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September 21, 2014

Posts by Jack


Total # Posts: 1,318

Math! Please Check My Answers
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August 14, 2013

Math! Please Check My Answers
*sigh*
August 14, 2013

Math! Please Check My Answers
Anybody there?
August 14, 2013

Math! Please Check My Answers
Please Help!
August 14, 2013

Math! Please Check My Answers
Key: ☺ = My Answer! 2. Write a word phrase for the algebraic expression. 3x - 7 A. The difference of three times a number x and seven. B. The difference of seven and three times a number x. C. Three times a number x fewer than seven. ☺ D. The quotient of three ...
August 14, 2013

College Algebra
Solve system by method of elimination 0.07x + 0.02y =-0.07 0.08x - 0.06y = 0.07
July 24, 2013

College Algebra
Find the equation of the parabola y = ax2 + bx + c that passes through the points. To verify your result, use a graphing utility to plot the points and graph the parabola. (−2, −15), (−1, −4), (1/2,-10) y=?
July 21, 2013

chemistry
Combustion of 1 mol of octane results in the formation of 8 mol of carbon dioxide (CO2) . The molar mass of octane is 114.22 g/mol, and the molar mass of carbon dioxide is 44.01 g/mol. If an engine burns 550.0 g octane as it runs, what mass of carbon dioxide is released into ...
July 17, 2013

chemistry
Combustion of 1 mol of octane results in the formation of 8 mol of carbon dioxide (CO2) . The molar mass of octane is 114.22 g/mol, and the molar mass of carbon dioxide is 44.01 g/mol. If an engine burns 550.0 g octane as it runs, what mass of carbon dioxide is released into ...
July 17, 2013

College Algebra
Find an equation that has the given solutions. (There are many correct answers.) -1/6, -8/9
July 13, 2013

College Algebra
Find all solutions of the equation. Check your solutions in the original equation. (Enter your answers from smallest to largest. Enter NONE in any unused answer blanks.) 16t^2/3 + 40t^1/3 + 25 = 0
July 13, 2013

math
A. 12+x+8=2x 20+x=2x (subtract "x" from both sides) x=20 B. x+2+15=2+2x (subtract "2" from both sides) x+15=2x (subtract "x" from both sides) x=15 (Krista's age) 15+2=17 (Barrie's age now) 17+6=23
July 13, 2013

College Algebra (Urgent)
The demand equation for a product is p = 60 – 0.0004x, where p is the price per unit and x is the number of units sold. The total revenue for selling x units is shown below. Revenue = xp = x(40 – 0.0004x) How many units must be sold to produce a revenue of $260,000...
July 10, 2013

College Algebra
Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in seconds), as the model ...
July 9, 2013

College Algebra
A rancher has 100 meters of fencing to enclose two adjacent rectangular corrals (see figure). The rancher wants the enclosed area to be 374 square meters. What dimensions should the rancher use to obtain this area? (Round your answers to 2 decimal places. Enter the smaller ...
July 9, 2013

College Algebra
A pharmaceutical salesperson receives a monthly salary of $2480 plus a commission of 7% of sales. Write a linear equation for the salesperson's monthly wage W in terms of sales S. W(S) =
July 5, 2013

Algebra
An executive flew in the corporate jet to a meeting in a city 1700 kilometers away. After traveling the same amount of time on the return flight, the pilot mentioned that they still had 300 kilometers to go. The air speed of the plane was 600 kilometers per hour. How fast was ...
July 1, 2013

chemistry
Using the equipment below, explain how to prepare a .00052 HCL solution farom a regent bottle containing .13 HCL using only the equipment below. Note, you may make multiple solutions but you are not allowed to combine columes. for example, if you need 2 mLs of a solution, you ...
June 24, 2013

maths
what's the value of A if cot^A(1 - 3 sec A + 2 sec^2 A)=1 and A>90 degrees.
June 18, 2013

urgent physics..
Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
June 18, 2013

urgent...maths
Find the sum of all primes p, such that p divides u(p), where u(p) is the p-th Fibonacci number. this iss very urgentt...
June 18, 2013

math
Find the sum of all primes p, such that p divides up, where up is the p- th Fibonacci number. please tell me the answer it's urgent about this..///
June 18, 2013

math
thanks i have now understood the problem.............
June 18, 2013

math
what's the sum of infinite terms?
June 18, 2013

math
S=1+2(1/5)+3(1/5)^2+4(1/5)^3…. If S=a/b, where a and b are co prime positive integers, what is the value of a+b?
June 18, 2013

math
If z=−√2/2+√2/2 i, what is the value of −(z^−52)? i is the imaginary unit where i^2=-1
June 18, 2013

math
A 999-digit number starts with 9. Every 2 consecutive digits is divisible by 17 or 23. There are 2 possibilities for the last 3 digits. What is the sum of these 2 possibilities?
June 18, 2013

math
Let α and β be the roots of 3x2+4x+9=0. Then (1+α)(1+β) can be expressed in the form ab, where a and b are coprime positive integers. Find a+b.
June 18, 2013

physics
Adventurous Mary tries a new game: she puts on her rollerblades and throws the ball towards the wall, lets it bounce off, catches it again, throws it right back, and so on. She notices a strange thing: after the second throw, she is unable to catch the ball anymore since the ...
June 18, 2013

physics
In a synchrotron, electrons are accelerated to speeds close to the speed of light v≈c≈3×108 m/s Suppose that in a synchrotron, 100 billion (1011) electrons move in a circular orbit of circumference L=300 m . Determine the electric current in Amps due the flow...
June 18, 2013

physics
apply formula v=u-gt v=0 u=14 g=10 then t=1.4s
June 17, 2013

physics
Potential = electric field intensity * distance 1.44=a*10 a=0.144
June 17, 2013

math
Find the sum of all primes p, such that p divides up, where up is the p-th Fibonacci number.
June 17, 2013

math
The real numbers x and y satisfy the nonlinear system of equations {2x^2 − 6xy + 2y^2+ 43x + 43y = 174 x^2 + y^2 + 5x + 5y = 30. Find the largest possible value of |xy|.
June 17, 2013

math
What is the sum of all possible positive integer values of n, such that n^2+19n+130 is a perfect square?
June 17, 2013

math
S=1+2(1/5)+3(1/5)^2+4(1/5)^3…. If S=a/b, where a and b are coprime positive integers, what is the value of a+b?
June 17, 2013

math
Let S(N) denote the digit sum of the integer N. As N ranges over all 3-digit positive numbers, what value of N would give the minimum of M=NS(N)?
June 17, 2013

math
Find the sum of the squares of the three solutions of the equation x^3+3x^2−7x+1=0.
June 17, 2013

math
Consider the function defined as f(x)=(x^2+2x+3)^2+4. As x ranges over all real values, what is the minimum value of f(x)?
June 17, 2013

math
ABCD is a square. Γ1 is a circle that circumscribes ABCD (i.e. Γ1 passes through points A,B,C and D). Γ2 is a circle that is inscribed in ABCD (i.e. Γ2 is tangential to sides AB,BC,CD and DA). If the area of Γ1 is 100, what is the area of Γ2?
June 17, 2013

math
In an urn, there are several colored balls, with equal numbers of each color. We add 14 balls which are all of the same new color, that is different from those in the urn. It is calculated that the probability of drawing , without replacement, two balls of the same color is ...
June 17, 2013

math
Let S={1,2,3,4,…,2013} and let n be the smallest positive integer such that the product of any n distinct elements in S is divisible by 2013. What are the last 3 digits of n?
June 17, 2013

math
Find the minimum possible value of 2cos4θ+8cos3θ+32cos2θ+56cosθ+100
June 17, 2013

math
If ABC is a triangle with AB=20,BC=22 and CA=24. Let D lie on BC such that AD is the angle bisector of ∠BAC. What is AD^2?
June 17, 2013

math
ABCD is a square. Γ1 is a circle that circumscribes ABCD (i.e. Γ1 passes through points A,B,C and D). Γ2 is a circle that is inscribed in ABCD (i.e. Γ2 is tangential to sides AB,BC,CD and DA). If the area of Γ1 is 100, what is the area of Γ2?
June 17, 2013

math
Suppose A,B,C,D, and E are distinct positive integers such that A<B<C<D<E, their median is 10 and their mean is 15. Find the maximum possible value of D.
June 17, 2013

math
Suppose A,B,C,D and E are distinct positive integers such that A < B < C < D < E,their median is 10 and their mean is 15.Find the maximum possible value of D.
June 17, 2013

calculus
find equation of tangent line for x^(1/3) + y^(1/2)=2 at point (1,1)
June 16, 2013

calculus
estimate ln(e^2+0.1)-ln(e^2)
June 16, 2013

calculus
estimate ln(e^2+0.1)-ln(e^2)
June 16, 2013

calculus
estimate change in f using the linear approximation and compute both error and the % error f(x)= (3+x)^1/2 a=1 change in x=0.5
June 16, 2013

algebra
karas custom tees experienced fixed costs of $200 and variable costs of $5 a shirt. Write an equation that can determine the total expenses encountered by kara custom tees . let x be number of shirts, c be cost of producing x shirts
June 16, 2013

calculus
estimate change in f using the linear approximation and compute both error and the % error f(x)= (3+x)^1/2 a=1 change in x=0.5
June 16, 2013

Physics
11 c) please!!!
June 15, 2013

Physics
11 c) Is the net charge positive or negative?
June 15, 2013

Physics
Is this correct for 10 d)= P=1/3T * int(-L*w*(Imax)^2*sin(wt)*cos(wt), 0 , 3T) Thanks!!!
June 15, 2013

Physics
10 d) Positive or negative?
June 15, 2013

Physics
(t*s^2)/(2*(PI^2)*b*(b^2-a^2))
June 15, 2013

Physics
11 c) please!
June 15, 2013

Physics
and 10 d), please
June 15, 2013

Physics
f= 1/(2*pi*sqrt(L*C))?
June 15, 2013

Physics
10 b) please!
June 15, 2013

Physics
10 b) 10 d) and 11 c) please!!!!
June 15, 2013

Physics
robbo 10 b)
June 15, 2013

Physics
robbo, the same that 9 a)
June 15, 2013

Physics
Please 11 c) and 10!
June 15, 2013

Physics
I think a b is missing! t*s^2/(2*PI^2*b*(b^2-a^2) )
June 15, 2013

Physics
8 f) Result of e multiplied by 2*pi*b*d
June 15, 2013

Physics
Please OVNI, 11 c)
June 15, 2013

Physics
BG, do you have 10 c and d?
June 15, 2013

Physics
BG, 8 d) B= mu_0*(r^2-a^2)*s/(2*r*pi*(b^2-a^2))
June 15, 2013

Physics
5 e) v= m*g*R/(B^2*W^2)
June 15, 2013

Physics
Hi BG, can you put the results for 8 a, b,c?
June 15, 2013

Physics
Please, problem 8!!!
June 15, 2013

Physics
Phy, do you have problem 8?
June 14, 2013

english
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June 8, 2013

algerbra
What is the median and the 1st or lower quartile of the following data: 4, 12, 15, 20, 24, 30, 32, 35
June 6, 2013

Algebra
The class average on a math test was 82 and there are 8 students in the class. If seven of the scores are 80, 90, 78, 100, 76, 74, and 82, what must the 8th score be to produce the average of 82?
June 6, 2013

physics
What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
June 4, 2013

Statistics
For the mean add them all up and divide by 6. For the median line them in order. Find the average of the middle two numbers
May 26, 2013

Calculus
P = 2L + 2W 150 = LW 150/L = W P = 2L + 300/L Can you finish from here?
May 26, 2013

algebra
x - 2.5 < or equal to 8
May 17, 2013

math
Start by arranging the numbers in order Plant 1 4 10 20 25 Since there are 4 numbers, the first quartile is 10 and the third quartile is 20. Find the difference = 10. Do the same for the rest of the plants and you will find the largest interquartile range.
May 17, 2013

Physics
From a height of 30.5 , a 1.45 bird dives (from rest) into a small fish tank containing 49.0 of water. What is the maximum rise in temperature of the water if the bird gives it all of its mechanical energy?
May 16, 2013

Philosophy
Anything is possible it must be possible that something is possible help you decide what is true help you know what to write about to correct wrong ideas ethos
May 15, 2013

math
how to describe a model that represents 3/3x4/4?
May 14, 2013

statistica
To find the range subtract the smallest value from the largest. 9.0 - 2.0
May 10, 2013

math
s = sundaes b = banana splits s = 4b shop sels 4 times as many sundaes as banana splits 3.60(s) +4.25(b) = 3730 replace s with 4b 3.60(4b) + 4.25(b) =3730 Solve for b and then find s from 4 times b.
May 3, 2013

chemistry
24 times 12.45 grams and then change your answer to kilograms by dividing by 1000
May 3, 2013

Statistic
at least 47
April 27, 2013

physic
3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell (d) the speed of ...
April 24, 2013

calculus
3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell (d) the speed of ...
April 24, 2013

6th grade Math
38kg 4g divide by 12
April 23, 2013

math
if it took jeff 14 minutes to drive 10 1/2 mile how long will it take him to travel 23 miles?
April 17, 2013

public speaking
Which of the following is NOT true about persuasive speaking compared to informative speaking?
April 17, 2013

statistics
LSAT test scores are normally distributed with a mean of 490 and a standard deviation of 110. Find the probability that a randomly chosen test-taker will score between 320 and 600. (Round your answer to four decimal places.)
April 16, 2013

Physics
A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a wall and rebounds with a velocity of 10 m/s. a) What is the ball's initial and final momentum? b) what is the impulse on the ball? c) Thje ball is in contact with the wall for .10 second. with what force ...
April 15, 2013

accounting
Hillsborough Co. has an available-for-sale investment in the bonds of Schuyler with a carrying (and fair) value of $90,220. Hillsborough determined that due to poor economic prospects for Schuyler, the bonds have decreased in value to $58,450. It is determined that this loss ...
April 14, 2013

Math ( Polynomial )
This time three questions - 1. If (x^2 - 1 ) is a factor of polynomial ax^4 + bx^3 + cx^2 + dx + e, show that a + c + e = b + d = 0. 2. Let R1 and R2 be the remainders when polynomials x^3 + 2x^2 - 5ax - 7 and x^ 3 + ax^2 - 12 x + 6 are divided by ( x + 1 ) and ( x - 2 ) ...
April 13, 2013

Math ( Polynomial )
This time three questions - 1. If (x^2 - 1 ) is a factor of polynomial ax^4 + bx^3 + cx^2 + dx + e, show that a + c + e = b + d = 0. 2. Let R1 and R2 be the remainders when polynomials x^3 + 2x^2 - 5ax - 7 and x^ 3 + ax^2 - 12 x + 6 are divided by ( x + 1 ) and ( x - 2 ) ...
April 13, 2013

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