# Posts by Frank

Total # Posts: 515

**math**

a lorry tank was 3/5 full of petrol , 21 liters was added and it is now 5/6 full. how many liters of petrol can the tank hold

**Math **

Three circles which touch each other externally with the center of the circles at A, B, C form a triangle with size of 9cm, 7cm, 6cm.calculate the radii of the circle

**AP Chem**

do I have to find Ksp using the .5M?

**AP Chem**

Write the overall net-ionic reaction that occurs when iron (ii) hydroxide (Fe(OH)2, Ksp = 7.9 x 10^-15) is dissolved in a 0.500 M sodium cyanide solution forming a complex ion. (Fe(CN)6^4-, Kf = 7.7 x 10^36) Determine the value of the equilibrium constant for the overall net-...

**social studies**

Which of these events during the Age of Exploration was a cause of the other three? A) warfare increased as European nations competed for land and power B) advances in learning and technology made long ocean voyages possible C) Europeans brought food, animals, and ideas from ...

**riddle**

New moon

**math**

How long will it take an 8% simple interest rate for $850 to amount to $1000?

**Math (Geometry)**

That is the question. We have to write that into a linear equation

**Math (Geometry)**

Linerar Equations Hourly rate of $8.00 an hour for a guaranteed 40 hours

**Chemistry**

Hi, wondering if anyone can help with the following problem: A solution of NH3 (kb=1.8x10^-5) has a ph of 11. what is the molar concentration of NAOH? I am unsure how to go about this however i have tried [10^-3][10^-11]/ 1.8x10^-5 with no success. Thanks for your help

**algebra**

The sum of three numbers is 82. One of the numbers is 9 more than one of the others. Represent the numbers in terms of one variable.

**math**

A chemist test involves measuring two independent quantities A and B, the expressing the results of the test as C such that C= 3A-0.5B. Give that A is normally distributed with mean 10 and standard deviation of 1, and B is also normally distributed with mean 34 and standard ...

**Maximal area and dimensions of a window**

Unfortunately it is not that easy. I tried. :D If you have a chance to look at the picture you will understand. :) Just replace the "(DOT)" in the link with actual dots ".".

**Maximal area and dimensions of a window**

Hey Jiskha, came across this problem in my maths homework and I can't seem to solve it. Can someone maybe help me out? A Norman window has the shape of a rectangle with a semi circle on top; diameter of the semicircle exactly matches the width of the rectangle. Find the ...

**math**

My Progress so far: P=4x+3y=2100 A=2xy A=2x(2100-4x/3) This way I was able to calculate x= 525/2 or 262.5 But I'm having a struggle rewriting the formula used in terms of y. Can somebody help?

**math**

Hi guys, I am really stuck with this problem, maybe somebody could help me out. A rancher has 2100 feet of fencing with which to construct adjacent, equally sized rectangular pens as shown in the figure above. What dimensions should these pens have to maximize the enclosed ...

**Finite math**

A bank account pays interest at 12% compounded monthly, and has a monthly fee of $10, deducted at the end of each month. If $13,000 is deposited on January 1, 2013, how much is in the account on January 1, 2016? I have done some question related to compound interest however ...

**Physics**

The density of copper is 9.8×10^3 and the density of gold is1.9×10^4. When the two wires of these two metals are held under the same tension the speed in the gold wire is found to be half of that of the copper. What is the ratio of the diameters of the two wires?

**C++**

// Program: name of program // Author: your name // Date Written: date you began writing the program /* Abstract: Brief description of the program */ Include in-line comments in the body of your program. You can convert temperature from degrees Celsius to degrees Fahrenheit by...

**Math**

Steve before you start asking why may I tell you that you completely did not understand the question this is the cross product between two vectors. x is not a variable it is a symbol of operation. So try again, you cannot just distribute.

**Math**

This is a cross product problem: Given uxv=<2,-3,0> find (u-5v)x(u+4v) I appreciate your help Thank you!

**Math**

is 3 A and is 4 the first and 3rd one and is 1 d

**Math**

1. what is the solution of 87 + (-396)? A 183** B -183 C 9 D -9 2. Evaluate: -12 x 3 =? A 36 B -36** C 4 D -4 3. Evaluate: -20 ÷ -10 =? A 200 B -200 C 2 D -2*** 4. Select all the problems that have a solution that is negative. -8 + 10 = ? 8 x (-2) +? -4 ÷ (-2...

**Physics 11**

A mass of 10 kg, initially at rest on a horizontal frictionless surface, is acted upon by a horizontal force of 25 N. The speed of the mass after it has moved 5.0 m is: . a) 5.0 m/s
. b) 10 m/s
. c) 15m/s
. d) 125 m/s
. e...

**Econ**

Please help me and review my answers for my quiz. Let me know which ones you believe to be right and wrong. 1. When P = AR = MR = AC = MC: X economic profits are positive. economic profits are zero. economic profits are negative. normal profits are zero. normal profits are ...

**Economics**

The Southern Tree Trimming Corporation reported an accounting profit of $35,000 and a normal rate of return of 15 percent on capital and enterprise of $30,000. The opportunity cost of labor is $15,500. What is the economic profit? $110,500 X $19,500 $15,000 $5,000

**physics**

i need an answer urgently!please

**physics**

A spinal spring,loaded with a piece of metal,extends by 10.5cm in air.When the metal is fully submerged in water,the spring extends by 6.8cm.Calculate the relative density of the metal using Hooke's law

**Physics**

i don't know the answer guys..please help me out

**Math**

(4x^2 - 2x-1) - (-3x^3 + 2)

**Math**

Many has two boxes one contains 10 colored pencils 4 of witch are red and 6 which are green the other box onther box contains 7 markers and which 4 are red and 3 are blue what's the probability of of many choosing green green pencil and red marker

**statistics**

0.29

**Biomechanics/Physics**

A 125 pound female is late for her biomechanics final and after arriving dashes up 40 steps each 15cm high in 1.65 seconds to take a seat and start the test. Hint: 1 lb = 4.47N How much work did she perform running up the steps?

**Government**

What are the three methods special interests groups might use to win favorable votes form legislators ?

**life orientation**

Six ways that the human rights violation influences individuals group and the broader south Africa community

**math**

Let a be -1/6 and let b be 1/2. Let x be the sum of the reciprocals of a and b, let y be the product of the reciprocals of a and b, and let z be twice the reciprocal of a divided by the reciprocal of b. Calculate x+y+z.

**math**

the answer is simply 23.

**math**

I took a test today that had 50 questions I needed 70 percent to pass I missed 10 questions what is my percent?

**History**

what was the Rhode Island connection with the cotton gin?

**Pre-Calculus**

An investor has $100,000 to invest in three types of bonds: short-term, intermediate-term, and long-term.How much should she invest in each type to satisfy the given conditions? Short-term bonds pay 4% annually, intermediate-term bonds pay 5%, and long-term bonds pay 6%. The ...

**Can you check an answer for me?**

Awesome, thanks Steve!

**Can you check an answer for me?**

There is a jar with 16 marbles. 4 are red, 7 are blue, and 5 are green. You select two marble at random. One marble is drawn and not replaced. Then a second marble is drawn. What is the probability of selecting a red marble and then another red marble? a. 3/64 b. 1/4 c. 1/20 d...

**Please help me on math, thanks!**

If no digit may be used more than once, how many 2-digit numbers can be formed using only the digits 5, 6, 3, and 2? 11 12 10 2

**History**

GOT IT, ITS c

**History**

C!

**History**

huh?

**History**

D?

**History**

3.)Which of the following are possible results of the Monroe Doctrine? A.)Native Americans are forced off their lands in the West. B.)More Americans move westward seeking gold and riches. C.)The U.S. stops a Spanish ship from entering Florida waters. D.)European countries have...

**Physics**

An airplane has a velocity of 580 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 92 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth (answer...

**Math**

My math problem says seven tenths exceeds seven thousandths by what number. Do I subtract like this: 0.007 - 0.7

**MATH**

In a drawer Richard has 5 pairs of gloves. Each pair has a different color. On Day 1 Richard selects two individual gloves at random from the 10 gloves in the drawer. On Day 2 Richard selects 2 of the remaining 8 gloves at random and on Day 3 two of the remaining 6 gloves at ...

**Theory of interest**

An annuity last for 12 calendar years.At the end of each quarter,there is a payment.First quarter payment are $200,second quarter payments are $300,third quarter payments are $150 and fourth quarter payments are $400.Find the accumulated value of this annuity just after the ...

**Theory of interest**

An annuit last for 12 calendar years.Atthe end of each quarter,there isa payment.First quarter paynments are $200,second quarter payments are $300,third quarter payments are $150 and fourth quarter payments ate $400.Find the accumulated value of this annuity just after the ...

**Theory of interest**

An annuity last for 12 calendar years.At the end of each quarter,there is a payment.First quarter payments are $200,second quarter payments are $300,third quarter payments are$150 and fourth quarter payments are $400.Find the accumulated value of this annuity just after the ...

**chemistry**

a solution is known to contain Cl, NO3, NO2, and SO4 ions. which of these ions can be positively identified?

**chemistry**

why wouldn't HCl be a good acid to use to determine the solubility of a silver precipitate in acid soulution?

**Maths**

In an exam a student scored 60 marks out of a possible 80. What percentage is this

**Principles of Finance**

Warmack Machine Shop is considering a four-year project to improve its production efficiency. Buying a new machine press for $490,000 is estimated to result in $200,000 in annual pretax cost savings. The press falls in the MACRS five-year class, and it will have a salvage ...

**Principles of Finance**

Romo Enterprises needs someone to supply it with 121,000 cartons of machine screws per year to support its manufacturing needs over the next five years, and you’ve decided to bid on the contract. It will cost you $880,000 to install the equipment necessary to start ...

**Principles of Finance**

A five-year project has an initial fixed asset investment of $335,000, an initial NWC investment of $35,000, and an annual OCF of −$34,000. The fixed asset is fully depreciated over the life of the project and has no salvage value. If the required return is 10 percent, ...

**Chemistry**

How many nanoliters of a 1.00 molar solution would be required to react with 5.00 grams of barium nitrate?

**sciencec**

D. 3' TGCGTACCGTTTTTTTT 5'

**Chemistry**

same answers confirmed by instructor

**Algebra 2**

Did I perform this operation correctly? (a^2-b^2)/(a^2-2*a*b+b^2) /(2*a^2+5*a*b+3*b^2)/(2*a+3*b) = 1/a-b

**Physics**

What effect does the normal force have on the coefficients of friction?

**Physics**

A storage battery has an emf of 6.3 volts and an internal resistance of 0.01 ohm. it is to be charged for 120 amperes.hours from a 30 volt emf source having a resistance of 0.08 ohm at the rate of 20 amperes. a. compute for the resistance needed b. what is the cost of ...

**chemistry**

Le Chatelier's principle lab

**chemistry**

What assumption did you make about the reaction of KMnO4 solution in those determinations where temp didn't change to allow k to be a constant?

**Ebhs,maths,siswati,english and business studies**

I am frank,i have 4 credits with me namely,maths,siswati,business studies and english,am asking what courses i can take

**Life orientation**

Can you please help with this question which says'descrie a recent service delivery protest in your community or in the neibourhood.what are the problem that the community faced?.under the following topic:campaign with responsibility

**math**

At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50. 1.A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? 2.50/1 2. Assuming the price of clothing increased ...

**chemistry**

A particular brand of toothpaste claims to contain 0.24 wt% sodium fluoride. What mass in grams of fluoride ion would be present in the average amount of toothpaste used to brush one's teeth, about two grams? Now this is a weight percent concentration question, I know that...

**chemistry**

As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these ...

**Calc**

A stone is thrown straight up from the edge of a roof, 625 feet above the ground, at a speed of 20 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later?

**PE**

I got 8/12

**math**

write an addition equation the equation must have a 1 a 2 a 3 digit added and use all of these digits 662-228-8000

**math/physics**

A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp, frequency and steady ...

**Math i need someone awesome to help! ASAP**

which measure correctly completes the statement 627 L = ? mL

**Geometry**

Write the equation of a circle given the following: Diameter measures 15 units and the center is at the intersection of y =x + 7 and y= 2x-5

**quadratic formula**

okay thank you

**quadratic formula**

My chemistry professor wants us to use the quadratic formula

**quadratic formula**

2x^2=-8x+10 I got x=-2-1i x=-2+1i But every time I plug the numbers back into the equation I am not getting the sides to equal. Not sure how to use the imaginary i.

**solution making/ chemistry/biotech**

I thought it did but that's all the question gives you

**solution making/ chemistry/biotech**

You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 37.5 by dividing 750/20 but I am not sure

**Solution Making**

Suppose you start with a 5X solution A, and you want a final volume of 10ul of 1X solution. How much Solution A do you need? Can you please check my work not sure. I need 2 ul of solution A to 8 ul of H2O. 5/1=.2*10=2

**solution making/ chemistry/biotech**

thank

**COMM/215**

I would like to know if i have used the correct grammar and punctuation in the following two sentences: 47. "Have you ever read the story, 'The Tell-Tale Heart' by Edgar Allen Poe?" Dave asked. 48. "Did the professor say, 'Put down your pencils'...

**COMM/215**

I would like to know if i have used properly structured sentences for the following: 49. To succeed in the new economy, workers will have to learn throughout their careers adapt to changing circumstances, and self-motivate when needed. 50. Some students hate math; some ...

**AP Calc**

find f(x), if f'(x)=2x-3 and the graph of y=f(x) contains the point (2,5).

**algebra**

the lenght of a rectangular is 50 feet more than the width,it the perimeter of the basketball court is 300 feet,what is the lenght of the field

**Intro to computers**

You have set up Remote Desktop for the company server running Server 2008 so that your users can RDP in from their XP workstations. Users are calling you saying that they are being denied the ability to remote in. What is the most likely reason? A. XP does not support Remote ...

**Physics**

An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.

**Physics**

857.5hz?

**Physics**

What is the frequency of a sound wave in air at 20°C that has a wavelength of 0.4 m?

**Physics**

Thanks!!

**Physics**

A cubical object of sides 5 cm is immersed completely in water. What is the force of buoyancy on the object? (Assume g = 10 m/s2)

**physics**

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?

**Physics**

Does P=V^2/R seem correct?