# Posts by Matt

Total # Posts: 2,409

1. ### maths

i thought they said you couldnt contact anyone online.... i might respond when i get up to that question
2. ### math

the 2 isopentagons for c are (10, 1, 9, 1, 10) and (8, 5, 3, 5, 8) i found it through trial and error, but i wont give you all the answers, you can draw them and do it yourself.
3. ### math

i think that is all, i cant think of any others
4. ### math

how many students are in the sample 15 20 22 25
5. ### math

Find the partial sum without using a graphing utility. 100 2n n = 1
6. ### History

OMG I MEANT HISTORY IM SOO OFF TRACK :(
7. ### Math

what allowed for the expansion of the ranching industry a. laws created by the government prohibited cattle drivers from cutting barbed wire. b.American Indians and buffalo had been removed from the plain of North Texas*** c. railroads allowed for sedentary ranchers to take ...
8. ### Math

on a map whose scale is 1:50000 a piece of land is represented by a rectangle measuring 3 cm by 2 cm. What is the actual size of this land in hectares?
9. ### math

72 divided by 6 =
10. ### Math

3/8 + 3/8 + 3/8 + 3/8 + 3/8 = 15/8 2 5/8 = 21/8 (2 x 8 + 5 = 21) 21/8 - 15/8 = 6/8
11. ### chem

I have a problem like this and dod not know how to do it either :/
12. ### Physics

A ball of mass 8.0kg is suspended by two wires from a horizontal arm of 0.8m, which is attached to a vertical shaft. If wire 1 is 0.6m and wire 2 is 1.0m, what is the tension of wire 1 if the vertical shaft is in uniform rotation about its axis such that the ball equals 2.3m/s?

\$0
14. ### Physical Chemistry

Your hot tub has overheated to a very uncomfortable 48 degrees C. If your hot tub contains 402 L of hot water, what mass of ice at -5 degrees C would you need to add to your hot tub to bring the temperature down to a more comfortable 36 degrees C?
15. ### Physical Chemistry

Is there an equation that I can use that has concentration and temperature together?
16. ### Physical Chemistry

One potential problem with using molarity to express concentration is that molarity is temperature dependent. If you make a 1.000 M solution of aqueous HCl at 25 degrees celsius, what would the molarity of this solution become if the temperature of the solution is elevated to ...
17. ### Chemistry

1 mole of each of the following substances is dissolved in 1 L of water. Order them from most ions (1.) to least ions (4.) in solution. CH2CH2-OH ZnCl2 H2SO3 NaNO3
18. ### math

Shonda buys an Amalgamated dining room furniture set for \$10,000, makes a down payment of 20%, and finances the rest with 60-month store financing at an annual interest rate of 5.4% compounded monthly. What is the amount of her monthly loan payment to amortize the loan?

thanks!
20. ### math

(x^2-x-20)/(x^2-25) My teacher said that the first step is to factor everything. I know that x^2-25 is factored as (x-5) (x+5), but still need help with factoring x^2-x-20.
21. ### math

A pair of 6 sided fair dice are rolled. If one of the dice shows an odd number what is the probability of the sum of the dice being 7 ?
22. ### RE: Reiny

answer 525 that's a lot of sandwiches
23. ### chemistry

Which one of the two salts precipitated? AgNO3 + K2SO4 = Ag2SO4 + KNO3
24. ### math

Consider a roll of two six sides dice. Let A be the event that the sum of the faces showing is 4. Let B be the event that one of the faces showing is 3. What is the union of A and B ? What is the intersection of A and B ?
25. ### physics

Island A is 500km east and 320km south of Island B. Island C is 75km east and 1015km north of island A. find the components of the (delta)r vector value pointing from island B to island C
26. ### Maths

show that the circles x^2 + y^2 - 10x - 8y + 18 = 0 and x^2 + y^2 - 8x - 4y + 14x = 0 do not intersect. Apologies on behalf of my friend
27. ### Math (Probability)

Suppose that 4 cards are drawn from a well-shuffled deck of 52 cards. What is the probability that all 4 are hearts? There are 13 hearts of 52 cards. So, where do I go from here to solve the equation?
28. ### physics

A block with a mass of 2.85 kg is hung by a vertical spring of stiffness 13.3 kg/s2. The damping force is given by -b(dx/dt)m where b = 364 g/s. The block is pulled down 12 cm and then released. (a) Calculate the time required for the amplitude of the resulting oscillations to...
29. ### maths probability plz help

The Probability that a USA-based business man goes to paris by car is 0.6 and by air is 0.4. If he goes by car, the probability that he will be early for his appointment is 0.3 while if he goes by air, the probability he'll be early is 0.65 (i) what is the probability that...
30. ### physics

A playground merry-go-round of radius R = 1.1 m has a moment of inertia of I = 280 kg*m^2. and is rotating at a rate of ? = 9 rev/min around a frictionless vertical axis. Facing the axle, a 37 kg child hops onto the merry-go-round and manages to sit down on the edge. What is ...
31. ### physics

A 2.51 kg particle moves in the xy plane with a velocity of v = ( 4.98 , -3.58 ) m/s. Determine the angular momentum of the particle about the origin when its position vector is r = ( 1.73 , 1.15 ) m.
32. ### Linear Algebra

Hi, I really need help with these True/False questions: (a) If three vectors in R^3 are orthonormal then they form a basis in R^3. (b) If Q is square orthogonal matrix such that Q^2018 = I then Q^2017 = Q^T. (c) If B is square orthogonal matrix then B^?1 = B^T. (d) If for some...
33. ### Math

an 8% solution, a 10% solution, and a 20% solution of sulfuric acid are to be mixed to get 100 milliliters of a 12% solution. How many milliliters of each must be mixed if the volume of the 20% solution must be 25 milliliters less than the volume of the 10% solution
34. ### Algebra

Multiply -4b by 1-b/b? I did -4b/1 × 1-b/ b But my answer isn't adding up?
35. ### Math

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10. It is a rectangle with a x in the middle.
36. ### Math

It is a rectangle with a X in the middle
37. ### Math

Can't post picture
38. ### Math

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10.
39. ### Geometry

No that does not work
40. ### Geometry

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10.

2 2 3 ok

3000
43. ### Analytical Chemistry

A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with ...
44. ### Math

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23? Is the answer five or six students?
45. ### Physics

What is the total amount of potential energy that can be stored in a 10,000 gallon water tower built with the water tank 61.50 m above ground level? <hint: You will need to look up the mass of a gallon of water in Kilograms>
46. ### Physics

A 250.0 kg motorcycle can roll 45.9 m up a long hill before coming to a stop if the motorcycle approaches the base of the hill 30.0 m/s.
47. ### math

domain- -7<x<2 range- -8<y<7
48. ### algebra

does it say how many coins total
49. ### Physics

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 1.5 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 3.2 kg and is initially at rest. The collision is not head-on. ...
50. ### Calculus (vectors)

A plane must travel S15E at 720km/h. If the wind Is from S35W at 130km/h, what heading and airspeed should the pilot set to reach the destination. I got 648km/h E8.89S
51. ### Math

Is 21/2 a fraction or division?
52. ### Science

Bb is an example of an organism's ______. "Bb" is from Punnett square
53. ### Math

A rectangular Persian carpet has a perimeter of 216 inches. The length of the carpet is 30 inches more than the width. What is the dimension of the carpet
54. ### Integral Calculus

Thanks, Steve. Now I got parts b and c down. How would I go about doing parts d and e?
55. ### Integral Calculus

We can use this power series to approximate the constant pi: arctan(x) = (summation from n = 1 to infinity) of ((-1)^n * x^(2n+1))/(2n+1) a) First evaluate arctan(1) without the given series. (I know this is pi/4) b) Use your answer from part (a) and the power series to find a...
56. ### Calculus application of sin function

a horizontal position of the pendulum of a grandfather clock can be modelled by h(t)=Acos(2(pi)t/T), where A is amplitude of the pendulum in meters, t is time in seconds, and T is the period of the pendulum, in seconds. If the pendulum has a velocity of v(t)=sin Pi(t) find: A...
57. ### Calculus

Find the local maximum and minimum values of the following curve within the given domain. y=SECx-TANx 0 ? x ? 2?
58. ### Calculus

determine all asymtote(s) of f(x)= 1/(x(x-1)^2) using limits
59. ### Calculus

find the point(s) of inflection on the function f(x)= 10x + 10/x
60. ### Math, Surds

The area of a square vegetable guarden is 60m^2. a) What is the exact length of each side of the garden? b) If a fence of a chicken wire is to be constructed around the vegetable garden, what length (to the nearest meter) of chicken wire is needed. It needs to be answered in ...
61. ### Calculus

the question asked for 144 not 114, if you plug in 144 you will get x=4
62. ### Calc

Find the value(s) of c guaranteed by the Mean Value Theorem for Integrals for the function over the given interval. f(x) = 4?x [4, 9]
63. ### Math

Use the limit process to find the area of the region between the graph of the function and the x-axis over the given y-interval. g(y) = 4y2 ? y3, 1 ? y ? 3
64. ### Math

On a trip of d miles to another city, a truck driver's average speed was x miles per hour. On the return trip the average speed was y miles per hour. The average speed for the round trip was 50 miles per hour. Show that y=25x/(x-25) Find the limit of y as x approaches 25 ...
65. ### Math

The measurement of the radius of a circle is 16 inches, with a possible error of .25 inches. Use differentials to approximate the possible propagate error in computing the area of the circle.
66. ### Integral Calculus

I am unable to find the formula for this given sequence: {2, -6/4, 24/16, -120/64, 720/256,...} So far, I know it's at least this: a(sub(n)) = ((-1)^(n+1))/(4^(n-1)) Basically, all I'm having trouble with is finding the pattern between the numerators. If anybody can ...
67. ### Algebra

Solve. x^2-xy+3y^2=15, x-y=2 Thank you
68. ### Algebra

Find an equation of a hyperbola with vertices (0?,3) and ?(?4?,3) and e=3/2. Thank you
69. ### Algebra

which equation represents the relationship shown in the table below? x | 0 | 1 | 2 | 3 | __________________ y | -3 | -1 | 1 | 3 | a.) y = -x - 3 b.) y = x - 3 c.) y = 2x - 3 d.) y = -2x + 3
70. ### Physics

A 125-g arrow is shot vertically upward with an initial speed of 28 m/s. Assuming 30% loss in total mechanical energy while ascending, what maximum height above the position from which it was shot does the arrow reach?
71. ### Maths

During a run of bad luck a player lost 25% of her points each half hour. She started with 256 points. How much would she have left after 2 hours
72. ### Physics

Suppose that instead of our sun, our star were a giant star such as Betelgeuse. The mass of Betelgeuse is estimated to be about 20 times that of our sun. With earth in the same orbit? With its same mass, how long would our year be in earth days if we orbited Betelgeuse?
73. ### Physics

A) the earth year is 365.25 days long. How long would our year be if earth followed the same orbit, but was only the mass of Mars? Answer this in earth days. B) How long would our year be if earth were the same mass, but had the orbital distance of mercury Answer this in earth...
74. ### Physics

At a height of 500km above earth, a satellite will orbit the earth once every 95 minutes. Find the mass of the earth based on this idea. B) How far above earth's surface would a satellite need to orbit so that it revolves at exactly the same rate as the earth's rotation?
75. ### Physics - Circular motion

A domesticated pig places a 100g rubber puck on a turntable. The turntable is set at a rate of 78rpm,and the pig knows the coefficient of static friction is 0.37 between the puck and turntable surface. A) How far out from the center of the turntable can the puck be places ...
76. ### Physics - circular motion

You approach a slight bump in the road on the highway in a car. The bump carries you into a circular (convex) vertical arc of radius 39m. A) choosing two different cars ( it is for you to choose 2 particular models, providing the mass of each), at what maximum speed can you ...
77. ### physics

quarterback throws a pass to a receiver, who catches it at the same height as the pass us thrown, The initial velocity of the ball is 15.0 m/s, at an angle of 25.0 degrees above the horizontal. How long is the ball in the air?
78. ### Calculus

Use the limit process to find the area of the region between the graph of the function and the y-axis over the given y-interval. f(y) = 7y, 0 ≤ y ≤ 2
79. ### Biomechanics

An athlete jumps straight upwards at 2.5 m/s, find: 1. a) total flight time 2. b) maximum jump height
80. ### Calculus

differentiate the given function, simplify your answer by leaving no negative or rational exponents. final answer should be in factored form where possible. y=(x^2 +2x)^3(x+2)
81. ### Calculus

A nut store sells 200 bags of almonds per month at a price of \$5 per bag. For every \$0.20 decrease in the price, the store sells five more bags per month. Determine the marginal revenue when 120 bags are sold.
82. ### Calculus

A nut store sells 200 bags of almonds per month at a price of \$5 per bag. For every \$0.20 decrease in the price, the store sells five more bags per month. Determine the marginal revenue when 120 bags are sold.
83. ### Calculus

The demand function for a bottle of hand lotion is p(x)=0.78+0.0003x, where x is the number of bottles sold and p is the price, in dollars. The cost function is c(x)=480-0.32x+0.0005x^2. Find the marginal profit when 700 bottles of hand lotion are sold.
84. ### Calculus

is that 1/9 or 1/3
85. ### Calculus

Determine the coordinates of the point on the graph of f(x)=3x^2-7x+4 where the tangent line is parallel to the line 5x+y=3
86. ### Calculus

find the point, (c,f(c)), on f(x)=x^2 in the interval 0≤X≤4, such that f'(c) equals the average rate of change over that interval.
87. ### Calculus

Determine the equation of the tangent to f(x)= (1/x)+x at the point (1,2)
88. ### Organic Chemistry

Butanamide (Amide) vs Aminobutane (Amine) Which compound do you think has the higher melting point? Explain your reasoning.
89. ### Science

Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl-
90. ### Calculus

Lim (√(3-x) - √(3+x)) /x x->0
91. ### Calculus

Lim √(3-x) - √(3+x) x->0 x
92. ### calculus

ok got it thanks
93. ### calculus

thats 0.2m/s right?
94. ### calculus

(Compute all instantaneous rate of change using the limit of the difference quotient) 2) A football's path is represented by the function h(t)=-4.9t^2 +10t+2, where h is its height, in meters, after t seconds. Find the rate of change of the football's height at 1s.
95. ### Calculus

thanks that's a better way to write it
96. ### Calculus

Determine the average rate of change of f(x)=1/(x^2 -x) over the interval 2 is less then or equal to x and 3 is greater or equal to x.
97. ### Physics

An antique cabinet is in the cab of a pickup truck traveling 20.1 m/s and has a coefficient of static friction of 0.250 between the antique and the cab. In the event of a sudden stop, what is the shortest distance the pickup truck can stop without having the cabinet move ...
98. ### physics

a child saw a skunk in a hole of a tree, standing 2.5m away. the child attempted to throw a pebble into the hole but missed with a speed of 11m/s. Angle of elevation is 75 degree, what was the Vfy of the pebble.
99. ### daymon

a child saw a skunk in a hole of a tree, standing 2.5m away. the child attempted to throw a pebble into the hole but missed with a speed of 11m/s. Angle of elevation is 75 degree, what was the Vfy of the pebble.
100. ### Science

Thank you Ms. Sue
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