# Find a(subscript 6) of an arithmetic sequ3nce if a(subscript 4)=5 and a(subscript 9)=20. The value of an increases 15/5 = 3 per term. Therefore a4 = 5 a5 = 8 a6 = 11 a7 = 14 a8 = 17 19

94,873 results
1. ## physics

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +13.0 m/s^2. At t(subscript 1), the rocket engine is shut down and the sled moves with a constant velocity v until t(subscript 2). The total distance traveled

suppose that a1, a2, a3, ..., ak forms an arithmetic sequence. If a5+a8+a11=10, a7+a10+a13=12, and ak=11, find k note: the numbers and the k after the a's are subscript but i don't know how to type that

3. ## Chemistry

An element with the symbol Z has the electron configuration 2.8.6. Which species is this elrment most likely to form? A. The ion Z 2+ B. The ion Z 6+ C. The compound H subscript 2 Z D. The compound Z subscript 6 F Which ionization requires the most energy?

4. ## Chemistry

Balancing Equations for Reactions Occurring in Basic Solutions: I have the answer for it and I've gone and redone it twice and I can't match the answer...I was just seeing if anyone could show the steps so that I could see where I messed up...

5. ## Chemistry

A 1.85-g sample of a mixture of KCl and MgCl(subscript 2) is treated with excess AgNO(subscript 3) (aq). If 3.82 grams of AgCl(s) are obtained, then what is the percentage by mass of KCl in the original mixture. Can someone tell me what the balanced

6. ## math

Find the vector projection of u onto v. Then write u as the sum of two orthogonal​ vectors, one of which is proj (Subscript v)u.

7. ## math

given log_b a = c, which statement is true? (the b is subscript) a. a = b^c b. c = a^b c. c = b^a d. a = c^b

8. ## physics

for an object sliding down an uneven incline, which of the following represents the change in height necessary for the velocity to double in terms of its initial velocity V? a)2V 2(subscript)*g b)3V/g2(subscript) c)3V 2(subscript)/2g d)3V/2g e)2g/3v

9. ## Chem Need Help

I really need help with this question? You have a 12.01 g sample of carbon. The average mass of a carbon atoms is 1.994 x 1023 g. How many carbon atoms are in the sample? (round the number to 2 decimal places) (if you get a superscript, place a ^ before

10. ## Chemistry

Hey, can someone help me with this? A compound containing only C, H and O was subjected to combustion analysis. A sample of 6.120Ã—10^-2 g produced 1.601Ã—10^-1 g of CO2 and 5.243Ã—10^-2 g of H2O. Determine the empirical formula of the compound

11. ## HELP!! Chemistry

Draw a Lewis structure for SO(subscript 2) in which all atoms obey the octet rule. Show formal charges. Draw a Lewis structure for SO(subscript 2) in which all the atoms have a formal charge of zero. Explicitly showing zero charges is optional.

12. ## Sequences

An arithmetic sequence has first term of 6 and difference of 8; what is the tenth term? a10(subscript 10) = ?

13. ## calculous (check)

If air resistance is neglected, a falling object travels 13 ft during the first second, 39 ft during the next, 65 ft during the next, and so on. These distances form the arithmetic sequence 13, 39, 65, ... .In this sequence, a(subscript)1 = 13 d equals 26.

14. ## PHYSICS

How do I solve this? Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.6 kg and an initial velocity of nu Overscript

15. ## physics

A particle of mass m starts from x subscript o = 0 m with V subscript o > 0 m/s. The particle experiences the variable force F subscript x = F subscript o sin (cx) as it moves to the right along the x-axis, where F subscript o and c are constants. I have

16. ## Calculus/Physics?

Define a function f(v)={c:v€[0,v(subscript)0) 0 : v€ [v(subscript)0,+∞} On v €[0,+∞). Here and v(subscript)0 are positive constants. A) Compute ∫v=0,+∞; f(v)dv B) Suppose c=1/v(subscript)0, find ∫v=0,+∞;v f (v)dv

17. ## Algebra

Find the first 4 terms of the recursively defined sequence. a subscript 1 =9​, a subscript 2 =9​, a Subscript n+1=a Subscript n +a Subscript n-1 Are the first four terms A)9,9,18,18 B)9,9,9,27 C)9,9,81,729 D)9,9,18,27

18. ## Chemistry

Three double bonds in Cyclohexene (CH subscript 3) 3 (another subscript) CCl with AlCl (subscript 3) as a catalyst results in what? Then, that added with HNo (subscript 3) and sulfuric acid as a catalyst becomes one minor and one major result. What are

19. ## Chemistry

Which element has no stable isotopes? 1. (subscript)27 Co 2. (subscript)51 Sb 3. (subscript)90 Th 4. (subscript)82 Pb I believe it's either 2 or 3, but I can't decide which. I'm not sure how to go about answering this question, how can you tell which have

20. ## physics

I really need help on D part of the following problem: A clever engineer designs a "sprong" that obeys the force law F subscript e = -q(x - x subscript e)^3, where x subscript e is the equilibrium position of the end of the sprong and q is the sprong

21. ## math

Determine the value of each of the following logarithmic expressions. Do not change bases. A) log8 4

22. ## Chemistry

What symbol is used to show the standard reduction potential of an oxidation reaction in a half cell? The sub means what follows is a subscript So the 0 is a superscript and the sub is its subscript E^0 sub cell*** E^0 sub red E^0 sub oxid All of the above

23. ## O. Chem

Provide the products and curved-arrow mechanism for the formation of these products: CH(subscript)3O^-+CH(subscript)3SH -> ????

A hydrate of barium chloride has the formula BaCl subscript 2 dot XH subscript 2 O.If a 1.055g sample of the hydrate contains 0.157g H2O, what is the "X" in the formula?

25. ## Chemistry

The LD (subscript 50) for a drug dose that would be fatal for 50% of the population. The LD (subscript 50)for aspirin in rats is 1.75 grams/kilogram of body weight. Calculate how many aspirin tablets a human weighing 155 pounds would have to take to reach

26. ## Chemistry

Hi this question is on my study guide and I want to make sure I get to the right answer and know why. Calculate K for the synthesis of ammonia at 400°C N2(g) + 3 H2(g) —> 2 NH3(g)

27. ## Algebra

The following problem refers to an arithmetic sequence. If a_4 = 15 and a_10 = 39, find a_40 and S_40. The _ represents subscript

29. ## chem

answer the following questions assuming that m (subscript s) could have three values rather than two and the rules for n, l and m (subscript l) are the normal ones. 1. how many electrons would an orbital be able to hold? 2. how many elements would the

30. ## chemm

A car air bag requires 70. L of nitrogen gas to inflate properly. The following equation represents the production of nitrogen gas: 2NAN subscript 3 yielding 2NA + 3N subscript 2 the density of nitrogen gas is typically 1.16 g/L at room temperature. How

31. ## Chemistry

Can you balance this equation please? Fe2O3 + CO yeilds Fe + CO2 Fe2O3 + CO ==> Fe + CO2 Rule: balance by changing coefficients. You may not change subscripts. Look at the Fe atoms. There are 2 Fe atoms on the left and only 1 on the right; therefore, we

I have 3 problems I need my answers confirmed for. The solution for log subscript 3 1/9 = x is the solution -1/2? Secondl, what is the solution for 9^2x = 3^x+6 does x=2? Lastley is the answer to 3 ^5x+2 = 81 does x= 2/5? Help sincerely appreciated! The

33. ## Precalculus

Find a(subscript 6) of an arithmetic sequ3nce if a(subscript 4)=5 and a(subscript 9)=20. The value of an increases 15/5 = 3 per term. Therefore a4 = 5 a5 = 8 a6 = 11 a7 = 14 a8 = 17 19 = 20 The last term in my previous post should have been labeled a9, not

34. ## CHEMISTRY

I am having trouble balancing this equation: Ca(OH){subscript 2} + (NH{subscript 4}){subscript 2} SO{subscript 4} -> CaSO{subscript 4} + NH{subscript 3} + H{subscript 2} O Please help, thanks. Response Ca(OH)2 + (NH4)2SO4 --> CaSO4+ 2NH3 + ?___H2O I'm

35. ## Chemistry

Calculate the amount (g) of each of the following salts that need to be added to a 200 mL volumetric flask to produce a 2 M solution of S. CaSO(subscript 4) [NH(subscript 4)subscript 2]SO(subscript 4) NOTE: the subscript 2 is outside the (NHsubscript 4)

36. ## CHEMISTRY

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again. Response Al2(SO4)3 + 3ZnCl2 ---> 2AlCl3 + ?___ZnSO4 Why do you have "?____"

37. ## CHEMISTRY

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again. Responses Al2(SO4)3 + 3ZnCl2 ---> 2AlCl3 + ?___ZnSO4 What is your thinking?

38. ## physics

A particle of mass m starts from x subscript o = 0 m with V subscript o > 0 m/s. The particle experiences the variable force F subscript x = F subscript o sin (cx) as it moves to the right along the x-axis, where F subscript o and c are constants. I have

39. ## Math Proof

Prove that for all integers n > or = 1 and all real numbers x subscript 1, x subscript 2,...., x subscript n. absolute value of (x subscript 1+ x subscript 2+...+ x subscript n)

40. ## Chemistry

Here's one last equation I can't balance: Al{subscript 2}(SO{subscript 4}){subscript 3} + ZnCl{subscript 2} -> AlCl{subscript 3} + ZnSO{subscript 4} Please help, and thanks again.

41. ## Chemistry

I am having trouble balancing this equation: Ca(OH){subscript 2} + (NH{subscript 4}){subscript 2} SO{subscript 4} -> CaSO{subscript 4} + NH{subscript 3} + H{subscript 2} O Please help, thanks.

42. ## science

How many grams of water, H(subscript 2)O, and propene, C(subscript 3)H(subscript 6), can be formed from the reaction of 6.0 g of 2-propanol, C(subscript 3)H(subscript 8)O?

43. ## Science

Na subscript 2SO subscript 4 + CaCl subscript 2 produces CaSO subscript 4 + NaCl Please help me balance this equation and show your work

44. ## Precalculus

Find d of an arithmetic sequence if a(subscript 4)=14 and a (subscript 11)=35 I assume d is the difference between successive terms, since you have said this is an 'arithmetic' sequence. Increasing the subscript by 5 increases the value of the term by 35.

45. ## Math

Obtain the differential equation from the following: 1. y=C(subscript 1)e^x+ C(subscript 2)xe^x 2. y=[C(subscript 1)e^2x]cos3x+[C(subscript 2)e^2x]sin3x

46. ## precalc

Let a subscript n be the remainder when n is divided by 5. a)find a subscript 11 and a subscript 400 b) if a subscript m =3, find a subscript (m +4)

47. ## Math Exam Tuesday

My friend swears by your site so I thought I'd confirm some of my more difficult answers for my math practice exam. Is the solution set for 8^x = 16^ x+2 is it -2? Next is the solution set for log subscript 5 (2x + 3) = 2 is the answer 7/2? Lastly is the

48. ## chem

if the reaction type is Synthesis then what would be the product of.. Fe subscript 2 O subscript 3 + H subscript 2 O

49. ## Chemistry

I have to write a X and Y subscript. If I wanted to put Fe(iron II) charge +2 and N (niterogen) -3 how would that subscript look? Im not use if those would even be able to go together. But if not can you help me fine a +2 and -3 charge is be able to turn

50. ## Math

Express as a single logarithm. 1/2log(subscript)3 144-log(subscript)3 4+2log(subscript)3 3 Please Help!I just can't seem to get the correct answer when I do it.

51. ## Statistics

If Y' = a +bX for all i and a=the mean of Y - b*the mean of X, prove that SigmaY' = SigmaY (subscript i). Hint: replace a with mean of Y minus b*mean of X and take the sum of both sides of the equation--that is, SigmaY'(subscript i)=Sigma(mean of Y-b*Mean

52. ## Math

What is the real value of x in the equation log(subscript 2)24-log(subscript 2)3=log(subscript 5)x? I really cannot remember at all how logs work. I know the answer is 125 but have no idea how to get there. Thanks in advance.

In the redox reaction: 2FeS + 4.5 O(subscript 2)+ 2H(subscript 2)O > Fe(subscript 2)O(subscript 3) + 2H(subscript 2)SO(subscript 4) Fe is oxidized or reduced (select one) from ___ to ___. S is oxidized or reduced (select one) from ___ to ___.

54. ## Precalculus

I'm studying for my precalc exam and have completed 42 practice problems. I have 3 I need to answer that I can't. Please help. What is the base of the function G(x) = log subscript b x if it's graph has points (16,4)? Using the properties of logarithms how

55. ## Chemistry Help

Good morning, I would like to ask some questions. 1. Is KNO subscript 3 named potassium nitrate 2. Is NaOH named sodium Hydroxide 3. Cu(No subscript 3) subscript 2 named Copper(II) nitrate 4. PCl subscript 3 named phosphate trichloride 5. Can you help me

56. ## Chemistry

I am working with cations, and anions. Are you supposed to have the subscripts balance, or the top numbers? Or both? Why would a cation of AL +3( upper corner) and an anion of PO -3 in the upper corner 3 as the subscript become a compound of

57. ## statistics

how do I find s subscript x and s subscript y for b1 = r(Sy/Sx)? Found in linear regression.

58. ## math

Find the value of each of the following. Leave your answers as fractions where appropriate. Do not change bases. a) log4 (1/8) B)10^(-10log3)

59. ## Chem:DrBob

Thank you for the informative answer yesterday. I hope you can help me with this one too. Thanks S(subscript 8) + O( subscript 2) -> SO3 Could you explain why it O3 when S valence is -2? Thanks

60. ## Chemistry

What volume will the following quantities of gases occupy at STP? 5.0 g of H(2) subscript=2 228.0 g of N(2) subscript=2

61. ## Algebra 2 once more

I have more answers that I would like checked. Also, there is one that I'm really confused about. I appreciate any help. :) Rewrite as the log of a single number. 1) 8 ln 2 = ln(2^8) 2) log 42 - log 6 = log 36 (I think this one may be wrong). Evalute each

62. ## statistics

Determine the condition on coefficients "a subscript i" so that the linear combination "Summation symbol from i=1 to n for 'a subcript i'times 'X subscript i'" is an unbiased estimate of E[X].

63. ## Calculus

Find the partial derivative y with respect to s for the following function: y=[((x1)^2)+(x1)(x2)+((x2)^2)]/((x1)+(x2)) where x1=s+2 and x2=s^2+t^2+t . x1 means x subscript 1 x2 means x subscript 2

64. ## chemistry

Write the relevant chemical equations that will allow you to separate the following cations : 1-Hg subscript 2 2-Cation 2+, 2-Pb2+, 2-NH subscript 4 cation + 5- MN2+, and Fe3+

65. ## Chemistry

1. I do not understand why this cannot go to equilibrium? Na2CO3(aq)+HCl(aq)->H2O(l)+CO2(g)+NaCl(aq) Please explain. 2. Are K subscript c the same as K subscript eq? Do they both stand for the equilibrium constant?

66. ## Chemistry

Given 80g of Calcium reacts with Fluorine at STP, how many atoms of Fluorine are consumed? Heres the formula: Ca (s) + F(subscript 2) --> CaF(subscript 2) How do i do this? Thanks! Jackie

67. ## math

log(subscript)2 (x+5) + log(subscript)2 (x-1) =4 find the extraneous root

68. ## Chem

superscript:226 element:Z subscript:29 Whats does the subscript and superscript represent?

69. ## Chemistry

I am writing out ionic compounds. The compound given is Fe(subscript)2O(subscript)3. I noticed on the periodic table iron had a charge of 3+/2+. Which should I then write down in the cation column of my ionic compound chart? Thank you.

70. ## Chemistry II class

Homework due tomorrow. I have no tutor but need answers! Cyclohexene with CH3 subscript again 3 bwecomes something Then that added to HNO (subscript 3) becomes somethings (minor/major) those added to SO (subsript 4) with Sulfuric acid as a catalyst become

71. ## bio - cell and molec

for what values of delta G would the following reactions have? (no numerical value, just positive or negative) a. ATP -> ADP + P(subscript i) b. ADP + P(subscript i) -> ATP c. Glucose -> Pyruvate d. glocose -> oxygen e. starch -> glucose

72. ## Chemistry

I'm currently learning about balancing chemical equation but I don't understand the equation below. 2FE + 3CL(subscript 2) -> 2FECL(subscript 3) I understand 2FE balance out but how did 3CL2 became CL3? Thanks

73. ## Physics

v(subscript)t = g/k, describe the effects that changing the value of k would have on the terminal velocity of the object. v(subscript)t is terminal velocity, k is a constant dependent on the size and shape of the falling object. Help, please.

74. ## math

Solve for x in the following equations. (4 marks) log3(x - 5) + log3(x + 3) = 2

75. ## logs

how would you use log which has a subscript of 2 5 to approximate log subscript 2 50 and log subscript 2 0.4?

76. ## science

How do you find out the number of atoms in a chemical formula? Count up the number of atoms in the formula. If there is a subscript n after an element sytmbol, there are n or those atoms in the molecule. If there is no subscript, there is only one atom of

78. ## Phys (Are my answers correct?)

1. Vector A=71 grams @138 degrees. What is Ax? (x is a subscript) 2. Vector A=71 grams @ 138 degress. What is Ay? (y is a subscript). Answers: 1. -52.8 (I am not sure if it is the absolute value and I should write it as positive. 2. 47.5 Those answers are

79. ## Chemistry

given that: delta H [Cl(g)]=121.3 kJ*mol^(-1) delta H [C(g)]= 716.7 kJ*mol^(-1) delta H [CCl(subscript 4)(g)] =-95.7kJ*mol^(-1) calculate the average molar bond enthalpy of the carbon-chlorine bond in a CCl(subscript 4) molecule.

80. ## AP Physics

Hello I was trying to find the proof of the formula x = x0 + v0t +.5at^2 were the zeros are subscripts My text book dosen't explain it that well. ok well it involves the formula for average velocity aver velocity = 2^-1(v0 + v) were the zero is a subscript

81. ## Chemistry

I think I get ionic compounds now. I'm just a bit unsure about my answers for these ones. 4. The cation is Au^3+ and the anion was SiO3subscript^-2. For the compound, I wrote (Au subscript2)subscript SiOsubscript3. Is this correct? Would it be called Gold

82. ## Pre-Calculus

Find P_(k+1) if P_(k)=2^(k-1)/k! (I used _ as a sign for a subscript) A. 2^(k+1)/(k+1)! B. 2^k/(k+1)! C. 2^(k+1)/k!+1 D. 2k/k!+1 Thank you

83. ## Science

For a cell of the CsCl type (figure 9.18), how is the length of one side of the cell,s, related to the sum of the radii of the ions, r subscript cation + r subscript anion? Figure 9.18 : i . imgur . com / zHj2SGW.png Another question : Consider the NaCl

84. ## AP Chem - Science

For a cell of the CsCl type (figure 9.18), how is the length of one side of the cell,s, related to the sum of the radii of the ions, r subscript cation + r subscript anion? Figure 9.18 : i . imgur . com / zHj2SGW.png Another question : Consider the NaCl

85. ## logarithmic functions

log(subscript 2)(0.5) I know how to convert it into: 0.5 = 2^(y) but then how do I find y?

86. ## Math

Find a formula for D^n_x(1/x). (The n is superscript and the x is subscript)

87. ## Math

Find a general term a Subscript n for the​ sequence, whose first four terms are given. 4,6,8,10

88. ## Chemistry

I had to find the numbers of atoms in 2 Al (NOsubscript 3)subscript 3. I got 16, but the answer in my book is 26. Who is incorret? Thanks!!!

89. ## Science

What is a subscript? Why is it important?

90. ## math

Solve for x a) e^2x+1=74 b) Log3x=4 (3 is subscript)

91. ## math

a) Log2(x^2 – 9/x^3)^3

92. ## Chemistry

How many of O is in the formula 4Cu(OH)2 ? (The 2 is the subscript)

93. ## chemistry

MgO ---> Mg + O or is it Mg + O2 (subscript) since o is usually diatomic

94. ## precalc

So if f(x) = log subscript 5 x then the value of 125 is -3 and the value of 1/25 is -2. Right?

So if f(x) = log subscript 5 x then the value of 125 is -3 and the value of 1/25 is -2. Right? No, yes.

96. ## College Algebra

Solve for x: 3^(2x)=14 We've gotten: 2x=log(subscript 3)14=2.4 Is this two answers, or what?

97. ## MATH

Simplify p^(logp 12 - log p3) *The 'p's are subscript

98. ## trig

If f(x) + log 2 (subscript 2) and g(x) = 2x (squared) + 14, determine the value of (f o g)(5)

99. ## chemistry

how many grams are in 5.66 mol of CaCO3? (the three is the subscript)

100. ## 12 Math

Evaluate each logarithm. log^2(subscript)36^3