A person walks 4.0 miles east and then makes a 50° turn to the right and walks another 2.0 miles. How far is she from her starting point?
*February 17, 2015*

**Science - 7th grade**

Can you check the following: 1. Draw a Punnett Square to show a dog breeder inbreeding to maintain a purebred line of golden retrievers. Ans: would the parental cross look like Gg x GG or GG x GG? 2. Draw a Punnett Square to show a farmer crossing a plant that produces a large...
*February 15, 2015*

**math**

I am a positive integer less that 30, two more than my value is a mulitple of 6 the sum of my digits is a mulitple of 7 find this number
*February 13, 2015*

**Physics**

A magnifier has a magnification of 6x. How far from the lens should an object be held so that its image is at the near point distance of 25 cm? I tried doing the problem by using the equation M = 25cm / f. M = 25 cm/6 = 4.17 cm However when I put the answer into mastering ...
*February 10, 2015*

**7th grade math**

thanks!
*February 2, 2015*

**7th grade math**

Can you check the following? 1. Alicia shoots basketball at a hoop 100 times. She hits the backboard and misses with 2/5 of her hots, hits the rim and misses with 32% of her shots and makes basket with rest of her shots. How many baskets did she make? A. 68 B. 40 C. 32 D. 28 ...
*February 2, 2015*

**physics**

An astronaut visits a moon of Saturn, and decides to measure the accel. of gravity. He ties a rock (m=2 kg) to a rope (1.25 m), pulls the rock back 10 degrees, and releases it into simple harmonic motion. What is the accel due to gravity on the moon? (*I have no idea where to ...
*February 1, 2015*

**physics**

The effective k of the diving board shown here is 1675 N/m. A heavy diver is bouncing up and down at the end of the diving board. With what frequency does he bounce up and down? How long does it take for him to complete one bounce (up and down)? What is the mass of the man? I ...
*February 1, 2015*

**7th grade science**

Can you help me with genetics questions? Directions: In each set, tell which word does not fit with the others. Then explain why you think it does not. You must mention all words. 1. Aa, Heterozygous, Hybrid, Homozygous Ans: Homozygous doesn't belong because letters are ...
*January 29, 2015*

**7th grade LA**

Ok, thanks!
*January 26, 2015*

**7th grade LA**

Choose the correct evaluation of each underlined word. (Larsen's underlined in this sentence) 6. The Larsen’s decided not to shutter their windows even though they were taking vacation at the height of hurricane season. A. Larsen’s contains a correct apostrophe. ...
*January 26, 2015*

**7th grade math**

Can you check these simple interest problems? 1. If you borrow $421 for nine years at an interest rate of 4%, how much interest will you pay? Ans: I = prt I = $421*.04*9 I = $151.56 2. If the balance at the end of 8 years on an investment of $630 that has been invested at a ...
*January 21, 2015*

**7th grade LA**

thanks!
*January 21, 2015*

**7th grade LA**

Are these correct now? Ans#4: Smiths' Ans#7: It's
*January 21, 2015*

**7th grade LA**

Can you check the following? Punctuate the following sentences with appropriate apostrophes. 1. Whos the partys candidate for vice president this year? Ans: Who's, party's 2. Our neighbors car is an old Chrylser, and its about to fall apart. Ans: neighbor's, it'...
*January 21, 2015*

**7th grade math**

ok, thanks for checking!
*January 17, 2015*

**7th grade math**

Can you check these please? 4. A local bakery sold 60 loaves of bread in one day. If 65% of these were sold in the afternoon, how many loaves were sold in the afternoon? Ans: x = .65 * 60 x = 39 loaves 7. Ruben bought 6new books for his collection. This increased his ...
*January 17, 2015*

**7th grade math**

thanks!
*January 16, 2015*

**7th grade math**

Can you check the following? 10. A store pays $10 for a bracelet, and the markup is 115%. A customer will also pay 5 1/2% sales tax. What will be the total cost of the bracelet to nearest cent? t = 1.15 x 10 t = $11.5 (markup price) t = $10 + 11.5 t = $21.50 (cost of bracelet ...
*January 16, 2015*

**math**

how many positive whole numbers smaller than 2003 have 2 as their first digit and 1 as their last digit
*January 16, 2015*

**mathematics**

he dimensions of a rectangular prism are (5x squared - 4x - 3) (x squared - x + 1) cm by (3x squared - 5) cm. Find a polynomial which represents 1. the total surface are of the prism. 2. the total length of the edges of the rectangular prism 3. the volume of the prism.
*January 14, 2015*

**Math**

Example of a real-world relationship where there is no clear independent or dependent variable.
*January 13, 2015*

**7th grade LA**

Thanks!
*January 13, 2015*

**7th grade LA**

Can you check the following? Add a comma if needed to words in () in following sentences. 1. She was a (beautiful gentle) woman. Ans: beautiful, gentle 2. "Come now", said Scully sharply to the (three seated) men, "move up and give us a chance at the stove."...
*January 13, 2015*

**Physics**

suppose you have a weight of 60 N. if the earth's mass decreased to one fourth its current mass, with no change in radius, then what would you weigh? Can you please explain how I can solve this problem?
*January 12, 2015*

**7th grade LA**

Thanks!
*January 9, 2015*

**7th grade LA**

Can you check these and let me if reason correct also? Choose the correct prounoun. 1. Each of the suspects had (his, their) own alibi. Ans: his (because each is singular) 2. Jeff and Isabel planned (his and her, their) wedding. Ans: their (because subject is plural) 3. Did ...
*January 9, 2015*

**7th grade LA**

Can you check the following? Identify the sentence type. 1. I like playing basketball, and my brother likes playing tennis. Ans: compound 2. I'll help you if you help me. Ans: complex 3. My mother cooked dinner while I was doing my homework. Ans: complex 4. Because she ...
*January 8, 2015*

**physics **

A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to gravity at the surface ...
*January 7, 2015*

**math**

On Monday, 247 students went on a trip to the zoo. All six buses were filled and seven students had to travel in cars.How many students were in the bus
*January 7, 2015*

**7th grade math**

Thanks!!
*December 17, 2014*

**7th grade math**

sorry, typo on #4 still. answer is just 112
*December 17, 2014*

**7th grade math**

For #4 should be: m/8 = 5 +9 m/8 = 14 m = 14*8 m = 112/8
*December 17, 2014*

**7th grade math**

Can you check these problems? 1. 4x^2 + 3x - 4x +5 = 4x^2 - x + 5 2. m - n + m - n - n = 2m - 3n 3. (7x + 5 - 3y) - (-3x - 5 +4y) = 7x + 3x -3y + 4y + 0 = 10x - y = 0 4. m/8 - 9 = 5 m/8 = 5 + 9 m = 14/8 m = 7/4 = 1 3/4
*December 17, 2014*

**7th grade math**

Can you check these? 3. Simplify (56/8+3)*2-1 = (7+3)*2-1 = 10*2-1 = 20-1 = 19 9. A spool of lanyard is 21 yards long. If it is cut into pieces that are each 1.75 yards long, how many pieces of lanyard will there be? Ans:21/1.75 = 12 pieces 12. (3/5)x - 10 = 1/6 Ans: (3/5)x = ...
*December 15, 2014*

**7th grade math**

thanks! hopefully, the others i posted are correct too.
*December 14, 2014*

**7th grade math**

Can you check these additional problems? 36. 10 - h >= 21 -h >= 21 - 10 -h >= 11 h >= -11 38.p + 8.5 > 1 p > 1 - 8.5 p > -7.5 40. 8-2(5-9g) = -128 8 - 10 + 18g = -128 -2 + 18g = -128 18g = -128 + 2 18g = -126 g = -126/18 g = -7 41. (3/5)k - 1/3 = -1 (3/5)k...
*December 14, 2014*

**7th grade math**

Can you check these? 3. Simplify (56/8+3)*2-1 Ans = (7+3)*2-1 = 10*2-1 = 20-1 = 19 9. A spool of lanyard is 21 yards long. If it is cut into pieces that are each 1.75 yards long, how many pieces of lanyard will there be? Ans:21/1.75 = 12 pieces 12. (3/5)x - 10 = 1/6 Ans: (3/5)...
*December 14, 2014*

**7th grade math**

Thanks! didn't realize it copied twice.
*December 9, 2014*

**7th grade math**

Can you check these? 1. A recipe for chocolate pudding calls for 1 ¼ cups of milk. The recipe makes 3 servings. How many cups of milk are needed to make 9 servings? Ans: 1.25/3 = x/9 3x = 9*1.25 3x = 11.25 x = 11.25/3 x = 3.75 or 3 3/4 cups of milk 2. Two trees in Mrs. ...
*December 9, 2014*

**7th grade math**

I'm confused and not sure of the difference. When do i use the ratio vs when do i have to add ratios? I posted a couple of questions like that and was told they were wrong. Example#4. 5 out of 6 students prefer pepperoni to sausage. If Ms. Greene has 120 students, how many...
*December 6, 2014*

**7th grade math**

Can you check these? 1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate? Ans: 15/2 = 7.5 = 7.5 * 10 = 75 minutes 2. If the ratio of Type O to non-Type O...
*December 6, 2014*

**7th grade math**

Thanks for the explanations!!
*December 6, 2014*

**7th grade math**

Can you check my homework? (wasn't really sure about #4 and #6) 1. Tekell ate 10 pieces of candy in the same time that Mackensay ate 4 pieces. How many pieces will Tekell have eaten when Mackensay eats 6? Ans: 10/x = 4/6 4x = 60 x = 15 pieces of candy 2. Savannah made $102...
*December 6, 2014*

**Trig- math**

@Steve, I plugged in the numbers in the equation. I see where I went wrong. Thank you!
*November 23, 2014*

**Trig- math**

@Damon, thank you! :)
*November 23, 2014*

**Trig- math**

Find the area of a triangle if the sides of the triangle have the lengths 849mi, 930mi, and 1301mi. Here's my work: a=849 b=930 c=1301 A=.5(849)(930)sinA sin A = 394,785 mi^2 (this number doesn't seem right to me, can you explain to me what I did wrong)?
*November 23, 2014*

**Trig**

UPDATE: I figured it out.
*November 23, 2014*

**Trig**

I need help with my vectors unit. I'm really confused about how to set them up. Please help. a.) Given u=2i-5j and v=-i+3j, determine -6u-3v? b.) Find the component form of v if |v|=4 and the angle it makes with the x-axis is 60 degree. c.) Given u=5i+3j and v+3i+2j, find...
*November 23, 2014*

**Physics**

A projectile of mass 0.99 kg is shot from a cannon. The end of the cannon’s barrel is at height 6.6 m, as shown in the figure. The initial velocity of the projectile is 9.2 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel...
*November 23, 2014*

**Math (trig)**

Thank you!
*November 23, 2014*

**Math (trig)**

The distance from home plate to dead center field in a certain baseball stadium is 409 feet. A baseball diamond is square with a distance from home plate to first plate base 90 feet. How far is it from first base to dead center field? I also need help setting this up.
*November 23, 2014*

**Math (trig)**

thank you
*November 23, 2014*

**Math (trig)**

A force of 35lb is required to hold a 72lb toolbox on an incline. What angle does the incline make with the horizontal? Please help me set this up.
*November 23, 2014*

**Math- Combinations **

A math department is allowed to tenure 4 of 19 eligible teachers. In how many ways can the selection for tenure be made? n!/(n-r)!r! = 4!/-15!19!
*November 18, 2014*

**Algebra 1**

Would it be y=(-1)^x?
*October 31, 2014*

**Algebra 1**

Write a rule for a nonlinear function such that y is negative when x = 1, positive when x = 2, negative when x = 3, positive when x = 4, and so on. The entire problem confuses me. I have no idea what its even asking besides it wants an equation.
*October 31, 2014*

**7th grade math**

Can you check my answers? 1. 48lbs 6oz - 19lbs 9oz = 47lbs 22oz - 19lbs 9oz Ans: 38lbs 13oz 2. 3weeks 5days x 8 = 24weeks 40days; 40days=8weeks Ans: 32weeks 3. 49 people are in line to see a movie. 17 are in front of Jackie. How many are behind her? 49 - 18 = 31 Ans: 31 people...
*October 30, 2014*

**7th grade math**

Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of $18. What is the fewest number of subscriptions that can be...
*October 17, 2014*

**7th grade math**

Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of $18. What is the fewest number of subscriptions that can be...
*October 16, 2014*