# Posts by jacob

Total # Posts: 927

**Physics**

On a very muddy football field, a 100 kg linebacker tackles an 75 kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.5 m/s north and the halfback is sliding with a velocity of 7.5 m/s east. What is the magnitude of the velocity at ...

**math**

Paulo earns a salary of 15000$ per month for selling cell phones. He receives an extra 30$ for each cell phone over 100 units that he sells. How much will be make if he sells R cell phones? 50 cell phones?

**Math**

Symbol for A

**Math**

Choose the symbol that completes the statement. 7/8. 8/10* A < B > C =

**Physics**

A bicycle is racing around on a horizontal surface in a circle of radius 27 m. The force exerted by the road on the bicycle makes an angle of 16 degrees with the vertical. What is its speed?

**Language arts**

My Answer B.

**Language arts**

The word expectations best describes which situation from “Two Kinds”? Waverly’s reputation as a chess champion the mother’s hopes for her daughter to become a prodigy Mr. Chong’s retirement from teaching piano the daughter’s performance at the ...

**math**

Sarah is 5 years younger than 9 times Mario's age

**Physics**

A red ball is thrown directly upwards from the ground with an initial velocity of 35.0 m/s. At the same time, a blue ball is thrown directly upwards from he ground with an initial velocity of 10.0 m/s. 1. How high is the red ball when the blue ball reaches its highest point? 2...

**Maths**

Six numbers are written in ascending order: 1.4, 3, 4.7, 5.8, a, 11. Find all possible values of a if the number 11 is considered to be an outlier. The answers say 5.8 is less than or equal to a<6.2 but i am struggling to figure this out

**Maths**

Find the interquartile range for a set of data if 75% of the data are above 2.6 and 25% of the data are above 3.7.

**Mathematics question**

In my town some of the animals are really strange. Ten percent of the dogs think that they are cats and ten percent of the cats think they are dogs. All the other cats and dogs are perfectly normal. One day I tested all the cats and dogs in the town and found that 20% of them ...

**Maths**

In addition to spanning a river which is 50 metres wide, a straight bridge also has considerable overlap of both banks of the river. One third of the bridge overlaps one bank and one half overlaps the other bank. The total length,in metres, of this bridge is A. 100 B.150 C.200...

**Washington state history**

please help What about Washington’s post-World War II economy does the image represent? A.a change in focus to large businesses, science, and technology B.a change in focus to large businesses, science, and technology C.a decline in building and city growth D.a shift from...

**College Chemistry**

No Thank you very much.

**College Chemistry **

You have combined 1.218 moles of calcium ions and 0.943 moles of lithium ions in enough solvent to make 500.00mL of solution. What is the mole fraction of lithium ions in this solution? What type of problem is this and how do I set it up to solve?

**maths**

A 60m long bridge has an opening in the middle and both sides open up to let boats pass underneath. The two parts of the bridge floor rise up to a height of 18 m. Through what angle do they move?

**Algebra 2**

Use the values of a_1( 1 is below the a) and s_n (n is below also) to find the value of a_23. A_1=10, s_23=2760, find the value of a_23 Please help, I really need help. Thanks.

**spanish**

rewrite each statement two ways using object pronouns : Tenemos que recordar la informacion.

**Physics**

A diver springs upward with an initial speed of 2.93 m/s from a 3.0-m board. (a) Find the velocity with which he strikes the water. [Hint: When the diver reaches the water, his displacement is y = -3.0 m (measured from the board), assuming that the downward direction is chosen...

**math**

yes! thank you much

**math**

seven times the sum of a number and seven is 13 more than the number. what is the number? i know it cant be that hard but please help

**Math**

A box weighing 700 pounds is on a ramp inclined at 15 degrees with the horizontal. Find the force necessary to prevent the box from sliding down the ramp.

**Math**

A diagonal of a parallelogram is 10 inches long and makes angles of 25 degrees and 43 degrees with the side. how long is the longest side?

**word problem**

Thank you

**word problem**

Ashton and molly start out 97.2 miles apart .They begin riding their bicycles toward each other with Aston riding three mph faster than Molly. If they meet in three hours, how fast was each person riding? Please help

**English**

Help Me!! ____no centeral goverment at the time, there would have been no peace inth land. a)There had been b)Should there be c)Had there been Wich will be correct answer?

**Calculus**

Prove that the function defined by: f(x)={1 if x is rational, 0 if x is irrational is not integrable on [0,1]. Show that no matter how small the norm of the partition, ||P||, the Riemann sum can be made to have value either 0 or 1.

**chemistry**

Use the table of complex ion formation constants to calculate the molar concentration of free Fe^2+ in 0.510M aqueous solution of potassium hexacyanoferrate(II) K4(Fe(CN)6) at 25 degrees celsius. I know the answer is 1.96*10^-6 m, but I'm at a loss on how to get there. I&#...

**Chemistry**

Urea, which has the chemical formula (NH2)2CO, is a fertilizer that can be prepared by reacting ammonia (NH3) with carbon dioxide (CO2). Given the following chemical equation, what is the theoretical yield of urea (in grams) if 4.16 mol ammonia is the limiting reactant? 2 NH3(...

**Science**

What is the identity of the precipitate that forms when 70 mL of 0.3 M BaCl2 reacts with 65 mL of 0.35 M Na2CO3

**Social Studies**

Your answer is wrong, check it again

**Physics**

State the similarities between Coloumb's law And Newton's Law Of Universal Gravitation.

**Chemistry**

Fireflies flash at a rate that depends on the temperature. At 29oC, the average rate is 3.3 flashes every 10 seconds, whereas at 23oC, the average falls to 2.7 flashes every 10 seconds. Calculate the "energy of activation" (in kJ/mol) for the flashing process.

**Physics**

A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

**Math**

Order the following from least to greatest 0.3 3/5 0.66 2/3 0.35

**algebra**

Die

**Linear Algebra**

(a) Use the triangle inequality: ||u + v|| <= ||u|| + ||v|| to prove that (i) ||u - v|| <= ||u|| + ||v|| (ii) ||u|| - ||v|| <= ||u - v|| (b) If ||u|| = 5 and ||v|| = 3, what are the smallest and largest possible values of ||u - v|| and ||v - u||?

**Linear Algebra**

Find the matrix of the following transformations: (a) Multiplication of the point (x, y, z) in ?^3 to give the point (x - y, y + 2z, x + z) (b) Reflection of points in ?^2 across the line in y = x.

**Math**

-1/2x-3greater than 8

**algebra**

Jane has $4.50 in pennies, nickels and dimes. She has twice as many pennies as she has nickels and dimes combined. How many of each coin does she have?

**english3**

Even a young actor can appear old through the ___ of stage makeup.

**english**

Pinocchio's lies cause his nose to grow, but when he ___ it returns to its usual size.

**math**

A bag contains 45 marbles of various colors. Jon draws 60 times, each time replacing the marble before drawing again. He gets a total of 12 blue marbles. Which is best prediction of how many blue marbles are in the bag?

**Math**

The table shows the results of a spinner with four colored sections. Use the table to answer the question. The spinner is spun 50 more times. Which is the best prediction for the number of times the spinner will stop on blue?

**math**

Brahim completed 18 free throws and missed 12. Using experimental probability, how many free throws is he predicted to complete in the next 100 tries?

** calculus **

Find the values for the following functions. If f(x)=2^x, show that f(x+3) -f (x-1)=15/2f(x) If G(x)= sin 2x, find G(0),G(1/4 pie),and G(7/8 pie)

**calculus**

Find the domain of the variable x for which the following equations determine y as a real function of x. If G(x)= sin 2x, find G(0),G(1/4 pie),and G(7/8 pie) can someone help me please!

**Math Help ;)**

Oh ok. I get it now. Thank you so much Ms.Sue. Have a wonderful day!

**Math Help ;)**

So, I've been stuck in these for quite some time.... can someone help me? Which ratios can form a proportion? A) 9/45 , 8/40 B) 8/12 , 12/21 C) 8/12 , 12/15 D) 9/22 , 14/28 I think it might be C but my brain is fried. Thank you so much, Jacob

**Physics**

A football is kicked at ground level with a speed of 17.7 m/s at an angle of 39.8 ? to the horizontal. How much later does it hit the ground? Answer=> t=_____ s Express your answer using three significant figures and include the appropriate units.

**Chemistry**

A 50.0 mL aqueous solution of sodium hydroxide has a pH of 12.50. If 36.00 ml of 0.0200 mol/L sulfuric acid is added to this sodium hydroxide solution, what will be the new pH of the resulting solution? Assume that the temperature stays constant at 25 C, and that the volumes ...

**Pre Algebra**

Thanks!

**Pre Algebra**

No so the answer would be -2. If so i get what I did wrong. For some reason I always make simple mistakes.

**Pre Algebra**

No -1 would be the answer

**Pre Algebra**

So the answer would be -64

**Pre Algebra**

I meant -8 instead of -5

**Pre Algebra**

N*-5 / -4=4 N*-5 = 8 N= -40

**Pre Algebra**

Please help this is really ergent.

**Pre Algebra**

A number is divided by -4, then multiplied by -5. The result is 40. What is the number? I had problem finding a formula for it. And this one was also like it. A number is multiplied by -8, then divided by -4. The result is 4. What is the number?

**Check my awns-The true cost of fossil fuels - Quiz**

Ahh

**Check my awns-The true cost of fossil fuels - Quiz**

When you say last one is wrong do you mean the one I commented ? Or the last one

**Check my awns-The true cost of fossil fuels - Quiz**

Thanks

**Check my awns-The true cost of fossil fuels - Quiz**

Which of the following is one benefit of recycling It increases the volume of solid waste. If it is recycled, and materials will not be biodegradable. It conserves resources and energy. It uses more raw materials that need to be mined. **?

**Check my awns-The true cost of fossil fuels - Quiz**

_________ is a solid fossil fuel that forms from plant remains. Coal ** Hydrocarbon Natural Gas Petroleum Air pollution can be controlled by Permitting more storm runoff. Burning more coal. Eliminating Sewage Putting scrubbers on power ** Formed how are fossil fuels? They are ...

**math**

Tommy walked 3 2/7 miles. write the distance Tommy walked as an improper fraction. A.4 B.4/3 <<my answer<< C.5/2 D.23/7 please tell me if B is right.

**Check My Answer Please**

Why were women fighting for suffrage? A:because they wanted to end abuse toward women B:because they wanted to win the right to vote**** C:because they wanted to gain the right to work D:because they wanted to end women's inequality Completely doing an educated guess right...

**math**

r is no less than 1 unit from 24

**PreCalc**

Suppose that $14,000 is invested in a savings account paying 5.2% interest per year. (a) Write the formula for the amount A in the account after t years if interest is compounded monthly.

**math**

Tony bought some stock for $504. If each share had cost $4 less he could have bought 3 more shares for the same $504. How many shares of stock did he buy

**algebra**

The diagonal and the longer side of a rectangular plot are together three times the length of the shorter side. If the longer side exceeds the shorter side by 140 ?feet, what is the area of the? plot?

**algebra**

Find the equation for the graph of the path of a point? P(x,y) that moves such that? P(x,y) is the same distance from the point ?(14?,0) and the? y-axis.

**Algebra**

Divide by long division (4x^3 - 2x^2 - 8x+3)/(x^2 +5) Please help I can't figure this out.

**Technology**

You smell like your ugly mama

**maths**

Using trigonometric ratios find the remaining side lengths and angle measurements to 2 decimal places each: (a) ? = 35°, ? = 90°, a = 30 (b) ? = 90°, b = 7, c = 6 (c) a = 33, b = 56, c = 65

**TASTY MATH!**

Why won't the cookies taste the same though...? I'm so confused. I've been doing this stupid test for hours

**Math**

Why do you have to use estimation to find the number of triangles you need for the string? I was wondering why this question is quite confusing and i was wondering if you can explain it to me in a way i can understand it. I'm not looking for an answer just a more simpler ...

**Chemistry**

0.5g of MG ribbon is reacted with 100ml of 1M HCL. The initial temperature of HCL is 20.4 degrees celsius. After the reaction the highest recorded temperature is 40.7 degrees celsius. Calculate the molar enthalpy of MG. I tried to find mol from HCl and then use nH=mcdeltat. ...

**Algebra**

I mean this is great, but I want to know how to do it.

**math**

A=50 S=62

**Science**

Fuel can burn in the furnace.

**science**

no B

**science**

1. What is the main difference between mechanical and electromagnetic waves A. Mechanical waves involve transfer of energy; electromagnetic waves do not. B. Mechanical waves require a medium to travel in; electromagnetic waves do not. C. Mechanical waves have amplitude and ...

**MATHS**

The square of a number is 3 more than half the number.find the possible values of the number.

**English**

Yes kickass is right! 20/20

**Algebra**

Solve the system by elimination. X+y=4 X-y=-2 I can't figure this out please help

**Algebra**

Yes I got it now. Thanks so much for the help.

**Algebra**

The surface of the Grand Lake is at an elevation of 648 feet. During the current drought, the water level is dropping at a rate of 3 inches per day. If this trend continues, write an equation that gives the elevation in feet of the surface of Grand Lake after x days. I am ...

**Math**

If the perimeter of a rectangle is 70 feet what is the height to length of a ratio of 4:5

**Maths**

kys

**Math**

A car leaves town traveling at 35 MPH. A 2nd Car leaves Town 2 hours later traveling in the same direction. In how many hours will the 2nd car be passing the first.

**Math**

A car leaves town traveling 35 MPH. Two hours later a 2nd car leaves, in the same direction traveling 55 MPH.In how many hours will the 2nd car be passing the first?

**Math**

A farmer had sheep and end.altogether 124 legs, how many sheep and hens

**physics**

A vertical container with base area measuring 12.3 cm by 13.7 cm is being filled with identical pieces of candy, each with a volume of 50.0 mm^3 and a mass of 0.0200 g. Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies ...

**Thermodynamics physics**

A lead bullet moving at 204 m/s is stopped in a block of wood. All of the kinetic energy goes into heating the bullet. The initial temperature of the bullet is 25 degrees C. What is the final temperature of the bullet in degrees C

**leadership development**

1.Even though Mike is a great basketball player, he tries with just half effort on drills during practice. This is an example of A wasting talent B getting distracted C allowing others to set goals 2.Jim would like to get a summer internship, but his dad thinks he should work ...

**math plz help my last chance to do this homework**

I need to write the simplified expression for a rectangle's perimeter that is wide x-5 and the high is -5x.

**la language arts**

Joe magarac, Man of steel 8. In section 1, what does the author mean when he says joe magarac is a folk hero? A. Joe was a real man who spent his whole life in the steel mills of Pittsburgh. B. Joe was a mysterious figure who vanished without a trace.* C. Joe was a legend ...

**Chemistry**

Which of the following statements is true? All spontaneous processes are exothermic All non-spontaneous processes are exothermic All spontaneous processes release free energy*** Entropy always increases in a spontaneous process

**Chemistry**

The rate of a chemical reaction normally decreases as temperature increases is slowed down by a catalyst increases as reactant concentration increases*** decreases as reactant concentration increases