1. Physics

An 80kg construction worker sits down 2.0 meters from the end of a 1450kg steel beam to eat his lunch. The beam is 6.0 m length total. A cable is supporting the beam and is rated at 15,000 N and is at a 30 degree angle to the beam. Should the worker be

2. Math

Jill's front door is 42" wide and 84" tall. She purchased a circular table that is 96 inches in diameter. Will the table fit through the front door? I know the answer is yes but how I don't understand the math???

3. Physics

The human ear canal is approximately 2.3 cm long. It is open to the outside and is closed at the other end by the eardrum. Estimate the frequencies (in the audible range) of the standing waves in the ear canal. Express your answers using two significant

4. Science

The water molecules now in your body were once part of a molecular cloud. Only about onemillionth of the mass of a molecular cloud is in the form of water molecules, and the mass density of such a cloud is roughly 4.0×10−21 {\rm g}/{\rm cm}^{3} Estimate

5. Trigonometry

Having trouble with true/false questions in Trigonometry. They read as follows - True or False: For a trigonometric function, y=f(x), then x=F^-1(y). Explain your answer. True or False: For a one to one function, y=f(x), then x=f^-1(y). Explain your

6. Chemistry

Assume you are performing the calibration step of Experiment 8 and you begin with 40 g of water at 20 oC and 40 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

7. Trigonometry

Having trouble with true/false questions in Trigonometry. They read as follows - True or False: For a trigonometric function, y=f(x), then x=F^-1(y). Explain your answer. True or False: For a one to one function, y=f(x), then x=f^-1(y). Explain your

8. algebra

a sphere has a diameter of 6x cen write an expression to represent the volume of the sphere in terms of pie

9. Chemistry

calculate the freezing and boiling points of each of the following solutions. (a) 0.37 m glucose in ethanol freezing point ______I got -1.2e2 but its wrong_______°C boiling point _________I got 1.1e2 but its wrong:(____°C (b) 15.0 g of decane, C10H22, in

10. Physics

Two blocks, each of mass,m, are attached to the ends of a massless rod which pivots as shown in Fig. 8-40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system. This

11. science

Calculate the molarity of each solution. a) 1.0 mol KCl in 750 mL of solution b) 0.50 mol MgCl2 in 1.5 L of solution

12. statistics

5. Congressional Committee Memberships The composition of the 108th Congress is 51 Republicans, 48 Democrats, and 1 Independent. A committee on aid to higher education is to be formed with 3 Senators to be chosen at random to head the committee. Find the

13. statistics

investigators at an agricultural research facility randomly assigned equal numbers of chicken to be housed in two rooms. In room #1, chickens experienced normal day/night cycles. In the other room, lights were left on 24 hours a day. The objective was to

14. calculus

At noon, ship A starts sailing due east at the rate of 20km/hr. Ath the time, ship B, which is located 100km east of ship A initially, starts sailing on a course 60 degrees north of west at the rate of 10km/hr. How fast is the distance between the two

15. Chemistry

How much sulfuric acid is neede to dissole 200 pounds of nickel powder

16. 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

17. geomtry

A tree casts a 25 foot shadow. At the same time of day, a 6 foot man standing near the tree casts a 9 foot shadow. What is the approximate height of the tree to the nearest foot?

18. Physics

A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 4.8 cm. Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

19. geomtry

A tree casts a 25 foot shadow. At the same time of day, a 6 foot man standing near the tree casts a 9 foot shadow. What is the approximate height of the tree to the nearest foot?

20. Biology

Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does

21. math

from 4 feet above a swimming pool, susan throws a ball upward witha velocity of 32 feet per second. how long does it take the ball to reach the water?

22. Roper

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.1 g of copper and asked to make a wire, using all the metal, with a resistance of 2.0 (ohms). Copper has a density of 8900 kg/m^3. What length will you choose for your

23. Physics

a skydiver is subject to two forces: gravity and air resistance. Falling vertically, she reaches a constant terminal speed at some time after jumping from the plane. Since she is moving at a constant velocity from that time until her chute opens, we

a skydiver is subject to two forces: gravity and air resistance. Falling vertically, she reaches a constant terminal speed at some time after jumping from the plane. Since she is moving at a constant velocity from that time until her chute opens, we

A skydiver is subject to two forces: gravity and air resistance. Falling vertically, she reaches a constant terminal speed at some time after jumping from the plane. Since she is moving at a constant velocity from that time until her chute opens, we

26. AP PHYSICS MECH.

Need help urgent!!! A system consist of a ball of M2 and a uniform rod of M1 and length d. The rod is attached to a horizontal frictionless rotates at an angular speed w, as shown in the figure. The rotational inertia of the rod about point P is ? M1 d^2.

27. Math

A science museum requires 3 adult chaperones for every 15 students on a field trip. How many chaperones would be needed for a group of 125 students?

28. English

I am the WORST writer. English is my weakness. I just wrote this literary analysis. I would go to the writing center at my school, but the paper is due tomorrow and it doesn't open until after my class. I would appreciate it SO much is someone could just

29. physics

A block of mass m = 2.00 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.20 kg which is at rest on a horizontal surface Determine the speeds of the two blocks after the collision. lighter block =

30. math

i want to find the capacity of a tank in litres which has height 30cm, base 16cm, lenght 17cm and has a thickness of 0.5cm

31. trigonometry

+cos 255+sin 165=

32. physics

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. To accomplish this, the mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What

33. social studies

"WITHOUT OUR TWO GREAT POLITICAL PARTIES CUTTING ACROSS ECONOMIC AND GEOGRAPHIC INTEREST, DEMOCRACY AS WE KNOW IT COULD NEVER HAVE BEEN MADE TO FUNCTION" THE AUTHOR OF THIS STATEMENT PROBABLY MEANT TO SUGGEST THAT? A.AN IMPORTANT FEATURE OF THE U.S.

34. chemistry

would you expect lead chloride to dissolve in dilute HNO3? Explain

35. FMU

After 2.02 g of Al has reacted completely with 0.400 L of 2.75 M HCl (the excess reactant), what is the molarity of the remaining HCl? 2Al(s)+6HCl(aq)-->2AlCl3(aq)+3H2(g)

36. math

Determine the sum of the following angles: 13° 31' 27" , 64° 12' 48"

37. Math

A man flies a kite with a 100 foot string. the angle of a string is 52 degrees. how length off the ground is the kite?

38. Dynamics

During a high-speed chase, a 2400-lb sports car traveling at a speed of 100 mi/h just loses contact with the road as it reaches the crest A of a hill. a) Determine the radius of curvature r of the vertical profile of the road at A. b) Using the value of r

39. chemistry

A sample of Nitrogen(N2)& Helium has a volume of 250mL @ 30degrees celsius & a total pressure of 745 mmHg a)If the pressure is 32mmHg what is the partial pressure of the Nitrogen? b) What is the volume of the Nitrogen at STP? Did not understand previous

40. Physics

About how much pressure do the feet of a 6000-kg elephant exert on the ground? Assume each foot has an area of 0.10 square meters.

41. Math Definicions

What does symmets mean?

42. chem101

Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.

43. pre calc

lnX + ln2 = 3

44. Physics

A boy in a car moving at 10 km/h [N] wants to throw a ball to a girl standing on the right-hand side of the road. He is able to throw the ball at 20 km/h. He wants the ball to go straight east, directly to her. a) Relative to the car which way should he

Tonya's car averages 240 miles for each 10 gallons of gasoline. How many gallons of gasoline will the car need travel 216 miles?

46. Physics

A skier (m=61.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 7.70 m and D = 11.4 m, find H. Find her total kinetic energy as she reaches the ground.

47. Chemistry

During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?

48. Math

On a multiple-choice test you randomly guess the answers to two questions. Each question has five choices. What is the probability that you get both answers correct?

49. Science

Acrostic for amplitude

50. chemistry

A sample of Nitrogen(N2)& Helium has a volume of 250mL @ 30degrees celsius & a total pressure of 745 mmHg a)If the pressure is 32mmHg what is the partial pressure of the Nitrogen? b) What is the volume of the Nitrogen at STP?

51. Writing

I need help on fixing my paper. Could you grade me on a scale of 1 to 12. The World of Technology Technology, Technology, that’s all we use today. There’s Facebook, Twitter, Myspace, and so many more. My opinion on technology is that I agree because

52. Chemistry HELP!!

During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?

53. Chemistry

During a strenous workout, an athlete generates 1890.0 kj of heat energy. What mass of water would have to evaporate from the athlete's skin to dissipate this much heat?

54. college chemistry

Calculate the pH of a solution prepared by mixing 150.mL of 0.174 molal aqueous HF (density=1.10g/mL) with 37.5 g of an aqueous solution that is 1.3% NaOH by mass (density=1.02 g/mL)

asked by does anyone get this???
55. Spanish (please correct me if I'm still wrong)

Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish. 12. Maria knew everyone. 13. Because he had already seen the movie, he knew what happened? 14. The student knows the answer.

56. Math

A geologist at point A measures the distance and angle of elevation to two columns of the Glen Rose formation in Texas. If the distance AS=796 ft and the distance AN=850 ft, compute the difference in the heights of the two columns to the nearest foot. What

57. chemistry

A gas has a volume of 5.60 at 0. What final temperature in degrees Celsius is needed to cause the volume of the gas to change to the following, if (number of moles of gas) and are not changed?

58. math

14,950,000,000 convert this number to scientific notation

59. Physics

A rock of mass m and a rock of mass 2m are both released from rest at the same height and fee no air resistance as they fall. Which statements about these rocks are true? (there may be more than one!) EXPLAIN HOW YOU KNOW THEY ARE TRUE AND EXPLAIN WHY THE

60. Math

If a player makes an average of 60% of his free throw attempts, what is the probability he will make both shots of a one-and-one (to have an opportunity to shoot a second free throw he must make the first)?

61. chem

calculate the freezing and boiling points of each of the following solutions. (a) 0.50 m glucose in ethanol for the freezing point i got 58 but it said i have the wrong sign...?

62. science

Calculate the energy required to raise the temperature of 150.0 g Ag from 273 K to 291 K.

63. math

Two cards are chosen from a standard deck of 52 playing cards without replacement. What is the probability both cards will be an Ace

64. algebra

A set of 2 similar triangles was drawn in a design. One of the triangles was ½ of the other. If the measures of the smaller triangle were 5, 7, and 12 cm, the measures of the larger triangle = 10,14 and 20 cm. true or false

65. physics

A 16000 kg sailboat experiences an eastward force of 17700 N due to tide pushing its hull while the wind pushes the sails with a force of 87500 N directed toward the northwest (45 degrees westward of North or 45 degrees northward of West). What is the

106. physics

A sailboat is sailing north on a lake parallel to the shore with a speed of 12 kilometers per hour (km/hr). If a man walking south along the shore has a speed of 4 km/hr, what is the northerly speed of the sailboat relative to the man?

107. calculus

sketch graph of a function f that is differentiable and that satisfies the following

108. classifing shapes

hans back yard is shaped like a square all right angles.Classify the shape in as many ways as posible.

109. physics

Find the approximate gravitational red shift in 500 nm light emitted by a compact star whose mass is that of sun but whose radius is 10 km.

110. Pre Calculus

lnX + ln2 = 3 answer is 10.043 but I don't know how to get to this answer. Thanks for the help!!! :)

111. algebra

Factor the polynomial below. x2 - 10x + 9

112. statistics

A business uses a 7-point scale about satisfaction with the services it provides to clients. The ratings are normally distributed with a mean of 4.8 and a standard deviation of .5. What percentage of clients rate their satisfaction 1) Above 5? 2) Above 6?

113. cross word puzzle

This is for tomorrow and i'm in trouble with this puzzle, please help:ACROSS 9 letters and start with (au)the hint is groups of people who watch or listen to a show, speech, or other performance. Down:It starts off with (aw) and the hint is: a synonym for

114. grammar

Can you help me with my classifying sentences homework?

115. chemistry

is it possible to have an acid/base reaction and produce a precipitate as a product as well?

116. physics

a very thin piece of copper wire has an electrical resistance of 20,000 Ohms. You connect its ends to a regular 2.0 Volt battery. How much power does it draw? Let's assume that this little piece of wire initially contained one trillion (that's a one with

117. CHEMISTRY

An equilibrium mixture contains 2.0cm 3 of 1.00mol dm-3 of h2so4. Calculate the number of moles of H+ in this acid??? ???

118. English - Fools Crow

Hello! Can someone explain to me the following sentence: We're in Class 2. Why do we write C with a capital letter? It is not classroom what is it then?

119. maths

determine if ( 5/6,-2) is a solution to -6x -7y - 9

120. Spanish

Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentence in Spanish. 2. Because he had already seen the movie, he knew what happened? El ya sabía lo que pasaba porque ya vio la película. would

121. Trigonometric Identities

Which of the following are trigonometric identities, I have narrowed it down to two - (cscx + cotx)^2 = 1 OR sin^2(x)sec^2(x) + 1 = cot^2(x)csc^2(x)

122. math

if a triangle with square attached have areas of 6 square units for the smallest square and 10 square units for the largest square, what is the missing area? what are the side lengths for the triangle?

123. math

i want to buy a tv set, but the entertainment center i have is 30 inches by 40 inches, what is the largest tv set i can buy

143. algebra 2

if the length and width of the rectangle are 5 and 11 inches respectivly what is the approimate circufrence of the circle if the rectangle is inscribed inside the circle?

144. science

help with thesis statement of moons gravity and relation to earthquakes

145. history

what was the date that the Spanish conquered the aztecs???

146. Pre-Calculus

Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's

147. chemistry

Would a solution that contains a mixture of NCl and HCl be an effective buffer? Explain

148. math

there are 20pages in jamal book he reads 1/5 of the book how many pages did he read?

149. Math

Solve -7ã(a+b)

150. social studies

americans pay many different types of taxes to federal, state, and local governments. Choose the best example of a tax that we do NOT pay in the U.S.? A.payroll taxes B.value-added taxes C.sales taxes D.income taxes

151. Geography

What caused the fall of the Roman Empire? a. defeat by Greece in the Pyrrhic War b. lack of cultural cohesion c. land region was too large to defend d. peasant rebellion

152. World geography

This period was a time of great political unrest, which divided Europe into eastern and western sections. a. Cold War b. Imperialist c. Middle Ages d. Yalta Conference

153. maths

find in implicit form, the general solution of the differential equation dy/dx = 2(e^x-e^-x)/y^2(e^x+e^-x)^4

169. math

Frank pays his employees weekly. He would like to start paying them four times the weekly amount on a monthly basis. Is a month equivalent to four weeks?

forty-hundreths four-tenths six-tenths sixteen-hundreths

171. How many sig figs?

For this question: what is the boiling point of 0.39 mol ethylene glycol and 0.13 mol KBr in 155 g H2O? I got 102.1470968 and I tried it with 2 and with 3 sig figs but it's both wrong. I know that's the correct answer but I don't know how many sig figs I'm

172. Grade 12 Data Management math

I'm doing math through correspondence so material is not explained very well. I would appreciate if someone could explain this to me. This lesson is review of set theory and first degree equations. Indicate whether each of the following statements is true

173. math

ted put several different integers in order from least to greatest . he then put the same integers in order from greatest to least . both times the same number was third in order . explain how this is possible

174. Physics

The radius of the earth is 6.4 * 10^6 m. What is the acceleration of a meteor when it is 8.4*10^6M FROM THE CENTER OF THE EARTH?

175. algerba

rewrite division as mulitplication -37-(78)

176. Physics

I launch a ball vertically precisely 8' in the air. Then I launch a ball vertically 10' in the air. How much longer will it take the ball to travel 10' versus 8'? Put differently, how much more time does it take the ball to go the 2' further (travelling up

177. algerbra

rewrite division as multiplication and answere as fraction -37-(78)

178. math

what is the value of the 8 in 1,864,973?

179. math

if loar's mom gave her 3/4 of a dollar.joe's mom gave him 4/5 of a dollar. Who got more

180. English

In the novel Push by Sapphire, how does the narration change as the novel progresses?

181. health

choose a tv show that you enjoy and use the chart to emanine how the characters show empathy toward one another.which actions show compassion?which one don't?once you've completed the chart,pick one sence from the episode and determine how the characters

182. CHEMISTRY

An equilibrium mixture contains 2.0cm 3 of 1.00mol dm-3 of h2so4. Calculate the number of moles of H+ in this acid??? ???

183. algebra

a survey of 2000 people was giuven their mode of transportation to work each day, the pie chart below gives the results of people surveyed, how many traveled by bike to work?

184. Physics -- Help!!

If you launch a ball precisely 8' vertically how long does it take to go from the ground to 8' and back to the ground? If you then launch the same ball precisely 10' vertically, how much longer will it take to return to the ground?

185. math

i want to use 30 centimeters of wood to frame a rectangular photo what is the greatest area for the photo could have

186. math

what is the probability of 6,94,85,38,16,42,90,7,44

187. history

what date did the spanish escape from tenochtitlan and then were defeated?

188. Math

I'm doing math through correspondence so material is not explained very well. I would appreciate if someone could explain this to me. This lesson is review of set theory and first degree equations. Indicate whether each of the following statements is true

189. Physics

A 3.9 g bullet leaves the muzzle of a rifle with a speed of 311 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.82 m long barrel of the rifle? I converted 3.9 g to .0039 kg Used the equation t=d/r

238. calculus

Given the differential equations: (sin x)y′′+ xy′+(x − 1/9) y = 0: • Determine all the regular singular points for the Eq.; • Derive the indicial equation corresponding to each regular point; • Determine the form of two linearly independent

239. math

can you divide -35by 5

I have assignment i need help in Agency and partnership, cases how can i send it to you

241. algebra 1-B

solve (sqrt14-x)+8=(sqrt3-x)=11

242. math

what is the next number below 5,13,29,61,125,_?

243. algebra

1) What is 20% of 30? 2) What is 30% of 20? 3) If m and n are any whole number, is m% of n always equal to n% of m? Explain your answer and support it with 2 examples.

244. Geometry

What is the area of a regular hexagon with a side length of 14ft?

245. math

how do you write 24th march 2011 in 5 letters withiut using numbers

246. Math

Find the radius of the given circumference C= 3.14, r=?

247. math

subtract -5-12

248. algebra

6x+7 _____ = X. 5 Find x. Forgot what i'm supposed to do. Could someone explain?

249. CHEM

0.16 M HC2H3O2 and 0.31 M of NAC2H3O2 titrated with what ml of 0.25 M HCL

250. Pre Calculus

sec x = -2 , π ≤ x ≤ 3π Use a calculator to solve for x in the given interval 9)sinθ=0.1473, 0°≤θ≤90° A) -8.47° B) 8.38° C) 98.47° D) 8.47° 10) cosθ=0.7563,0°≤θ≤90° A) 37.10° B) 49.14° C) -49.14° D) 40.86°

251. science

what would happen to day and night if the Earth rotated faster?

252. algebra

if the discriminant of (5u^2)+bu+2=0 is 41, what are all the values of b

253. calculus

calculate the calues of a,b,c if the point p(1,2) is on the curve y=ax^2+bx+c and the tangent line if y=x at the point Q(0,0)

254. math

A certain strain of virus grows in numbers at the rate of 50% per hour. If its present population is 49,000 what will be its population count in 4 hours?

255. Physics

Find the net force of gravity on the moon (Mm = 7.35 x 10^22 kg) from the earth and the sun (Ms = 1.99 x 10^30). Assume that the two forces are perpendicular to each other. Give the angle in relationship to the sun.

256. math

simplify 5/8 over 5

257. math

What are 10 numbers that have a median of 21, a range of 20, and a mode of 10?

258. math

If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 30 centimeters apart, how far apart are the parallel lines?

6x=48 x=

260. chemistry

Heyaa,, I need help to solve this problem!1 Sodium chloride has a giant ionic structure, it has a melting point of 801c. How could you use this information to set up an alarm that sounds when the temperature in a reaction vessel gets above 800c? Thanks x

261. finding perimeters

tell the dimensions and perimeters : 9 square inches

262. algebra

how to solve 2.4-m/q=-1.73 and 3.6-m/q=1.27

263. math

a right trianglehas legsthat measure 1cm and 12cm, what is the measure of the hypotenuse?

264. math

Your body consists of 7/10 water. Is more than 1/2 of your body water?

Hypoventilation VS Bradyapnea What's the difference b/t the two? Aren't they both decreased breathing rate?

266. algebra

factor x^3-5x^2+4x

267. MATH

FIND THE MEDIAN OF THE FOLLOWING PROBLEM. ROUND TO THE NEAREST HUNDREADTH. 8,9,10,12,14,23,23,29,34,37

268. algebra

divide 3z-18z z-6 10 55z

269. algebra

how do I rewrite this 4ã20

270. Math

a patch of dirt needs 3 5/6 ft of sod to cover it. If Nick decides to cover only 3/4 of the dirt, how much sod does he need?

271. math

How can you compare 2 fractions by using a number

272. math

How can you compare 2 fractions by using a number line?

273. Managerial Economics

Are organizations more risk adverse or individuals more risk adverse? Is one more risk tolerant? Use economic theory to explain your position.

274. Litracy

HELP!!! I don't remember how to make a dam sonnet with 10 syllables?

275. Science

Inclination angle of 38.0 degrees with respect to the horizontal. Suppose a truck on a street, for the truck to remain at rest, a static friction must exist. If an additional force with a magnitude equal to one-fourth the weight of the truck is applied

276. English

Why did King want a integrated community instead of blacks forming a separate nation?

which of the following is NOT one of the three steps to take when audience benefits are hard to identify or develop

278. math

how do you fill in the table for y=1/2 (x-8)

279. english

Is the word Redskins a compound word?

280. math

What are some strategies a student might use for finding the sum of 7 + 9 if they did not know the answer?

281. algebra

multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

282. chemistry

Why are both hexokinase and phosphofructokinase-1 strongly inhibited by an ATP analog in which the oxygen atom joining the beta- and y-phosphorus atoms is replaced with a methylene group?

283. Chem

Initially, you have 1.00g of BaCl2 (MM=208.23) and 1.00g of AgNo3 (MM=169.88). How many moles of BaCl2 do you have initially in the mixture?

284. math

In a circle whose radius is 6, find the area of a sector, in terms of pi, whose center angle contains 30 degrees

285. math

how do u find the diameter when they only give u the circumference?

286. math

In a circle whose radius is 6, find the area of a sector, in terms of pi, whose center angle contains 30 degrees

287. chem

Convert (1) from moles of BaCl2 to moles of AgNo3

288. algebra

multiply and simplify by factoring sqrt20a^11b*sqrt8a^12b^11

289. Algebra help

Match the equation 4x^6-2x^3+1=0. With a substitution from the column that could be used to reduced the equation to quadratic form: a) u=x^-1/3 b) u=x^1/3 c) u=x^-2 d) u=x^2 e) u=x^-2/3 f) u=x^3 g) u=x^2/3 h) u= x^4