# Posts by scott

Total # Posts: 4,247

1. ### Physics

the formula is for distance traveled over time (t) ... starting from rest ... with uniform acceleration you're using g , so it must be a falling object the answer looks okay ... BUT (there's always one) ... have you learned about significant figures?
2. ### Physics

free fall equation is ... h = -1/2 g t^2 + ho h = 0 (ground level) , ho = drop height plug in values and solve for t ... the positive value
3. ### physics

(m * g * h) / efficiency convert cm to m ... answer is in Joules
4. ### Math

six quarter miles beyond the \$1.70 for 1 1/2 to 1 3/4 1.70 + (6 * .45) = 4.40 4.40 * 1.1 = ?
5. ### science

find the circumference ... 2 ? r it goes around 3.5 times in one sec ... in one second, the outer edge travels ... 3.5 circumferences
6. ### Physics

velocity = acceleration * time
7. ### Math

the general slope-intercept form is ... y = m x + b ... the coefficient of the x term is the slope (m) ... the constant term is the y-intercept (b)
8. ### Math

the general slope-intercept form is ... y = m x + b ... the coefficient of the x term is the slope ... the constant term is the y-intercept
9. ### math

the 10t/3 that bob talks about is in c
10. ### Geometry

draw lines through the points in the x and y directions find the right triangle whose hypotenuse is the distance you want ... the lengths of the sides are the distances between the two points in the x ... and y directions you can also find the x and y distances by subtracting ...
11. ### physics

there is a "range equation" wikipedia is a good source
12. ### Math

(now / then) * 100%
13. ### Math

-13 = 5 + 20m - 2m
14. ### Physics

h1 = -1/2 g t^2 + 67.0 h2 = -1/2 g t^2 + 20.0 t set the heights equal and solve for t ... substitute back to find the collision height b. v1 = g t ... downward v2 = 20.0 - gt ... downward the 2nd ball reaches its max height and begins to fall back down before the 1st ball ...
15. ### Physics

momentum is conserved , vertically and horizontally the larger piece carries all of the vertical momentum , and horizontal momentum equal and opposite to the smaller piece find the vertical and horizontal momentum vectors and add them
16. ### Physics

the force on the system is the weight (m*g) of the hanging mass ... a = f / m the tension in the string is the force necessary to give the block the calculated acceleration ... t = m a
17. ### physics

grams are ... what do they measure?
18. ### physics

yes centi is the prefix for one hundredth

20. ### Science- Chemistry

1.1E3 mg/mL * 0.18 = ?
21. ### math

74468 = a * [1 + (.03 / 12)]^(12 * 13) log(74468) = log(a) + 156 log(1.0025)
22. ### Algebraic Expressions

the title of the question is "algebraic expressions" (54 - a) / 6
23. ### Math

there are 36 inches in a yard there are 12 inches in a foot convert the measurements to inches and subtract
24. ### math

2 * 8 (15.5 + 12.25) = 444 (450 - 444) / 444 = .01351 ? 1.4% there appear to be several arithmetic errors in your calculations ... but your method is correct

yes
26. ### algebra

it looks like ... g(x) = f(x) + 1 adding 1 to a function results in what kind of translation?

yes
28. ### Math

7 / 28 = ? / 4 = ? / 100 = ? %

yes
30. ### Math

ABO is an isosceles triangle ... AO and BO are radii of the circle ... so angles A and B are equal ... A = B central angle O equals the arc AB ... O = 100º A + B + O = 180º
31. ### Math

25 / 15 = 30 / 18 = ? / ?
32. ### math

tire circumference * rpm * minutes per hour / meters per km 2 * ? * 0.30 * 779 * 60 / 1000
33. ### physics

power = m * g * h / t = 63 * 9.8 * 5.2 / 3.5 (watts)
34. ### math

how many texts do you send in a month?

yes
36. ### Math

how many edges does a cube have?

good
38. ### Maximum area.

one long side is already there 5x + y = 120 ... y = 120 - 5x area = x (120 - 5x^2) = 120x - 5x^2 the max is on the axis of symmetry ... x = -120 / (2 * -5) = 12 y = 60 ... area = 720
39. ### Dimensions of wall

let w = width , length = w + 4 ... cross section area = w (w + 4) width with border = w + (2 * 2) = w + 4 length with border = w + 4 + (2 * 2) = w + 8 area with border = (w + 4) (w + 8) area of border = [(w + 4) (w + 8)] - [w (w + 4)] = 240 solve for w , then substitute back ...
40. ### Math

missing some units and exponents?
41. ### MATH

the common difference is -11 , so there appear to be 10 terms "missing" between -20 and -141

yes

yes

yes
45. ### PHYSICS

you can have 0.1 s OR 2 m...not both (unless it is two different scenarios) stopping in 0.1 s means traveling 0.2 m ... as bob said , 80 N stopping in 2 m takes 1.0 s ... 8 n
46. ### Physics

is the 200 m distance across the round about part of the 2 km?
47. ### physics

the free-fall equation is ... h = -1/2 g t^2 - 15 t + 55 ... g = 9.8 solve for t ... the positive solution
48. ### math

the free-fall equation is ... h = -1/2 g t^2 - 15 t + 55 ... g = 9.8 solve for t ... the positive solution
49. ### MATH

using a z-score table 16% above the mean of a population is approximately .7 s.d.
50. ### math

sin^2 + cos^2 = 1 ... cos = ?(1 - sin^2) = ?[1 - (-2/5)^2] find the cosine ... remember, it's positive in Quad IV sec = 1 / cos ... tan = sin / cos
51. ### Maths

4 (the short side) is multiplied by 7/4 (the enlarging factor) n times to equal 20 (the short side of the large sheet) 4 * 7/4 * 7/4 ... = 20 n is probably not an integer , so just round it down to the next whole number ... no fractional enlargements you can start with 4 and ...
52. ### Maths

4 * [(7/4)^n] = 20
53. ### Math

circumference = 2 * ? * radius if the radius is increased by 6 ft , how much does the circumference increase?
54. ### Math - integers

? is 3.14159... [?] = 3 [-?] = -4
55. ### Science

if you labeled this a math question, it might have been answered sooner
56. ### Science

18 to 26 is 4 terms with a difference of 8 ... so the common difference is ... 8 / 4 = ? the 20th term is 8 terms beyond 26 (the 12th term) ... 26 + 8 differences = ?
57. ### maths

there are 36 ways for two dice to end up 6 of those ways have both dice showing the same number of points
58. ### Science

is there a question for any of the three entries?
59. ### geometry

the dilated points will be 3 times the distance from F as the original points ... the direction is along the line from F to the point being dilated A' is 3 times farther from F than A , along the FA line D is 1/3 the distance from F to D' , along the FD' line F to ...
60. ### Sat Math

this is kind of a solve by inspection (and thought) problem the "magic" value is 10 ... 2x + 6 must be GREATER than 10 (not equal to) how small can x (a positive integer) be , if 2x must be greater than 4?
61. ### Sat Math

y = m^4 ... m = y^(1/4) y = n^3 ... n = y^(1/3) m n = y^[(1/4) + (1/3)]

5 t + 7 c = 1210 t = 3 c substituting ... 5 (3 c) + 7 c = 1210 ... 22 c = 1210 solve for c , then substitute back to find t ann needs ... 8 t + 4 c
63. ### math

an assumption is made that they each drive at some constant speed Mickey ... 40 mi in 4/5 hr ... 40 / (4/5) = 50 mph Dylan reached the city when Mickey had driven 200 mi ... in 4 hr at 50 mph Dylan drove 240 mi in 4 hr ... speed = distance / time
64. ### geometry

1) there are mixed units ... inches and feet ... convert to one or the other and recalculate 2) yes 3) yes ... like a fraction , the answer can be reduced 4) close ... try again ... 4 / 13 = 2 / 6 ??
65. ### math

8 b + 7 c + 10 m = 667000 b + c + m = 76000 b + c = m = 38000 8 b + 7 c = 667000 - 10 m = 667000 - 380000 = 287000 7 b + 7 c = 7 * 38000 = 266000 subtracting equations ... b = 287000 - 266000
66. ### math

p - w = 240 / 1.5 p + w = 240 / 1 adding equations ... 2 p = 400 solve for p , then substitute back to find w
67. ### Algebra

a = 10000 [1 + (.085 / 4)]^(3 * 4)
68. ### math

3 card combinations ... 52C3 black 3 card combinations ... 26C3 red 3 card combinations ... 26C3 probability not same color = 1 - (probability of same color) = 1 - [(2 * 26C3) / 52C3]
69. ### stats

the height range is from 7/18 s.d. below the mean to 3/18 above the mean a z-score table will show the portion of the population that lies in this range ... the portion is equivalent to the probability
70. ### math

how big is the shed?
71. ### Math for 6th Grade

w * 120% = 90 ... w * 1.2 = 90 ... w = 90 / 1.2
72. ### MATH

blatant cheating ... sounds serious ... just curious ... what course is this? ... what text? ... are the answers correct? is someone having a laugh at others' expense?
73. ### MATH

sure ... why not?
74. ### Mathematics

disregard my 1st response
75. ### Mathematics

11 differences ... 75 - 31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... add them ... multiply by half the number of rows
76. ### Mathematics

11 differences ... 75 - 31 = 44 ... 44 / 11 = 4 difference between adjacent rows is 4 find first row and last row ... average them ... multiply by half the number of rows
77. ### Algebra

distribute over the value in parentheses then add like quantities
78. ### math

b + p + m = 734.4 m = b / 4 ... b = 4 m p = m / 3 ... m = 3 p ... b = 12 p substitute to find the solution
79. ### Math

half tank plus quarter tank equals three-quarters tank 3/4 t = 24 ... t = ?
80. ### Math

total momentum is constant in the system the sum of the initial momenta equals the sum of the final momenta find the total and subtract the larger mass after the collision

82. ### math

no ... none of the choices are correct check the transcription of the problem
83. ### Math

are you aware of PEMDAS? ... order of operations none of the offered solutions are correct ... maybe missing parentheses?
84. ### science

there is acceleration in the vertical direction due to the force of gravity ... so vertical velocity changes there is no horizontal acceleration ... so horizontal velocity remains constant

yes
86. ### Math

left and right? i vote for B
87. ### Math

he passes when they are at the same distance ... 10 is correct
88. ### Algebra II

5850 = 4300 e^(8r) ... ln(5850/4300) = 8 r 5850 = d e^(17r)
89. ### Algebra

10^1.0414 = 11
90. ### Algebra

343 = 7^3 loga(343) = 3 loga(7)
91. ### Algebra

a = 480 [1 + (.09 / 4)]^(4 * 8)
92. ### math

158/3 * 4/3 = 632/9 = what mixed number?

there are 5 choices for the 1st (leftmost) digit ... a "leading" zero is not standard form 5 choices for the 2nd digit ... zero is available 4 choices for the 3rd digit 5 * 5 * 4 = ?
94. ### Math

let x equal amount of milk chocolate (25 * 5.5) + (x * 2.9) + [(25 - x) * 4.4] = 50 * 4.5
95. ### Math

[(x-2) / x] + 3/2 = x / (x-2) 2(x-2)^2 + 3x^2 - 6x = 2x^2 2x^2 - 8x + 8 + 3x^2 - 6x = 2x^2 ... 3x^2 - 14x + 8 = 0 there is one positive solution ... 2/4 + 3/2 = 4/2
96. ### Science

angular velocity is in ... radians per second ... rad/s there are 2? radians in one revolution for angular velocity, the length of the radius is immaterial

yes
98. ### binomial probability

probability of prime (1, 2, 3, 5) ... 4/6 = 2/3 ... not prime, composite (4, 6) ... 2/6 = 1/3 (p + n)^6 = p^6 + 6 p^5 n + 15 p^4 n^2 + 20 p^3 n^3 + ... probability 3 prime and 3 not ... 20 * (2/3 * 1/3)^3
99. ### Logarithms

squaring a value doubles the log
100. ### Algebra 2

r = (300 - 15 n) (5 + .50 n) = 1500 + 75 n - 7.5 n^2 the max is on the axis of symmetry ... n = -b / (2 a)