Thursday
April 17, 2014

Posts by bob


Total # Posts: 2,359

Math
Find two numbers whose sum is 90 and one-third of the smaller number is equal to one seventh of the larger number

calculus
integrate xsin(2x)dx=

calculus
if the region enclosed by the y-axis, the line y=2 and the curve y=the square root of x is revolved about the y-axis, the volume of the solid generated is????

cdemistry
2.20

Biology
A space probe discovers a planet inhabited by creatures who reproduce with the same hereditary patterns as those in humans. Three phenotypic characters are height (T = tall, t = dwarf), hearing appendages (A = antennae, a = no antennae), and nose morphology (S = upturned snout...

math
Use four 4s to make all the numbers from 0 to 50 example 4+4 6=4+---- 4 use any mathematical signs but four 4s may be used for each number

algerbra
what is the degree of the polynomial 8x^5y^4-2x^8

cambo
180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is six times as long as the first. What is the length of the first piece of the board?

Math
Solve: 3x-2(3x-1)+4(x+1)=0

Physics
Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

Physics
Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

Math
A clown was shot out of a cannon at ground level. Her height above the ground at any time (t) was given by the function h(t) = -15t2 + 15t What was height at t(1), t(2),and t(3)? The flight will last how many seconds??

physics
A 25.1 g marble moving to the right at 22.9 cm/s overtakes and collides elastically with a 12.1 g marble moving in the same direction at 11.3 cm/s. After the collision, the 12.1 g marble moves to the right at 25.1 cm/s. Find the velocity of the 25.1 g marble after the collision

physics
A spring with spring constant 21 N/m is stretched 0.35 m in the positive x direction, referring to the figure. What is the spring’s restoring force (with its sign)?

physics
A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at θ = 54.0˚ with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and (c) angle (...

math
Find the expected value of a $1 bet in six-spot keno if three winning spots pays $1 (but you pay $1 to play, so you actually break even), four winning spots pays $3 (but you pay $1 to play, so you profit $2), five pays $100, and six pays $2,600.

geometry
what does 44 feet by 9 feet by 8 feet mean

physics
7.84*10^10

Calculus - Functions?
a billion

Science
What type of plate boundary is located at the Juan de Fuca plate and Washington state on the north American plate?

math
(radical d)!=24

The United States Until 1877
We actually do not have a book. It comes from in class lectures that we take notes on. however, missing one note that you might not write down throws you off alot.

The United States Until 1877
I am completely clueless on where to start. Its for a study guide to help us prepare for a test.

The United States Until 1877
Compare and Contrast the development of the New England, Middle, Chesapeake, and Southern Colonies. Discuss the economic, religious, and social development of each from first settlement by the British to 1750.

us history until 1877
By 1700 the British colonies on the North American mainland were remarkably different, and in many ways isolated from one another. As late as 1760 Benjamin Franklin declared that a union of the colonies was “not merely improbable, it is impossible,” because the colon...

physics
bob

pre-algebra
a bag contains 5 green marbles 2 white marbles 8 blue marbles 9 red marbles and 6 black marbles what is the probability of drawing a white marble replacing it and then drawing a green marble? Answer choices A 1/6 B 1/15 C 1/87 D 1/90 I think its D, but I am not sure and how di...

geometry
idk...

math
draw pattern block with a total of 22 sides

Math
What is the length of a rectangular lot that has a perimeter of 1400 m and a width of 100 m?

physics
A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of th...

physics
A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of th...

geometry
What Is The Area Of A Circle If The Radius Is 10 Inches?

art101
1. CheckPoint: Greek and Roman Architecture • Resource: Ch. 15 of A World of Art • Write a summary comparing the characteristics and innovations of each Greek and Roman architecture in 200 to 300 words. • Provide two representative examples of architecture for e...

College Electric Physics
(a) What is the electric potential energy in joules of two electrons separated by 1.98 nm? (b) What would be it be if the separation was doubled?

Physics
A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

Algebra
What is the area of a circle whose diameter is given by the expression 10x?

Physical Science
69

math
Forrest Lumber uses the function S(t) = -75t + 375 to determine the salvage value S(t), in dollars, of a table saw t years after its purchase. How long will it take the saw to depreciate completely?

math
Samantha can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?

English 1
tgfrvh,ki

English 1
do your own work

English 1
do your own work

math
two girls caught 25 frogs. lisa caught four times as many as jen did. how many frogs did jen catch

MATH
a golf ball dropped onto a hard surface rebounds exactly 1/3 of the height from which it falls. how far will it rebound after hitting the surface for the third time if it initially dropped from a height of 18 feet

math
two girls caught 25 frogs. Lisa caught four times as many as Jen did. how many frogs did Jen catch

math
company claims 10% are green. suppose that candies are packaged randomly into samll bags of 50. school children studying percent open several bags, count colors and find the proportion that are green. a. is the Normal model appropriate here? explain b. where is the center? usi...

Science
the candy nerds

Science
what about nerds

math
51/17

algebra 1
5m-m+8+=0

Math
simplify: 5-s(4-7)+3s show steps

Chemistry
If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. a. [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M b. [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M c. [C6H12] = 0.241 M, ...

Pre-Algebra
I don't get it because the choices are A. 25 mins B. 35 mins C. 85 mins D. 1500 mins

Pre-Algebra
I don't get it because the choices are A. 25 mins B. 35 mins C. 85 mins D. 1500 mins

Pre-Algebra
Cheng drives 25 miles on a highway at a constant rate of 60 miles per hours. Jow much time does the trip take?

math
n + (n + 1) + (n + 2) =45

computers
When you press the power button on your computer, it doesn’t turn on. There is nothing…silence…absolute zero. There are no beeps, no whistles, nothing. The monitor is getting power and the power strip is turned on. 1.Draw a diagram of the wiring scheme based on ...

4th grade math
38 is the answer

4th grade math
38 is the answer

science
object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

science
object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

Math
3p^2+4P^2=63

Math
3p^2+4P^2=63

math
3p^2+4P^2=63

Math
The distance between the points (14,-18) and (15,-8) is? The point (a,b) is such that (14,-18) is the midpoint of the segment from (15,-8) to (a,b). Then a and =?

chemistry
Nevermind, the correct answer was at the top of the next page so I didn't see it.

chemistry
Nope, it was 10 degrees C, which is why I'm stumped. I didn't think any of the answer choices were right, either.

chemistry
Which of the following constants are needed to calculate the change in enthalpy (H) for heating a sample of liquid water at 10C to steam at 150C. I) the heat capacity of water II) the enthalpy of fusion of water III) the heat capacity of ice IV) the enthalpy of vaporizatio...

chemistry
thanks

chemistry
I think that's what I'm looking for.

chemistry
I, IV and V only 005 10.0 points When a chemical reaction comes to equilibrium, both the forward and the reverse reactions continue, but their rates are equal. For such a system at equilibrium at 300 K and 1.00 atm pressure, the change in Gibbs free energy as the forward react...

math
if a triangle has side lengths of 6cm, 9cm and x cm, what are possible values for x?

physics
I'm sorry I meant 1.5J

physics
The answer is 15J

MATH
A is the midpoint of BC. BA=2x+5 and BC=5x-3. solve for x and find the length of BC

physics
20

honors chemistry
no, that is what i meant to type, that's just the question on my homework

honors chemistry
Which gas has solubility in water (at STP) of 3.39 L at 10.0°C?

9th grade alegbra
The sum of two numbers is 90.their difference is 18.find the numbers.

science
if earth is one astronomical unit from the sun and has a period of 1 year, approximately how far is planet X form the sun if it has a period of 26 yearS

math
Dents and Dings Auto Body buys paint with a list price of $29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?

chemistry
In one mole of the compound nitrogen diox- ide, what fraction of the total number of ions is the nitrogen ion?

Math
write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

math
??????

Physics
A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 86 N parallel to the incline, which makes an angle of 30 ° with the horizontal. Assuming the coefficient of kinetic friction is 0.4 and the crate is pulled a distance of 7.5 m...

trig
what is the value of the discriminant x^2-9

Physics 12th Grade
Two girls with masses of 50.0 kg and 70.0 kg are at rest on frictionless in-line skates. the larger girl pushes the smaller girl so that the latter rolls away at a speed of 10.0 m/s. What is the effect of the action on the larger girl? What is the impulse that each girl exerts...

chemistry
A solution of ethanol (C2H5OH) in water is prepared by dissolving 87.4 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?

Geometry
Find the surface area of a right octagonal pyramid with height 2.5 yards, and its base has apothem length 1.5 yards.

Physics
990 N

GENERAL ART
HOW DO YOU DRAW 3 D BOXES

7th Pre-Algebra Word Problem
Thanks

7th Pre-Algebra Word Problem
Approximately one-seventh of the people in the United States are left-handed. The population of the United States is about 300 million. Write and solve an equation to estimate howmany people in the United States are left handed.

Physics
Two brothers are jogging, Josh and Drake. Josh has 1/2 the KE of Drake. Also, he is twice the mass of Drake. Plus, Josh had to increase his speed by 1.35 meters/second to achieve the same kinetic energy of Drake. What is the initial velocity?

Math
prove that two triangles are congruent if they have 2 equal adjacent angles and the side inbetween them is also the same.

math
find three rational numbers between the negtive square root of 26 and the negtive square root of 15 and explain how you got the answer

Math
prove that two triangles are congruent if they have 2 equal adjacent angles and the side inbetween them is also the same.

math
Find the range of possible measures if each set of expressions represents measures of the sides of a triangle:x 2x+10, x+8

Language arts
Figurative language

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