Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 1,665

**math (algerba 1)**

A motorboat can travel upstream on a river at 18km/h and downstream at 30km/h. How far upsteam can the boat travel if it leaves at 8am and must return by noon?

**Math**

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane crised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?

**math**

thanks. I though because you added 70t and 80t there would be 2ts. But no.

**math**

Never minds. I see my mistake. It's really 6 hours.

**math**

Two trucks left buck's trucks traveling in opposite directions. One truck traveled at a rate of 70km/h, the other at 80km/h. After how many hours were the trucks 900km apart? I got 3 hours as my answer, but I dont think that's right...

**math**

neverminds. I got it.

**math**

Reiny, how can you show me how to do the last part wirten out? Thank you so much!

**math**

ok

**math**

Also, how far had steve traveled when his brother overtook him?

**math**

thanks

**math**

Steve McSpoke left home on his bicycle at 8am, traveling at 18km/h. At 10am, Steve's brother set out after him on a motorcycle, following the same route. The motorcycle traveled at 54km/h. How long had steve traveled when his brother overtook him?

**math**

yes thats it.

**Science* Please Help Me !**

Thank You Very Much !!!! Rylee your the best

**Science* Please Help Me !**

How would cell division help heal a broken bone? Why do cuts and disappear when in the process of cell division? What is the main purpose for cell division?

**univ. physics**

An Otto engine has a maximum efficiency of 33.1 %; find the compression ratio. Assume that the gas is diatomic.

**univ. physics**

A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal)

**math helpp!!!**

Bernie put in a garden in her back yard. The garden has a perimeter of 265 feet. She wants to know the total surface area of the garden and all she knows is the perimeter and that the width is 20% or (1/5) of the length. (Remember 20% and the fraction 1/5 is the same decimal v...

**Algebra**

Can you help me set this up? Mr. Smith could ride his 10-speed bike 4.8 miles to his mom's house in 11 minutes. His return trip home took 14 minutes. The times are different due to there being a slight downhill slope on part of the trip to his mom's house. If Mr. Smith...

**Algebra**

Log5(x+3)(x-2)=log5(14) (X+3)(x-2)=14 X^2+x-6=14 X^2+x-20=0 (X+5)(x-4)=0 X=-5, x=4 -5 is not a true solution because you can't take the log of a negative number X=4

**Math**

Thank You Very Much !

**Math**

(3+4)^0 + 3-5^-3 (-4)^-3 * (-2)^3 (23^3)^15

**physics**

suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?

**physics**

suppose that a seat-belted mother riding in an automobile holds a 10 kg baby in her arms. the automobile crashes and decelerates from 50km/h to 0 in .1 s. what average force would the mother have to exert on the baby to hold it?? do you think she can do this?

**physics**

A rule of thumb for automobile collisions against a rigid barrier is that the collision lasts about .11 seconds, for any initial speed and for any model of automobile. accordingly, the deceleration experienced by an automobile during a collision is directly proportional to the...

**math **

Sue was in excellent shape in high school, she could ride her 10-speed bicycle 4.8miles to her grandmother's house in 11 minutes. Her return trip home took 14 minutes. The times are different due to there being a slight downhill slop on part of the trip to her grandmothers...

**Algebra 1**

Thank you!!!

**Algebra 1**

Can you help me set this up? Suppose you are trying to decide whether to buy ski equipment. Typically it costs $60 day to rent skis and buy a lift ticket. You can buy ski equipment for about $400. A lift ticket alone costs $35 for one day. Find the break-even point. Thanks.

**Math**

Thank you for your help!

**Math**

If X = 12 units, Y = 10 units, and Z = 14 units, then what is the surface area of the right triangular pyramid shown above?

**7th grade Math**

Thom has a scale model of his car. The scale is 1:12. If the actual car has 16-inch wheels, what size are the wheels on the actual scale model?

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ma...

**Physics **

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ma...

**Physics**

part 1 of 3: A hawk flies in a horizontal arc of radius 9.9 m at a constant speed of 4.8 m/s. Find its centripetal acceleration. Answer in units of m/s^2. part 2 of 3: It continues to fly along the same horizontal arc but increases its speed at the rate of 1 m/s^2. Find the ma...

**Algebra**

Can you please help me with this? Convert 36.7 lbs/in(3) to kilograms per cm(3). (There are 14.59 kilograms in 32.174 pounds and 61.02 in(3) in 1000 cm(3)). Thank you!

**7th grade science**

mrs.sue....

**7th grade science**

help somebody

**7th grade science**

Hello....

**7th grade science**

Can someone please help me out with this question by explaining why that answer choice is the answer to this question. Thank you for your time and help.

**7th grade science **

Q: An igneous intrusion cuts through three layers of sedimentary rock. which rock is the youngest? and why? A: A) the igneous intrusion B) the top layer of sedimentary rock C) the middle layer of sedimentary rock D) the bottom layer of sedimentary rock

**math**

The answer is, each fruit snack costs 20 cents.

**biomechanics**

did u manage to work this out?

**Chemistry**

mass percent by difference would be 100- (11.37+12.24+28.01)

**statistics**

A bag contains a total of 24 white, red, and blue marbles. A student randomly selects a marble from the bag, records the color, and then returns the marble to the bag. The student repeats the process 24 times. The bar graph shows the results of the student's experiment an...

**english**

Hello! say i got 54 out of 75 points on a test... what would my grade be (A,B,C,D,or a F). thanks!

**algebra**

Ben Cole was hired to shovel 100 tons of coal. He has been shoveling coal at a rate of 16 tons per day. After 3 days his brother Char joins him so they can finish the job faster. Char can shovel 10 tons per day. Find the amount of the 100 tons shoveled by each brother and the ...

**algebra**

The stock of Company A is valued at $18.20 per share. The company's earnings for one year amounted to $2.80 per share. If Company earned $3,360,000 in that year, what was the total value of its stock?

**math**

what is the trem for 3,500*1,500 the value

**math- surface and volume**

If volume increases by 60%, how much does the surface increase by? Please show work.

**math**

A certain computer can perform 105 calculations per second. How many calculations can it perform in 10 seconds?

**math**

When you do the subtraction shown on the right 4,126 - 2,487, you regroup 1 thousand to 10 hundreds. Does that give you 11 hundreds? Explain

**honors chem high school**

The topic is Changes in energy Level Calculations. calculate energy value for levels n=1 to n=7; given En=-Rh/n2 R=2.180 x 10 -18 J E=hv h=6.626 x 10 -34 J.s I then need to plot them -- I cannot get started.

**Math - weighted average?**

This made a lot of sense, thank you for responding! It was able to incorporate it into my program and it seems to work.

**Math - weighted average?**

I need to create some type of formula that will allow me to interpolate values at specific points in a data set. My data is something like this: I have a list of times, and there are values associated with those times like this: T Readings 1 100 103 105 2 103 101 107 3 102 104...

**english**

#8 is actually A

**Physics **

Jumping flea. For its size, the flea can jump to amazing heights-as high as 30 straight up, about 100 times the flea's length.

**calculus HELP**

Find the values of a and b that make f continuous everywhere. f(x) = (x2 − 4)/(x − 2) if x < 2 ax2 − bx + 3 if 2 ≤ x < 3 4x − a + b if x ≥ 3 solve for a and b? HELP ive tried everything

**spanish**

1. Write a conversation between two friends. One friend invites the other to do an activity (something from this unit) and the other friend agrees to do the activity. Then a third friend joins them and they invite that friend who has to decline because he has something else to...

**Chemistry pls help!!**

A 32mL solution of 2.7M NaCL is mixed with 83mL of 1.8M HCL. What is the molaritt of the CL in the new solution. Thank you for your help

**civics**

okay thank you for your help and sorry again for the details

**civics**

the U.S. sorry for the confusion!!! my bad

**civics**

What three rivers meet together and form the largest waterway??

**cicivs**

help me, me, me, me, me, me,me!!!!!! please, please, please, please, please, please, please!!!!! help, help, help, help, me, me, me!!! thank, thank, thank, thank, thank, thank, you!!!!

**cicivs**

does hawaii have waterways? If yes, please name the waterways of hawaii and how it can help to shape the lives of people living in Hawaii. Please somebody help me because I looked all over my online civics book and i did research on waterways of Hawaii and I still cant even fi...

**chemistry**

A chemist want to make a 10% Chlorine solution from 30% Chlorine solution and pure water. How much of the two should the chemist mix together to make 20mL. Please help with calculations. Thank you

**math**

I have to go through all the steps and find the midpoints and then the equations of the medians and then do substitution

**math**

Really need help please!! triangle CDE has vertices C (-2,4) D (6,2) and E (-4,-2) determine the exact location of the centroid

**ashworth**

The Tao Inc. purchased an asset for $170,000 with a salvage value of $8,500 have a useful life of four years. Find the depreciation expense for the first year using the 150% declining balance method.

**Physics**

A block on a spring moves in SHM with amplitude 0.23 m and period 3.8 s. The mass of the block is 2.1 kg. What is the total energy of the system? Can someone please take me step by step and show me what my answer should be? Thanks!

**Physics**

A wave has a frequency of 325 Hz. What is its period? I did 1/325 = 0.003076 & I answered 0.003 and this answer was wrong. Can anyone help me?

**Physics**

A potter's wheel rotates with an angular frequency of 1.54 rad/s. What is its period?

**Physics**

The sketch shows a mobile in equilibrium. Each of the rods is 0.16 m long, and each hangs from a supporting string that is attached one fourth of the way across it. The mass of each rod is 0.10 kg. The mass of the strings connecting the blocks to the rods is negligible. What i...

**Science (simple machines)**

The plank is 3.6 metres long. It is being used as a lever to lift a 40-kilogram box. This represents a load of 400 newtons. (a) If the fulcrum were placed in the centre of the plank, what downward effort would the man on the right need to apply to raise the box? (b) If the man...

**Physics**

A building with a weight of 5.200e+7 N is built on a concrete foundation with an area of 1300 m2 and an (uncompressed) height of 2.82 m. By what vertical distance does the foundation compress?

**Physics**

Bob and Ray push on a door from opposite sides. They both push perpendicular to the door. Bob pushes 0.63 m from the door hinge with a force of 89 N. Ray pushes 0.57 m from the door hinge with a force of 98 N, in a manner that tends to turn the door in a clockwise direction. W...

**Physics :)**

A motor lifts a 70.0 kg box off the ground, starting from rest. In 8.00 seconds it lifts the box to a height of 20.0 m. At that time, the box is moving upward with a velocity of 5.00 m/s. What is the average power of the motor during this time interval?

**6th grade math**

Find the volume of the right triangular prism. The bases are equilateral triangles with a length of 6 mm. The height of the prism is 8.4 mm. (Round to the nearest tenth.)

**Parabola**

How do I put this parabola in standard form? Could someone show how they would put it in this form: (x - h)2 = 4p(y - k) 1. 4x^2+24x+128y-988=0 Please help! I'm lost.

**Parabola**

3y^2+24y+72x-96=0 Can anyone put this in standard form: (y - k)2 = 4p(x - h) All help is greatly appreciated! :)

**Pecalculs**

Thank you again! ^o^

**Pecalculs**

Sorry: Precalculus! :P

**Pecalculs**

Can anyone put this parabola into this standard form: x-h = a(y-k)^2 x^2-12x-48y-372=0 ? Please help!

**Parabolas in standard form!**

WOW! Thank you so much! you made more sense than my teacher! :D

**Parabolas in standard form!**

Can you solve this one?: x^2-12x-48y-372=0 & I made a mistake one the second one!! Its actually: x^2+14x+44y+313=0 !!

**Parabolas in standard form!**

Hello, I am having the worst time trying to solve these parabolas and putting them into x-h = a(y-k)^2 form. :( There are two problems that i keep doing something wrong. could someone solve them so I can have a set up for the rest of my problems? :) 3y^2+6y+108x-969=0 and x^2+...

**Ellipse equation?**

Thank you, @Steve ! Would you happen to know how to find the Foci for this equation?!?! :)

**Ellipse equation?**

(x-2)^2 / 49 + (y+1)^2 / 25 = 1 a.) what are the vertices? b.) What are the major and minor axises? I always have troubling understanding how to find these. :( Any help is greatly appreciated!

**The crucible**

In the Crucible, what was john proctor's difficult decision that was somehow related to the society in which he lived in?

**Literature**

sorry wrong answers! Disregard.

**Antigone Literature**

Creon criticizes others for stubbornly refusing to change their minds. Why is this ironic? I believe its ironic because everyone is so caught up in what they think is right, including Creon. I just want another persons opinion on why they think its ironic! :) Its always helpfu...

**History**

Which one of the following would be a primary source??? A) Your history book B) A letter from a soldier C) A picture of pyramaids D) A website about history HELP!!!

**trig**

write sin4xcos2 as the sum or difference of two functions. answers: 1/2(cos6x+cos2x), 1/2(cos2x-cos6x), 1/2(sin6x+sin2x), sin6x-sin2x

**math**

Miss C gives a test to the 10 students in her first-period algebra class. The grades are 93,82,95,86,90,84,89,79,87,93 A. Find the mean and Standard Deviation of the 10 scores. B. List all the reasons for why the late class could have a different mean or standard deviation

**egypt**

how did the egyptians explain the unknown?????????

**Math**

Diana practices the piano 45 minutes each day o Sunday, Tuesday, Thursday, and Saturday. How many minutes does she practice the piano each week?

**history**

also what belief and value did jesus teach

**history**

how big was the city of rome?

**language arts**

Thank you Ms.Sue

**language arts**

How should I fix it?

**language arts**

Is this sentence a run on? An important decision made by Parvana was when Parvana agreed to go outside to buy food while she was dressed as a boy.

**math**

For the sequence 0,3,8,15,24,35.... find a formula for tsubn in terms of n.

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