# Posts by Robert

Total # Posts: 998

**Calculus**

If f(x) and g(x) are differentiable and lim(x->a) f(x)/g(x) exists, does it follow that lim(x->a) f '(x)/g'(x) exists (a converse to l'Hopital's Rule)?

**Mathematic**

. The number of vibrations per second made when a stretched wire is plucked varies directly as the square root of the tension in the wire and inversely as the length. If a 1.23 m long wire will vibrate 325 times each second when the tension is 115 N, determine the number of ...

**math**

f(x)=-8xlnx decreases over what domain

**calculus**

dang it. well the diagram was what my teacher gave me to go by. the 81 is the diagonals on both sides, or that's the way its written on the sheet of paper. and 8 is the length of the base.

**calculus**

a trapezoid is a quadrilateral with (only) two sides (called bases) that are parallel. an isosceles trapezoid has two equal legs. the area of a trapezoid is A=(1/2)*h*(b1+b2) where b1 and b2 are the two parallel bases and h is the altitude. your problem: a water viaduct has a ...

**calculus**

a fence 8 ft tall stands on level ground and runs parallel to a tall building. if the fence is 1 ft from the building, find the length of the shortest ladder that will extend from the ground over the fence to the wall of the building. (hint #1: if L represents the length of ...

**calculus**

a farmer has a 2040 ft of fencing and wishes to fence off two separate fields. one of the fields is to be a rectangle with the length twise as long os the width. while the other field is to be square. determine the dimension of the fields if the farmer wishes to maximize the ...

**phyics**

A novice golfer on the green takes three strokes to sink the ball. The successive dis- placements are 5.9 m to the north, 10 m 45 north of east, and 5.9 m 26 west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a single ...

**algebra**

Re-write with a rational exponent and simplify. ^3 sqrt:22

**algebra**

Find the varition constant and an equation where y varies directly as x=16 where x=8

**math**

find an equation of the tangent line to the curve at the given point: y=sqrt(1+x^3), (2,3)

**Chemistry**

Our class did an expeiment of adding sodium carbonate and calcium chloride. The experiment only yielded 28% of the calculated yield. The class did the experiment as a group (there are only 4 students in our class) and the experiment was closely supervised by our teacher to ...

**Chem**

64----> 32---> 16----->8 1 2 3 There are 3 half life. Divide 42/3 = 14 days

**Algebra**

yo momma

**physics**

A dog with a mass of 15kg jumps forward at 0.50m/s to catch a frisbee coming in the opposite direction at 5m/s. the dog catches the frisbee in its mouth and in doing so its velocity drops to 0.45m/s. What was the mass of the frisbee?

**Math Help**

yes it is, as: w^2-13w+42=0 (w-7)(w-6)=0

**math**

what is 33% of 61

**math**

5 items = a mean of 98 6 items =mean of 102 possible anwers 25,24,117,122 please show how to do

**accounting**

Ayres Services acquired an asset for $80 million in 2011. The asset is depreciated for financial reporting purposes over four years on a straight-line basis (no residual value). For tax purposes the asset's cost is depreciated by MACRS. The enacted tax rate is 40%. Amounts...

**chemistry 1025**

a shoe box measures 12.0 inches by 5.5 inches by 3.5 inches. calculate its volume in cubic centimeters.

**physics**

Carol is correct. I just had this problem on my online test.

**math**

If Jill climbed 100 feet more, how many feet above sea level would she be?

**Math**

10 ways to make .50 only using quarters, nickles and dimes?

**Math**

0.810g/mL-1.375g/mL-2.046g/mL are these numbers precise or accurate or both?

**Math**

3. A processor makes two components, A and B, which are then packaged together as the final product (each product sold contains one A and one B). The processor can do only one component at a time: either it can make As or it can make Bs. There is a setup time when switching ...

**geometry**

4x + 7 = 5x - 4

**Psychology**

compare and contrast the strengths and weaknesses of two different approaches to study the following issue: You have developed a new drug that you believe is effective in reducing appetite. As a result of some preliminary research, you have been given a small grant to design ...

**ALGEBRA**

what does the F and g mean at the beginning of any function

**algebra**

g(x)=10/x+7 what this things domain

**Math**

The formula h=48t-16t^2 gives the height, h, in feet, of an object projected into the air after t seconds. If an object is propelled upward, at what time(s) will it reach a height of 32 feet above the ground?

**Business**

What types of technology do people utilize to communicate? How does technology change the way people communicate? What does technology bring to communication other than the technology itself?

**Business Communication**

The way business communication is conducted [Passive voice] in the workplace experiences regular changes with the advances in technology that makes communication faster and easier.

**calculus**

this is a optimization problem A construction company has been offered a contract for $7.8 million to construct and operate a trucking route for five years to transport ore from a mine site to a smelter. The smelter is located on a major highway, and the mine is 3 km into a ...

**Chemistry**

Ethanol, C2H5OH or C2H6O, is mixed with gasoline and sold as gasohol. Given the following thermo-chemical reaction, calculate the kilograms (kg) of CO2 produced when enough ethanol is combusted to provide (or give off) 369 kJ of heat: C2H5OH (l) + 3 O2 (g) --> 2 CO2 (g) +3 ...

**physics**

Suppose 2 balls of same mass are held by 4 ropes, 2 for each ball. One ball is held by 2 ropes fastened at same height to something and the other at different heights. If the angles made by each respective pair of ropes(eg. right to right) are equal, are tensions in each ...

**Math**

Solve: sin2xsinx - cos2xcosx = 1, x domain [-pi, pi].

**geometry**

Find side c if side a = 10 inches and side b = 6 inches.

**Math**

If Brad invests $2700 in an account paying 11% compounded quarterly. How much is in the account after 6 months?

**math**

1/3x+5(12-x)=2x what would "x" equal? how did you solve it?

**math**

1/3x+5(12-x)=2x

**math**

Why does the inequality sign change when both sides are multiplied or divided by a negative number? Does this happen with equations? Why or why not?

**Statistics**

There is no choices

**Statistics**

Suppose I reported the length f a book shelf to be 2.12 meters. What range would you expect the actual length of the bookshelf to lie in?

**Calculus**

What is the antiderivative of the cube root of (x^2)+2

**Calculus**

What is the antiderivative of the cube root of (x^2)+2

**finance**

Simple interest

**physics hw**

A 300. kg roller coaster car is traveling at a constant speed of 15 m/s over a hill with a radius of curvature of 30. m. b. What is the normal force acting on the car at the top of the hill? c. Assume that the car is at the intersection of the radius and the hill and that a ...

**math**

Amy has $200 less invested at 9% than she does at 6.5%. If the annual return from the two investments is the same, how much is invested at each rate?

**SCIENCE**

DEFINE AND GIVE EXAMPLES 1. Sexual reproduction 2. asexual reproduction

**SQL**

Thank you sir:)

**SQL**

MrMath, please do not post aany answers to this question. My daughter, thinking she would help me with hoemwork posted this. I appreciate your time but do not need any assistance as I have a good understanding of the material. I have asked the site to delete this post. Sorry ...

**SQL**

1- A SQL statement is needed to create a stored procedure that has one input parameter of data type int. The stored proc selects the supplierId field and the total, or sum, of all Count field values for each group of supplierId fields from the Part table. The Part table was ...

**Inorganic Chem**

If you forget to add phenolphthalein solution to a vinegar solution(after adding NaOH solution), how might you salvage the titration?

**Science/Math**

A STONE MEASURED 25KG WAS ACTULLAY 20 KG WHAT WAS THE PERCENT DEVIATION OF THIS MEASURMENT

**SCI207:Dependence of Man on the Environment**

A farmer planted a field of BT 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...

**physics**

A ball is rolling in a straight line at a constant speed. Another ball is motionless. what do they have in common?

**Chem**

1-No 2-No 3-Yes 4-Yes 5-Yes

**chemistry**

a 20.0-L vessel at 700 K initially contains HI (g) at a pressure of 6.20 atm;at equilibrium, it is found that the partial pressure of H2 (g) is .600 atm. What is the partial pressure of HI (g) at equilibrium?

**Physics**

a 2 kg block slides down a frictionless incline from point A to point B. A force(magnitude P=3N) acts on the block between A and B, as shown. Points A and B are 2 m apart. If the kinetic energy of the block at A is 10 J, and the work done by gravity is 20J, what is the KE of ...

**Physics**

A 305 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work done by the ...

**social studies**

social studies

**Health**

This site looks not bad, but I personally not like this blood pressure chart. It hard to understand, and i using mostly bloodpressuremagazine[dot]com to check my blood pressure readings. It nice what all in one place, like normal blood pressure and hypertension.

**Math**

An NFL punter at the 15-yard line kicks a football with an initial velocity of 95 feet per second at an angle of elevation of 28 degrees. Let (t) be the elapsed time since the football is kicked. a. Write the parametric equations of this problem. b. With (t)=0 at the time of ...

**chemistry**

how many grams of manganese (4) oxide are needed to make 5.6 liters of a 2.1 solution

**Physics concept question**

solved it.

**Physics concept question**

A long straight horizontal wire carries a current I = 2.10 A to the left. A positive 1.00 C charge moves to the right at a distance 4.50 m above the wire at constant speed v = 2250 m/s. What are the magnitude and the direction of the magnetic force on the charge? h t tp:// ...

**Physics - Current Loop**

Solved it.

**Physics - Current Loop**

A current loop in a motor has an area of 0.85 cm^2. It carries a 240 mA current in a uniform field of 0.62 T. What is the magnitude of the maximum torque on the current loop?

**Physics- Charge in electromagnetic field**

Solved it. Thanks.

**Physics- Charge in electromagnetic field**

An antiproton (which has the same properties as a proton except that its charge is -e) is moving in the combined electric and magnetic fields of the figure: h tt p://post image. org/image/2sh3s3hs4/ What are the magnitude and direction of the antiproton's acceleration at ...

**Math**

or to be more specific, one half the base times the height. so one half of 16 times 31, or 8 times 31.

**Math**

A= (1/2)(b*h)

**Calculus**

i figured out the f^-1(x) is the ln ((-13x-6)/(17x-5)) i just need a and b plz help before 11 pm

**Calculus**

f(x) = (5e^x-6)/(17e^x+13) find f^-1(x). since the domain of f^-1(x) is in the open interval (a, b) what is a and and b?

**chemistry**

Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation. Cr2O72− + 6 Fe2+ + 14 H+ 2 Cr3+ + 6 Fe3+ + 7 H2O If it takes 44.0 mL of 0.0250 M K2Cr2O7 to titrate 25.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+?

**Algebra**

apples- 55 cents oranges- 75 cents

**statistics**

The results of a medical test show that of 66 people selected at random who were given the test, 3 tested positive and 63 tested negative. Determine the odds in favor of a person selected at random testing positive on the test.

**Life orientation**

Identify 5 practices in contravention of the basic conditions of employment act?

**physics**

the coefficient of restitution between the ball and the floor is 0.60 If the ball is drop from rest at the height of 6.6 m from the floor. Find a) what is the maximum height will the ball attain after the first bounce. b) how much kinetic energy is lost duirng the impact if ...

**physics**

north-eastern

**Physical science**

The acceleration due to gravity on earth

**world history**

some parts of spain remained under muslim control for how many years

**Physics with Calc**

A point charge of 1.8uC (microcoulumbs) is at the center of a Gaussian cube 55 cm on edge. What is the net electric flux through the surface?

**Chemistry**

Need help balancing this equation, just the coeffecients, do not need to balance the charges. The numbers are subscripts: Ca0.41Mg0.36Mn0.50Fe1.76Al2Si3O12 + H + H20 <---> Al(OH)3 + FeOOH + MnO2 + Ca + Mg + Si(OH)4

**geometry**

How to find the area of a KITE when the length of only one diagonal is given, with two pairs of congruent sides but with no length described

**Algebra**

7. Marcus can paint a garage in 3 hours. Gina can paint the same garage in 2 hours. How long will it take Marcus and Gina to paint the garage if they work together

**Algebra**

Thank you so much!!!(:

**Algebra**

How many pounds of apples costing .64 per pound must be added to 30 pounds of apples costing .49 per pound to create a mixture that would cost .58 per pround

**Algebra**

x = adult tkts y = student tkts 3x = value of adult tkts 1.5y = value of student tkts x + y = 105 3x + 1.5y = 250

**Algebra**

x = adult tkts y = student tkts 3x = value of adult tkts 1.5y = value of student tkts x + y = 105 3x + 1.5y = 250

**Algebra**

How do you solve the equations? ):

**Algebra**

Michelle sold tickets for the basketball game. Each adult ticket costs 3$ and each student ticket costs 1.50. There were 105 tickets sold for a total of 250$. How many of each type of ticket were sold?

**3rd grade math**

how do explain how to break apart 3 x 9 to help me multipy

**reading**

Name some symbols for science fiction?

**US History**

It would help him throughout his presidency,because that was his advisors or cabinet members.

**physics**

In hitting a stationary pool ball with the mass of 170 g, a billiards player gives the ball impulse of 6.0 N-s. At what speed will the pool ball move toward the hole?

**Physics**

Thank you!

**Physics**

Can't figure it out. Does it have something to do with finding w? w=2pi/T = square root of k/m but I don't have K or T?

**Physics**

A 1125 kg car carrying four 80 kg people travels over a rough "washboard" dirt road with corrugations 4.0 m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude when its speed is 17 km/h. The car now stops, and the ...

**fractions**

6/10 is how long he taught 8th grade so 10 - 6 = 4 is how long he taught something else. The new fraction would be 4/10 but if you simplify it, 2 being the common factor in both you would get 2/5 4 = 2 * 2 10 = 2 * 5