# Posts by David

Total # Posts: 2,323

Opinion Question
Give me some ideas please. How technology reveals something deeper and essential about human nature: either our strengths or limitations, or both.

math
What will be the height of the house if the tower and the house are 50m apart.

Genetics/Bio
D, B

chem
How many grams of Na2SO4 are present in 500. mL of a 0.750 M aqueous solution? a.70.9 g b.53.3 g c.0.284 g d.106 g e.2.63 g A serum concentration of Mg2+ of 1.75 mmol/L is equivalent to: a.3.50 mEq/L b.1.75 mEq/L c.17.5 mEq/L d.0.875 mEq/L

chem
7.76 g of KBr was dissolved in water. The solution was diluted to a volume of exactly 250 mL. What is the molarity of the solution? 32.2 M a.0.476 M b.0.0652 M c.0.0310 M d.0.261 M

chem
A solution is prepared by adding 25.0 g of methanol to water to make a total volume of solution of 95.4 mL. What is the weight/volume percent of this solution? a.26.2% b.3.81% c.20.8% d.25.0%

chem
At STP a sample of methane gas occupies a volume of 1250 mL. What is the volume of the methane at 100.°C and 760. torr? a.1710 mL b.1250 mL c.915 mL d.1420 mL

chem
I am filing out a study guide and needed coaching on some question. thank you 0.765 g of He is placed in a balloon at 1.15 atm. The balloon expands to volume of 5.00 L. What is the temperature of the balloon? a,3.45 K b,91.6 K c,93.4 K d,366 K

Calc
A manufacture has been selling 1150 television sets a week at \$510 each. A market survey indicates that for each \$13 rebate offered to a buyer, the number of sets sold will increase by 130 per week. a) Find the function representing the demand p(x), where x is the number of ...

Calc
An open box is to be made out of a 10-inch by 16-inch piece of cardboard by cutting out squares of equal size from the four corners and bending up the sides. Find the dimensions of the resulting box that has the largest volume. Dimensions of the bottom of the box:

Calc
Thank you

Calc
A stone dropped into a still pond sends out a circular ripple whose radius increases at a constant rate of 2.6 ft/s. (a) How rapidly is the area enclosed by the ripple increasing when the radius is 4 feet? The area is increasing at

Math
The top and bottom margins of a poster are 6 cm and the side margins are each 7 cm. If the area of printed material on the poster is fixed at 384 square centimeters, find the dimensions of the poster with the smallest area.

Math
A set costs half as much as a book.A book costs 600\$ more than a pen.If the total cost of the three items is 6900\$,find the cost of a set.

maths
there were 32 boys and 13 girls in a school football team they wanted to play 5 a-side football how many teams can they make?

Physics
I am not about to get Vyellow or Vred by itself to solve

Physics
Two cars collide as shown in the figure. The yellow car is initially heading east and has a mass of 1000 kg. The red truck is initially heading north and has a mass of 2000 kg. The two vehicles collide, stick together, and veer off at a velocity of 16 m/s at a direction of 24 ...

Physics
Thank you so much

Physics
A sprinter accelerates at the start of the race at 8.5 m/s^2. After 1.3 seconds the sprinter runs the rest of the 100m race at a constant velocity. What was the sprinter's time at the finish line?

math
24

In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...

In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...

microbiology
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heter In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent...

geometry
How can I turn 192cubic cm into a triangular prism?

Math
A rock is thrown upward from a bridge that is 88 feet above a road. The rock reaches its maximum height above the road 0.67 seconds after it is thrown and contacts the road 3.18 seconds after it was thrown. Define a quadratic function, f, that gives the height of the rock ...

MaTH
5+r/14 3x-4=23 4

HELP AZAP
-5*x=-35 divide both sides by -5 x=7

Science
ANON IS RIGHT 7/7 100%

History
Does anyone know what impact has gothic architecture had on modern architecture?

Physics
In a glancing collision between two identical steel spheres, which of the following statements are correct? (Assume this collision is perfectly elastic. Select all that apply.) a) The velocities of the spheres after the collision in the direction perpendicular to the incoming ...

Physics
A steel ball rolls off a flat table of height 1.05 m with a velocity of 1.90 m/s a) How long will it take the ball after leaving contact with the table to hit the ground? b) How far from the edge of the table will the ball hit the floor?

History
Need help with study guide!! 1. What are two inventions/concepts that Eli Whitney is known for? 2. Why did New England become the center of the American Industrial Revolution? 3. What was a key element in developing a market economy in nineteenth century America? 4. What was ...

Math
Building A is 190 feet shorter than Building B. The total height of the two buildings is 1520 feet. Find the height of each building.

Math
well you will have 20 dimes and 16 quarters.

Math
Consider the equation f(x)= -2 sqrt(X+3). List in order the transformations applied to the parent function.

Find the restricted values of x for the following rational expression. x^2 + x + 6/8x^2 − 8x

Algebra
y=2-x

Math
Find the restricted values of x for the following rational expression. x^2 + x + 6/8x^2 − 8x

Physics
In a repair shop a truck engine that has mass 429 kg is held in place by four light cables (Figure 1) . Cable A is horizontal, cables B and D are vertical, and cable C makes an angle of 37.1∘ with a vertical wall. Tension in cable A is 729 N . a.What is the tension in ...

school for wildlife conservation
what is the meaning of global warming

Physics
A road heading due east passes over a small hill. You drive a car of mass m at constant speed v over the top of the hill, where the shape of the roadway is well approximated as an arc of a circle with radius R. Sensors have been placed on the road surface there to measure the ...

Math
Four thousand students at a school were asked to name their favorite pizza topping. The results were 800 Pepperoni, 1,000 Sausage, 1,200 Mushrooms, 560 Peppers, 240 Onions, and 200 Other. Your friend expresses these results in this circle graph. Your friend made a mistake, ...

intermediat Algebra
Rachel runs 7 miles in 80 minutes. At the same rate, how many miles would she run in 64 minutes?

math(elmntry euclidean geometry)
The sum of the angles of a quadrilateral is 360°. Find the conditional, draw a diagram, and state the given and conclusion. CONDITIONAL FORM: If it is the sum of the angles of a quadrilateral, then it measures 360°. DIAGRAM: Not shown, but pictures a trapezoid with ...

ALgebra
what is the maximum speed a car could be traveling in order to stop within 40ft? d=0.05V^2+1.20V

Science
Scientific methodology is what distinguishes science from other disciplines. Explain

statistics
a golf ball is selected at random from a golf bag. If the golf bag contains 4 brown balls, 9 yellow balls, and 12 orange balls, find the probability of the following event. probability the ball is brown or yellow?

Math
simplify the expression (4 square root of x)/(6-square root of x) I need help with this. I've worked it out to the point where i got (2 square root of x)/(3-square root of x), but I'm pretty sure that it can be simplified further. If what I'm thinking is right you ...

Math
simplify the expression (4 square root of x)/(6-square root of x) I need help with this. I've worked it out to the point where i got (2 square root of x)/(3-square root of x), but I'm pretty sure that it can be simplified further. If what I'm thinking is right you ...

Chem
a gas has a volumn of 36.0 L and a pressure of 750 torr when the temperature is 10 degrees celsius. what is the pressure if the volume changes to 78 degrees celsius if the amount of gas stays the same?

sensitive probability plz help
Lol what a joke of a teacher

Physic
A bullet of mass 0.05kg has a speed of 400cm|s. What is its kinectic energy? It hits a wall of which the average resistive force is 1000N, Cal.the distance penestrated by the bullet

Maths
Five-eights of the population of a village are men, one-sixth are children and the rest, 500 in number are women. How many children are there?

billing and coding
which of the following will you place below the returned address of a business envolope

Math
A boy throws a ball with a horizontal speed of 2.5 m/s at a height of 0.8 m above the ground. The Coefficient Of Restitution between ball and ground is 80%. • Calculate the x− and y−components of the ball’s velocity, immediately after its first bounce. ...

Algebra
the approximate distance, S, in feet that an object falls in t seconds when dropped from a height can be found by using the formula S=16t^2. How long will the object have fallen in 8 seconds?

Geometry
The Effel Tower in Paris is 328 feet wide at the bottom and 984 feet tall a model of the tower is 12 inches tall What is the width of the model?Round to the nearest tenth

algebra 2
Bonnie and Bruce have a rectangular swimming pool that is 6 feet wide and 10 feet long. They are going to build a tile border of uniform width around the pool. They have a 105 square feet of tile. How wide should the border be?

Physics
A 50kg sign for a local business is hung from a bar which meets a wall at right angles as shown in figure 1. The bar is 1.5 meters long, and it's mass may be neglected. The center of mass of th sign is 1.0 meters from the wall (but .50 meters from the tip of the cable) as ...

UNIBEN Demonstration secondary school, benin city,Nigeria
how to calculate mole fraction

math
In a class of 40 students 18 passed economics 19 passed accounts 16 passed economics 6 passed mathematics only 9 passed accounts only 5 passed mathematics and accounts only 2 passed accounts and economics only. How many failed in all the papers? How many failed in economics? ...

Physics
An automobile and a truck start from rest at the same instant, with the automobile initially at some distance behind the truck. The truck has a constant acceleration of 2.15m/s2 , and the automobile an acceleration of 3.47m/s2 . The automobile overtakes the truck after the ...

Chemistry
1 mol of any gas occupies 22.4L of space at STP. 2L of H2 spread in 22.4L of space =2/22= .089molH2 According to the equation, 1 mol H2 is produced from 1 mol of Zn. .089molH2 * 65.38gZn = 5.8gZn

HESI
27.81

history
She Do Help Us you Idiot She always Helps you are just lazy go back to the text

International Accounting
On December 1, Year1, El Primero Company purchases inventory from a foreign supplier for 40,000 coronas. Payment will be made in 90 days after El Primero has sold this merchandise. Sales are made rather quickly and El Primero pays this entire obligation on February 15, Year 2...

Language Arts
Thank you so much Ms Sue!

Language Arts
Jillian ran around the track as fast as she could Seth waited on the corner for the bus to arrive The house on top of the hill looked abandoned The squirrel sensing danger hid behind a tree

Language Arts
Which of the following sentences contains a prepositional phrase that acts as an adjective?

math

math
I NEED HELP MF

Math
nvm i guessed 120 and got it right

Math
Simplify the expression 6P3. I don't know how to solve it so if you could help me with it as well i would really appreciate it.

AP Chemistry
Determine the volumes of 0.10 M CH3COOH and 0.10 M CH3COONa required to prepare 10.0 mL of buffer of each of the following pH values? a. Ph 3.7 b. pH 5.7 C. pH 5.7 I just need to see how to do one of them and I'll understand how to do the rest.

PE
1 i got ankle sprain 2 i don't really understand it 3 you got it right its a

chemistry
Sulfur dioxide and oxygen gases react at high temperature (400 o C) in the presence of a catalyst(like Pt) to form sulfur trioxide gas. The reaction is started from a gas mixture at 400oC with the partial pressures PSO2 = 15 atm and PO2= 10. atm. What will be the final partial...

chemistry
Hydrogen gas (7.0 mL) is mixed with chlorine gas(4.0 mL) at a certain pressure and temperature. A reaction between H2and Cl2 is initiated by UV light. If pressure and temperature are kept constant, which gases and in which volumes will be found after the reaction is completed?

Physics
I don't know where to even begin... Two equally charged ping pong balls, each having a mass of 5g repel eachother hanging from different strings attached at the same fixed point above. The angle each makes with the vertical is 30 degrees and they are separated by a ...

English
My child is autistic and we try our best.

English
I am helping my child and didn't read much of the book Dragonwings, so can you help me to answer what is moon shadows point of view of the opium dens.

Math
45

PHYsics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r

math
A city park employee collected 600 cents in nickels, dimes and quarters at the bottom of a wishing well. There were 10 nickels and a combined total of 25 dimes and quarters. How many dimes and quarters were at the bottom of the well? I know the answer but need help with what ...

chemistry
The Equation is going to be E = constant + (0.05916)log[X] find constant first use that constant to find the new []

Math
(-24,-15)

physics
A copper atom has 29 electrons revolving around the nucleus. A copper ball has 4x10^23 atoms. What fraction of the electrons be removed to give the ball a charge of +9.6uC?

Pschology 202
well- being

Pschology 202
true

Chemistry
I, II, III

Math
You run 21 miles in 6 days. find the rate.

Math
2/8

Managerial Accounting
Waterways is thinking of mass-producing one of its special-order sprinklers. To do so would increase variable costs for all sprinklers by an average of \$0.70 per unit. The company also estimates that this change could increase the overall number of sprinklers sold by 10%, and ...

Accounting
Waterways is thinking of mass-producing one of its special-order sprinklers. To do so would increase variable costs for all sprinklers by an average of \$0.70 per unit. The company also estimates that this change could increase the overall number of sprinklers sold by 10%, and ...

chemistry
10 l of a solution containing 1.5 moles of HI

Physics
Consider an air-bubble level that is sitting on a horizontal surface. Initially, the air bubble is in the middle of the horizontal glass tube. (a) If the level is pushed and a force is applied to accelerate it, which way would the bubble move? Which way would the bubble move ...

Physics
A 100 kg crate rest at the back of the bed of a pick up truck. The length of the crate is 1 m in the length of the bed is 4 m. There is no friction between the bed of the truck in the crate. If the truck is traveling at 25 m/s just before it hits the wall, how long before the ...

Maths
To solve for the two values of y

scdience
the density of gas was done twice, but with the tablet and 15 cm^3 of water in each case.When the rubber tube was placed as shown , 435 cm^3 of gas was collected. When the tube reached only slightly beyond the mouth of the bottle, only 370 cm^3 of gas was collected. The change...

math
n-1/2