05/16/20

For incident angle of 30 degrees light shining from air into water from water into air
Just need help figuring out this question because the instructions weren’t clear at all can someone help ?
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05/16/20

Card deck Probability

You pull out a card from a standard deck four times in a row, with replacement each time. Determine the probability that exactly two hearts turn up. 
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05/16/20

Calculate the average reaction rate
Given the data below calculate the average reaction rate between 15s and 90s. Give only the quantity not unittime No2 mol/l0 0.56015 0.44530 ... more
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05/16/20

Use the Midpoint Rule to estimate the volume of the pancreas.
A CAT scan of a human pancreas shows cross-sections spaced 1 cm apart. The pancreas is 12 cm long and the cross-sectional areas, in square centimeters, are 0, 7.7, 15.0, 18.2, 10.4, 10.6, 9.5, 8.6,... more
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05/16/20

dimension analsis
Each year, approximately (1.8 x 107 bales or 9.0 x 108 lb) of cotton are harvested in the United States. A field planted with cotton can produce 7.0 x 102 lb for each acre of land. The fabric... more
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05/15/20

Please Help ASAP
An open box is to be made from a 16 inch by 6 inch piece of cardboard by cutting squares of equal size from the four corners and bending up the sides. What size should the squares be to obtain a... more
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05/15/20

Write y=x2+16x−7 in vertex form. Then identify the vertex
Write y=x^2+16x−7 in vertex form. Then identify the vertex
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05/15/20

solve for x to determine the [OH-] for 0.25 M methylamine, CH3NH2
[OH-] == x[CH3NH2] == 0.25 - x[CH3NH3+] == xKb = 4.00 x 10^-4x == 4.00x10^4 * (0.25-x)/x
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05/15/20

Precalculus question?
Suppose T(t)=23sin(2π(t-7)/24)+66 is the temperature (in degrees Fahrenheit) at time t, where t is measured in hours after midnight on Sunday. You paint the exterior door to your house at 5 p.m. on... more
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05/06/20

Probability Question
20 PC’s are delivered to a school. Suppose that 3 of these are defective. If 8 are selected to be installed today.a) How many different samples of 8 are possible? b) How many samples contain no... more
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05/06/20

sin a=7/25, a lies in quadrant ii, and cos b=2/5, b lies in quadrant i find cos(a-b)
Use the given information to find the exact value of the expression.
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05/06/20

Net Change / Average Rate
A function is given.g(x) = 4/x+9 ; x = 0, x= h a) Determine the net change between the given values of the variable. b) Determine the average rate of change between the given values of the variable.
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05/03/20

How much heat (in Joules) is gained when a 34.5 grams bar of gold is heated from 26.4°C to 75.3°C? Specific heat of gold is 0.129 J/g°C.
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04/22/20

General Chemistry Acids and Base Question

What is the hydroxide ion concentration of a KOH solution that has a pH of 9.20?
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04/22/20

Kinematics Question

  A parachutist jumps from a height of 3.1 x103 m and free-falls for 10 s. She then opens her parachute and for the next 20 s slows down with an acceleration of -4.5 m/s2. After that she falls the... more
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04/20/20

chemistry question
Depending on the types of particles in a solid crystal, the properties differ widely. A chemist is testing three crystalline solids in the lab and has gathered the data in the table below. Use the... more
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04/19/20

Mathematics and geometry
A stone is released from rest at the top of Clif 194.8m high. At the same time a lorry move from rest towards the Clif. If the distance between the Clif and and lorry is 75m, Calculate the speed at... more
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04/19/20

At the city museum child admission is $6.50 and adult admission is $9.80. on Tuesday 142 tickets were sold for a total sale of $1140.80. how many child tickets were sold that day?
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04/19/20

particles and velocity question
The position function of a particle is given below. s(t) = t^3 + 3t^2 -19t,t>=0 When does the particle reach a velocity of 5 m/s?t= ?
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04/19/20

Linear approxiation Please help!
Find the linear approximation of the function f(x) = √16-x at a = 0 and use it to approximate the numbers √15.9 and √15.99.
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04/19/20

Rate of change in the natural and social scienes
The edge of a cube was found to be 30 cm with a possible error in measurement of 0.5 cm. Use differentials to estimate the maximum possible error, relative error, and percentage error in computing... more
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04/19/20

Please help me with another deratives and tangent problem
For what values of x does the graph of f have a horizontal tangent? (Use n as your integer variable. Enter your answers as a comma separatedlist.)f(x)=x-2sin(x)
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04/19/20

How many atoms are in 1.750 moles of zinc
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04/19/20

Silver Ion Concentration

What is the silver ion concentration in a solution prepared by mixing 457 mL 0.378 M silver nitrate with 379 mL 0.495 M sodium carbonate? The Ksp of silver carbonate is 8.1×10-12
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04/16/20

Help on trigonometry please!
How do I find sin θ/2 when tan θ = 2 and 0 degrees<θ<pi/2 using the half angle formula?
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