Saturday

July 26, 2014

July 26, 2014

Total # Posts: 543

**physics**

Average destance between Earth and the moon is 384 790 km. How many days would it take sound to travel to the moon?

**physics**

Vibration of the dishwasher causes standing waves in a cup. crests form four concentric rings and the diameter of teh cup is 6.0cm v=1.5m/x . What is teh frequency of the vibrations?

**math**

Keno is a casino game in which the player has a card with the numbers 1 through 80 on it. The player selects a set of k numbers from the card, where k can range from one to fifteen. The "caller" announces twenty winning numbers, chosen at random from the eighty. the ...

**math**

My son is doing this in 6th grade math class. Mr. Weiss started painting the kitchen at 8:45 am and finished painting at 12:00 pm. About how many hours elapsed between the time he started painting and the time he finished painting the kitchen? Answers are 2h, 3h, 4h, and 5h. H...

**history**

I am helping my son who is in the 6th grade. He has a crossword puzzle that relates to early civilization and the clue is different. We have this much so far ???e??? for a total of 7 letters with an e in the middle please help.

**physics**

+ 8 going with wind - 4 against the wind -4+8/2 = 2 is the average speed

**Chemistry **

Thank you so much drbob! Your explanation make sense! :D

**precalc**

find two functions f and g such that (f+g)(x) = 5 and domain of f + g is [0, infinity)

**math**

use intermediate value theorem to show f(x) has a zero f(x)= x^5 - 4x^4- 7x^2 - 6x; [-0.7, -0.6]

**math**

use intermediate value theorem to show f(x) has a zero f(x)= x^5 - 4x^4- 7x^2 - 6x; [-0.7, -0.6]

**pre calculus**

given points (0,0) (0,5) vertical asymptote of (-1,1) and horiz (2,1) how do I find the equation??????

**pre calculus**

solve in real number system x^3 + 5x^2 - 12x = 14 =0

**pre calculus**

find the bounds on the real zeros????? f(x) = x^5 - 5x^4 +8x + 2

**Calculus**

use the intermediate value theorem to determine whether there is a zero f(x) = -3^3 - 6x^2 + 10x + 9 ; [-1,0]

**precalc**

convert into equation with 0 on right hand side sq route (x+6) = 6-2 sq route (5-x)

**chemistry**

S2(s)+H2(g)=H2S(g)

**algebra 2**

i need help solving these inequalities i'm not sure if i should factor things out or not 4x^3 is greater than or equal to 16x and 4 is greater than or equal to 2x^3 + 8x

**Physics**

99.48 km/h

**4th grade math**

the answer is 1232 as two of the digits should be same also

**Chemistry**

oh ok thanks i got .09 i hope thats right

**Chemistry**

The question said to use dimensional analysis...

**Chemistry**

(0.75 moles Al(NO3)3/L Al(NO3)3) x 0.040 L Al(NO3)3 = ??moles Al(NO3)3 I am unsure how to find the factor to convert moles Al(NO3)3 into moles NO3. i think that if i do the first section, you get .03 moles as your answer for moles of Al(NO3)3, but I am not sure. how can i conv...

**chemistry**

use dimensional analysis to find how many moles of nitrate ions are in 40.0 mL of a 0.75 M aqueous solution of aluminum nitrate

**geometry**

If CD is parallel to AD, then CD meets AD at D. But parallel lines never meet!

**physics**

A 1,200-kg car runs into the rear of an 1,800-kg minivan that was moving at 6 m/s. The two vehicles are locked together after the collision and move with a speed of 12 m/s. How high above the ground would the locked- together vehicles have to be raised in order for their poten...

**psychology**

use the book

**MATH**

(1/6)to the power of 3x = 36 to the power of 2-x

**MATH**

What is the 9th term -1/18 1/6 -1/2

**MATH**

Convert 322 degrees to radians

**College algebra**

At least, from the sign of a, one can tell whether it is concave upward or downward a>0 => concave upward.

**science**

4. Why do we tend to assume that natural chemicals are safe while industrial chemicals are evil? Is this correct?

**english**

I have been working on this and am still confused. Which sentence is correct. Using the pronoun case- A) My brother knows more about technology than me. B) My brother knows more about technology than I. I thought it would be best for B and add to it the word do at the end but ...

**chemistry**

how much energy is released when a 5600 gram sample of water cools from 99 degress celsius to 28 degrees celcius

**Physics**

An elevator is moving down with an acceleration of 2.46 m/s^2. What would be the apparent weight of a 66 kg man in the elevator?

**History**

I am totally stumped. The picture we are to look at is called Five generations of slaves in South Carolina. The picture shows a family outside their home. The questions we are asked is to 1-make inferences about the owner of the plantation that is showin in the image 2-do you ...

**Management**

How does management style influence the working environment at MTV ?

**history**

What impact did the War of 1812 have on the American Federal Government? My answer is that it strengthened it with economic opportunities, diplomatic avenues, and nationalism. Is this correct?

**history**

What is the significance of Alexander Hamilton's financial program? How did Hamilton's financial program play a role in the creation of a two-party political system? My response to the first was that he wanted to increase the nations finances and to make sure there wou...

**8th grade science**

Tyler put a cube of blue closed cell foam in a syringe and clamped the the end closed, what happened to the particles outside of the cube?

**history**

Explain how the existence of the Confederate government played a role in the development of the current constitution. I feel that the articles of confederation joined the states to gether- uniting America and creating a government that was elected by the people with powers gra...

**Engineering Physics**

A 1.0-kg block is released from rest at the top of a frictionless incline that makes and angle of 37 degrees with the horizontal. An unknown distance down the incline from the point of release, there is a spring with k=200 N/m. It is observed that the mass is brought momentari...

**calculus**

Suppose A is a positive real number and mA is the average value of (sin(Ax))3 on the interval [0; 2]. Compute mA. what is lim mA as A goes to infinite?

**algebra**

addition method:3x-5y=-2 and 5y-2x=-2 how would I solve it since they are not together?

**Science. Please Help!**

A completely liquid solution of KCl suddenly begins producing solid crystals (as precipitate) when one crystal of KCl is dropped into it. The original solution was

**Science**

What is the defenition of the word dissolve?

**Physics**

Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 170 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to their real wei...

**cultural diversity**

what is acculturation

**history**

From where did early North Americans migrate and how did they reach North America? Describe the lifestyles of early North American men and women. Im not sure which way to answer this one. I have two answers. The first was coming from Asia and crossing the land bridge at the be...

** Urgent!!! Physics**

Andrea, I think you shouldn't have waited til the last minute for that mastering physics homework thats due at 11:59pm

**math**

is y=2^x^2 considered a double exponential function or not? I believe it is but am not sure since the exponent is x and that is squared. I think to qualify as exponential function wouldn't the x need to be a number and not x?

**math**

I had to repost this since I hit the submit button by mistake Use patterns or a linear equation to complete the table. column x 1,3,5,10,50,100 column y -1,3,7,?,?,? I tried several combinations using -3,2,and -1 in place of m but still not coming out right. Our options for th...

**math**

Write the answer to the problem as an algebraic expression. The product of two numbers is 30. One of the numbers is r. What is the other number? Our choices are: a) r/30 b) 30/r c) 30-r d) 30r I believe the answer is b but am thinking it may be c, any help?

**math**

find the slope of the line through the given points (8,-2) and (8,-1) when i do the math I come up with 1/0 as the slope making that infinite. Our choices for the answer are: a)0 B) 1/16 c) 3/16 d) no slope would the answer be d since the slope is infinite?

**math**

Determine if the relationship represented is linear. x=5,10,15,20,25,30 and y=50,60,70,80,80,90 I could not find a relationship that worked for all the numbers so I would say it is not linear. Correct?

**alg. 2**

complete the square... x^2-16x+4=0

**math**

Give the slope and y-intercept for the line represented by y=3x/2

**English**

Thank you I did not mean to spell speak wrong.

**English**

So which way is correct? The teacher will speack about the homeless in Florida. Or The teacher will talk about the homeless in Florida.

**English**

The teacher will talk about homeless in Florida. Or is it better to write it this way? The teacher will speak about homeless in Florida.

**math**

State the solutions, or estimated solutions, to each quadratick equation. We have equation is x^2-9x+20.25=0 and the graph is y=x^2-9x+20.25 Not sure how to figure this one out. I assume I just solve the equation and not the graph to get the ordered pairs?

**math**

Using the formula v=20(1.222)^t and v is the value and t=0 which is the year 1971. What year will the set be worth 1500? I input this into the formula to get 1500=20(1.222) The 20(1.222) is 24.44 not sure how to figure out the year. I believe I just add the 24 years to 1971 to...

**math**

Tell if the relationship is linear? Write the equation for the relationship. values for x are showing 1,2,5,8,10,11 values for y are showing 1.5,2.5,5.5,8.5,10.5,11.5 I could not get any relationship I could think of to make these linear. I tried y=2x just to name one of them ...

**math**

Give 5 possible dimensions for the following rectangle with the perimeter given. Perimeter= 12x+20

**Algebra**

(2-3i)(1-i)-(3-i)(3+i)

**math**

Multiple choice question. Describe all symmetries of a square. A) 2 lines of reflectional symmetry B) 2 lines of reflectional symmetry, 180 degree rotational symmetry C) 4 lines of reflectional symmetry D) 4 lines of reflectional symmetry, 90 degree rotational symmetry I belie...

**math**

5 liters of water= ____ kg liters and kg are 2 different types of measurement but 1 liter of water is 1 kg so would this make the answer then 5 kg or would it not be able to be solved since 2 different types of measures?

**math**

Looking at a basketball court diagram. The shaded area is the free throw lane and the arc that is attached to the lane only. Find the shaded part of this diagram. The foul line is 15 ft from the basket which is 4 ft from the end line. The lane is 12 ft wide. I am not sure I un...

**math**

find the shaded area in the circle with a rectangle ( 3 x 4 ft dimension) inside the circle. I don't understand how to figure out the shaded area which is all the space between the circle and the rectangle?

**math**

looking at a square pyramid, if the size of the base remains the same and the height of the pyramid varies what are the minimum surface area and minimum volume the pyramid can have? The base is showing 2 in and the line on the right side of the base which I believe is also sti...

**math**

find the perimeter of a square with a diagonal of 6 square root 2 in. I am not sure how to figure out this perimeter.

**accounting**

Case 1. Bona Bonjela's Salary per year = $45,500 Leslie Bonjela's Salary per year = $18,500 Interest of deposit per year = $23,660 Income = $87,660 a) Bona and his wife earn $64,000 amount per annum when Bona Bonjela works as a bricklayer and his wife, Leslie works in ...

**math**

If square ABCD has a larger area than rectangle EFGH, does it follow that ABCD must have a perimeter larger than that of EFGH? Why or why not? I believe it will have a larger perimeter that the other, is this correct?

**math**

5 sq ft= ___ in I have that this converts to 720 square inches but cannot convert it down to inches. I have no clue how to break this down to inches since square deals with area and we don't know the sides. Is it possible to break this down to inches?

**geology**

Name a region where one should expect to find lineated and foliated metamorphic rocks. I believe the rocky mountains would be a good answer, is this correct?

**geology**

Do you suppose that the geologic age of calcitic marble could be determined from its fossil content as can be done with fossiliferous limestone? My answer is yes am I correct

**geology**

Apart from the composition of the rock itself, what climate do you imagine is more conducive to physical weathering? and Chemical weathering? I know physical weathering is from wind and water transporting the eroded rocks and particles. Chemical weathering is water transportin...

**geometry**

what are the symmetry properties of a regular octahedron and a cube?

**math**

what are the different axes of rotational symmetry for a pentagonal pyramid?

**math**

how many axes of rotational symmetry does an equilateral triangle have (it is shown in 3d style)

**geometry**

determine why Euler's formula continues to hold for the polyhedron formed by cutting corners off of an octahedron. a) for an octahedron V=__, F=__,E=__ b) when you slice off one corner of the octahedron, you (gain or lose)__ edges. C) therefore, the total change in V is __...

**geology**

If granite were melted in the laboratory, what would be the order in which its minerals would melt. The minerals inside are: most complete large crystallized mineral is X next complete small cryastallized mineral is Z next to least large crystallized mineral is Y least crystal...

**geology**

Judging from the sizes of the before-and-after craters atop Mount St. Helens, which volcani event appears to have been more explosive, the last one before 1980, or that which occured in 1980? I thought it would be the one before 1980 since that would have created the upheaval ...

**algebra**

278

**math**

Which quadrilaterals have a)perpendicular diagonals b)opposite angles congruent? c) two pairs of parallel sides? d) a pair of congruent, adjacent sides? My answers a)rhombus and square b)rhombus, square, and parallelogram c)parallelogram, rectangle, and square d) at first I th...

**math**

We have a circle that has 270 degrees listed outside the circle at the top left. Inside the circle at the bottom right side is a an angle inside the circle with a P. Find the measure of Angle P. Would this be that we take 360-270 to get the measure of Angle P?

**math**

Not sure how to answer this m(<1)=4x +10 and m(<7)=6x+4, what are the measures of angles 1 and 7?

**math **

draw a 16-mile trail map with five locations where a hiker could start at any location, walk all 16 miles, and return to the same location without walking over any trail twice. I am confused here. At first I thought I would draw the map with the stops making a house type forma...

**algebra**

Solve for x: (-1/3)(-4+3x)=1/2

**9th grade**

what is it called when chemicals that influence the way that neurons communicate communicate with each other

**math**

Four well-defined social classes (1=low and 4=high) exist in a country. If X is a random variable giving the social class of the son of a father from social class 1, the distribution of X is as follows: we have a small chart that has son's class, X and a 1,2,3,4 next to it...

**math**

How many games are played in a women's soccer conference if there are eight teams and all teams play each other twice? I figured 8x7x2=112 since this is 8 teams and 7 opponents per team and playing twice am i right?

**math**

How many different license plates could be made if they have one or two letters followed by 1,2,or 3 digits? Reptetitions are allowed. I figured that 26 would be for 1 letter and 52 for 2 letters so (26+52) but not sure how to figure the numbers part.

**math**

The numbers 1-10 are placed on cards, and the cards are put in a hat. If two cards are drawn, in order, without replacement, what is the probability that one number is even and the other a prime? I know there are 4 primes-2,3,5,7 and 5 even numbers 2,4,6,8,10 not sure how to f...

**math**

Two cards are drawn without replacement from a deck of 52 cards. What is the probability that both are tens, if the first card was a ten?

**math**

Two cards are drawn without replacement from an ordinary deck of 52 cards. What is the probability that the second card is a face card, if the first card was a queen? Would this be 11/51?

**math**

A lottery game has balls numbered 1 through 15. If a ball is selected at random, what is the probability of selecting a ball showing an even number or the number 12? I thought the answer would be 7 even numbers and 1 for the 12 which would be 8/15 is not an option for the answ...

**math**

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue? I have seen so many different answers on this site to this question and am not sure. I thought it would be 7 red ...

**math**

On a bar graph the average cost of renting a studio in one city in years 1994 through 1998. The graph goes from 0 to 600. Year 94 is up to 400, year 95 is up to 500, year 96 is up to 500, year 97 is up to 525, and year 98 is up to 550. By what percentage does the average price...

**geology**

What is the minimum age of Earth. We are given a hint of: If the age of Earth were equal to one calendar year, the 1492 arrival of Christopher Columbus in America would have occurred at five seconds to midnight Dec. 31. That confuses me even more.

**math**

If P(A) = 2/3, P(B) = 1/6, and P(A and B) = 0, what can you say about P(A or B)? Not sure how to answer this one.

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