04/14/16

pysics rotational motion
concrete mixture is made by mixing cement,stone and sand in a rotating cylindrical drum.if the drum rotates too fast,the ingredients remain stuck to the wall of the drum and proper mixing of the... more
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03/29/16

Lewis Structure problem
I AM SO CONFUSED WITH THIS ONE CHOICES ARE 3,4,5,6,7   Phosphorus oxychloride has the chemical formula POCl3, with P as the central atom. In order to minimize formal charge, how many bonds does... more
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03/27/16

Statistics Question: The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F
The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F and a standard deviation of 0.60° F. If 36 summer days in Orlando are randomly selected, find the... more
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03/24/16

Integal and antiderivative.
Find the area of the region bounded by the curves y=sin‾¹⌈×⁄2⌉, y = 0, and x = 2 obtained by integrating with respect to y. Your work must include the definite integral and the antiderivative.
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03/24/16

The base of a solid
The base of a solid in the xy-plane is the first-quadrant region bounded y = x and y = x² Cross sections of the solid perpendicular to the x-axis are semicircles. What is the volume, in cubic... more
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03/20/16

large flask with volume of 936 mL is evacuated and found to have a mass of 134.
A large flask with a volume of 936 mL is evacuated and found to have a mass of 134.66 g. It is then filled to a pressure of 0.967 atm at 31 °C with a gas of unknown molar mass and then reweighed to... more
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03/19/16

What are the sources of error for the combustion of acetylene gas
 4 test tubes have been filled with different amounts of acetylene. One completly full , half full and so on. The one with less acetylene produced a complete combustion. What are the sources of... more
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03/19/16

draw the organic product (if any) expected from each reaction. ch3ch2ch2ch2oh
how do i draw the organic product espected from ch3ch2ch2ch2oh
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03/09/16

object velocity
For an object whose velocity in ft/sec is given by v(t) = sin(t), what is its distance, in feet, travelled on the interval t = 1 to t = 5? (2 points) 0.45 0.26 2.82 0.03
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02/28/16

could someone help me with math?
Factor the following trinomial completely. Look first for the greatest common factor.20r4-48r3 3-36r2
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02/26/16

What amount of energy would be needed to produce 6moles of nitrogen dioxide!?
the equation is :  N2(g) + 2O2(g) + 67.6kJ ---> 2NO2(g) 
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02/26/16

could someone help me understand this?
Factor the following problem completely. First factor out the greatest common factor, and then factor the remaining trinomial.   r5+3r4 +18r3
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02/25/16

Given a parabola with a focus of (-2, -4) and a directrix of y=2 - write the quadratic equation that describes the parabola
We are making an equation with the graph
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02/19/16

Algebra 2 question?
Jena and Cara, working together, can rake the yard in 5 hours. Working alone, Cara takes five times as long as Jena. How long does it take Jena to rake the yard alone?
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02/19/16

minimize/maximize
Use linear programming to find the ordered pairs (x,Y) that maximize and minmize the objective equation P=-2x+3y subject to the foloowing constaints: x ≥l to 0,, y ≥ to 0, x+2y≤4, and x-y≤1. List... more
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02/16/16

Find the line orthogonal to plane
Find the line orthogonal to plane spanned by vector v= i-5j and vector 3k passing through (2,3,1)
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02/15/16

stoichomtryof gases
5. What mass of sulfur must be used to produce 12.61 L of gaseous sulfur dioxide at STP according to the following equation?S8(s) + 8O2(g) ? 8SO2(g)
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02/15/16

The two points do not lie on the line L. Can you always find a point on the line that is the same distance from each of the two points?
Two points are on the opposite sides of a straight line L. Remember that a line extends forever in two directions. The two points do not lie on the line L. Can you always find a point on the line... more
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02/04/16

Circular Measure
A semicircle of radius 10 cm has diameter AB. AP and AQ are chords of lengths 6 cm and 8 cm respectively.Calculate the are bounded by these two chords and the arc PQ.
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01/30/16

indefinite integral problem? integral((2+5x)/(sqaure root of 1-25x^2)) Thanks.
Use U-substitution to integrate.
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01/26/16

fluorescent light bulbs last, on average 10,000 hpurs. the standard diviation is 500 hours.what percent of the light bulbs burn out within 11,000 hours?
 i need to find out what percent of lightbulbs burn out within 11,000 hours
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01/25/16

Statistics
I DID NOT QUITE UNDERSTAND THIS, IF U CAN EXPLAIN I WOULD GET IT.   The scores on a test given to all juniors in a school district are normally distributed with a mean of 74 and a standard... more
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01/25/16

What could be the values in the data set?
The median of a set of data is 2/3 of the greatest value and 1 2/5 of the least value. The data set has 7 numbers that are all whole numbers. The mean of the data set is equal to the median.
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01/25/16

There must be 7 pieces of data, the range is 40, the mean is greater than the median, there is no mode, you must have one outlier
Can somebody please help me with this question? I need an answer that is 7 pieces of data.
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01/25/16

Determine the value of h such that the matrix is the augmented matrix of a consistent linear system.
 6     -3   h -12  6    4
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