Thursday
December 8, 2016

Posts by jeff

Total # Posts: 787

Math
Find the set of all z such that neither 2+z nor 2-z is in the interval (-1,1]. Express your answer as an interval or as a union of intervals.
November 28, 2016

science
determine the velocity of the truck if it starts from rest and accelerate at 2m/s² in 3.2s
November 16, 2016

Math
Find the distance between the x-intercept and the y-intercept of the graph of the equation 5x - 12y = 60.
November 6, 2016

Math
We need to make an open topped box with a square base and fixed volume of 8 cubic feet. The material for the base costs $ 6 per square foot and the material for the side costs $4 per square foot. Write a function for the cost as a function of the length and side of the base
October 25, 2016

Math
Joe has 18 mortals all the marbles are either black or gold there are four more gold marbles and black how many black marbles are there
October 25, 2016

math
he last time Nkechi was at school was on Saturday. She was first absent for four days before that. Today is Tuesday, 27th of September. When was Nkechi first absent? Give the day and date.
October 10, 2016

Math
22.01
September 20, 2016

geometery
In triangle​ ABC, the size of angle B is 55 times the size of angle​ A, and the size of angle C is 1111degrees° less than 44 times the size of angle A. Find the size of the angles.
September 12, 2016

geometery
A rectangle has a perimeter of 42 inches. The width of the rectangle is 3 inches less than 1/2 the length. What are the dimensions of this​ rectangle? Write your answer in the form​ "width, length
September 12, 2016

geometry
In triangle​ ABC, the size of angle B is 55 times the size of angle​ A, and the size of angle C is 1111degrees° less than 44 times the size of angle A. Find the size of the angles. thank you
September 12, 2016

geometry
A rectangle has a perimeter of 4242 inches. The width of the rectangle is 33 inches less than one half 1/2 the length. What are the dimensions of this​ rectangle? Write your answer in the form​ "width, length thank you
September 12, 2016

math
Wilcorp has 50 employees who work 40 hours a week and earn $20/hour. Fifteen employees each worked 4 hours of overtime at 50% above their hourly rate.
September 12, 2016

math
There are 21 students in 6M. 12 students play football, 16 students play cricket and there are 2 students who don't play either sport. How many play both sports?
August 17, 2016

math
there are 91 students that attend mass .this represents 70% of the students. how many students at mass
July 24, 2016

Precalculus
An item costs $12.00 in 2016 through an online retailer. Each year, the price will increase by 5% of the previous year’s price. A. Find the general rule for the sequence of the prices for this item. B. Determine what the price will be in 2030. C. If you buy one of these ...
July 1, 2016

Math
At the Cafe, a lunch of iced tea, a veggie burger, and fries costs $7.56, with the fries costing twice as much as the iced tea. Next week at the Cafe, the price of the iced tea will increase 10% and the price of the veggie burger will increase 25%. After the increase, the same...
June 19, 2016

match
If a lateral line ditch will store 800 gallons of water how long will it take for one inch of water to be absorbed?
June 2, 2016

Math-Calc
f(x)=7/(ln(x^2+5)) find f'(1) Cant seem to be getting the right answer. I believe can I get help finding the derivative.... thank you
June 1, 2016

physics
do your own homework
April 21, 2016

life orientation
advice the cyclists about the road eccidents
April 21, 2016

Chemistry
Why is the equivalence point pH of the HCl-TRIS titration = 4.6?
April 8, 2016

Chemisty
Based on the standard analytical practice during a titration of taking pH-volume measurements every 0.3 pH units, how many measurements should you take between the addition of 5mL and 7.5mL of titrant, a) in the titration of a 10mL aliquot of standard 0.1500M TRIS base (Kb=1....
April 8, 2016

math
89m
March 31, 2016

Physics
A 3.0cm diameter crankshaft that is rotating at 2500 rpm comesto a halt in 1.5 s. a- what is the tangential acceleration of a ponit on thesurface? b-how many revolutions does the crankshaft make as itstops? For this question, what are the applicable concepts and/or laws and ...
March 31, 2016

Math
Determine the most probable next term in the following list of numbers. 1, 7, 1, 1, 7, 1, 1, 1, 7, 1, 1, 1, 1, 7, 1, 1, 1, 1 The most probable next term is______
March 9, 2016

Physics
A wire is made of a material with a resistivity of 2.08184 × 10−8 Ω · m . It has length 4.42917 m and diameter 0.6763 mm . What is the resistance of the wire? Answer in units of Ω. Would you just use the equation R = PL /a?
March 8, 2016

CHEMISTRY HELP
If a/b = 10.23, what is a and what is b?
February 19, 2016

CHEMISTRY
Hi DrBob222, can you explain what you mean by "Solve the two equation simultaneously for a and b. I get something like 2 for acid and 23 for base." I don't know how you got that and what you started with. Thanks!
February 18, 2016

CHEMISTRY
1. What is 5/60? 2. How did you get 10.3 for b/a?
February 18, 2016

CHEMISTRY
Calculate the amount (in mL) of 1.520M NaOH that is required to add the following acetic acid solution to prepare a buffer with the corresponding pH: 30.00mL of a 5.00% (w/v%) acetic acid; the resulting acetate buffer has a pH of 5.75. pKa of acetic acid = 4.74
February 18, 2016

physics
A disc has a mass of 340kg, and is mounted to a frictionless axle and is free to rotate around it. Model the shape of the disc as a hollow shaft on axis where the inner and outer diameters are 600mm and 1200mm respectively. A wire is wrapped around the disk, and is the pulled ...
February 6, 2016

Physics
An arrow is shot from a height of 1.5 m toward a cliff of height . It is shot with a velocity of 30 m/s at an angle of 60 deg above the horizontal. It lands on the top edge of the cliff 4.0 s later. (a) What is the height of the cliff? (b) What is the maximum height reached by...
January 31, 2016

Algebra
Im to write a function,that showsthe total cost of b(x) to rent a car driven (x)miles
January 21, 2016

Physics
A gun is fired vertically into a 1.60 kg block of wood at rest directly above it. If the bullet has a mass of 21.0 g and a speed of 195 m/s, how high will the block rise into the air after the bullet becomes embedded in it?
January 20, 2016

math
how to break down 2 1/3-1 3/4
January 19, 2016

Physics
A 0.500 kg object is thrown vertically upward with an average applied force of 8.20 N by a student. The force is applied through a displacement of 1.50m. a. What is the average net force acting on the object? b. What is the velocity of the object when it leaves the student'...
January 13, 2016

Math
Yes, you are correct. 1 gal is 4 qts, so 300 gals = 1200 qts. So 600 qts is 50% of 1200 qts.
January 10, 2016

probability
There are 4 white socks and 4 black socks. You randomly divides socks into pairs. What is the probability that each pair consists of 2 socks of the same colour? Express answer as a fraction. I'm not really sure how to start this question.
December 30, 2015

probability
A jar has 25 red, 15 blue and 10 green marbles. Drawing 3 marbles all at once what is the probability of drawing 2 red and 1 blue? 2 red? Not sure if this is right. For the fist problem I multiplied (25/50)*(24/49)*(15/48)=.0765 and for the next problem I multiply (25/50)*(24/...
December 9, 2015

probability
A jar has 25 red, 15 blue and 10 green marbles. Drawing 3 marbles all at once what is the probability of drawing 2 red and 1 blue? 2 red? Not sure if this is right. For the fist problem I multiplied (25/50)*(24/49)*(15/48)=.0765 and for the next problem I multiply (25/50)*(24/...
December 9, 2015

College Physics
How much energy is required to bring 10.0 grams of ice at -5.00 degrees to 105-degree steam? Assume the system is isolated so that no mass is lost to the surroundings
December 8, 2015

chem
what are ways to increase the solubility of SnF2 at constant temperature and pressure. I think adding a strong acid will work not sure what else.
December 8, 2015

Math
A Ferris wheel has a radius of 30 feet and travels 3.6 feet every second. How long does it take for the Ferris wheel to complete one revolution?
December 1, 2015

Social Studies
philadelphia
November 23, 2015

math
Deez nuts goes in the banana factory please liek dis i want attention
November 16, 2015

Math
A manufacture has been selling 1400 television sets a week at $450 each. A market survey indicates that for each $14 rebate offered to a buyer, the number of sets sold will increase by 140 per week. a) Find the function representing the demand p(x) , where x is the number of ...
November 12, 2015

Math
The blood vascular system consists of blood vessels (arteries, arterioles, capillaries, and veins) that convey blood from the heart to the organs and back to the heart. This system should work so as to minimize the energy expended by the heart in pumping the blood. In ...
November 12, 2015

Math
A street light is at the top of a 16 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path. How fast is the tip of her shadow moving along the ground when she is 30 ft from the base of the pole? How fast is the length of her ...
November 12, 2015

chem
Idk what the answer is does anyone know
November 11, 2015

Alegebra
I need some help just setting up an equation for this problem, I cannot figure it out. One train travels from A to B at 19mph. A second train travels from B to A at 21 mph. One hour before the trains pass each other, how far apart are they?
November 11, 2015

Organic Chemistry
How am I supposed to do these questions? I'm completely lost. A 0.120 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.12° in a 1-dm sample container. The molar mass of the compound is 130.0 g/mol. (b) What is the observed rotation...
November 8, 2015

chemistry
Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI. Include phases. What mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.290 M NaI? Assume the reaction goes to completion.
October 10, 2015

math
**** her in the *****
October 6, 2015

Math
3:30
September 27, 2015

Physics help!!
A plane is flying horizontally at constant speed, vo. when it releases a package. The package lands on the ground at t seconds later. Just before the package lands... a. What is its horizontal component of velocity? Leave in terms of vo and t. b. What is its vertical component...
September 25, 2015

Chemistry
.0000625
September 25, 2015

Math
If I have a random stack of 5 quarters, the 1st 3 quarters are heads. What is the probability the the 4th quarter would be another head What is the probability the the 4th quarter would be a tail Is there a way to show the probability or odds that you would continue to keep ...
September 23, 2015

math
this is hard
September 20, 2015

english
compare and contrast the words maneuver and manipulate
September 20, 2015

Physics
Thank you, but it did actually say meters haha
September 18, 2015

Physics
Two airplanes leave an airport at the same time. The velocity of the first airplane is 730 m/h at a heading of 44.6 degrees. The velocity of the second is 610 m/h at a heading of 100 degrees. How far apart are they after 2.3 h? Answer in units of m.
September 18, 2015

Math
9+10=21
September 9, 2015

Physics
A model rocket is launched from rest with an upward acceleration of 6.30 m/s2 and, due to a strong wind, a horizontal acceleration of 1.50 m/s2. How far is the rocket from the launch pad 5.30 s later when the rocket engine runs out of fuel?
September 9, 2015

Culler middle school
-4*3=
August 30, 2015

language arts
I guess just foods that are good for you
August 16, 2015

language arts
what are some examples of benign foods
August 16, 2015

ENGLISH
2)Writing 3)Checking for mistakes 4)revising
July 7, 2015

statistics
0.36
June 30, 2015

algebra
Susan is on her way home in her car. She has driven 24 miles so far, which is one-half of the way home. What is the total length of her drive?
June 29, 2015

Algebra
1 year
April 29, 2015

Biology
What is osmosis
April 27, 2015

Further maths
Show graphically the solution sets of the following inequalities: (a) X square - 7 * h2 > 0 (b) 3X square - 5X - 2 > 0
April 27, 2015

Physics
A 250kg car initially at rest was travelling with acceleration of 10m/s square. Calculate the kinetic energy after 3 seconds
April 27, 2015

calculus check
Find the limit as x approaches 3 of [(2x^3-5x^2+7)/(3sin(xpi/6)-cos(xpi))] When I plugged in 3, I got 4.
April 26, 2015

math
Raymond has four more sisters than Tyler.Write a number sentence to show Raymond=r tyler=t
April 26, 2015

calculus
If f(x)=the integral of (3x^2+2x+4) dx, find C if f(1)=10.
April 26, 2015

physics
A charge of -4.50 10-6 C is placed at a point in space where the electric field is directed toward the right and has a magnitude of 9.00 104 N/C. What are the magnitude and direction of the electrostatic force on this charge?
April 23, 2015

Physics
Two disks are originally separated. The mass of Disk #1 is 1.5 kg, and the mass of disk #2 is 2.6 kg. Disk #1 has a radius of 10 cm, and it is rotating at an angular velocity of 15.0 rad/sec. Disk #2 has a radius of 15 cm, and it rotates in the opposite direction at an angular...
April 6, 2015

physics
2. On the spin cycle on a washing machine, the drum holding the clothes goes from zero to 180 rpm (revolutions per minute) in 8.0 seconds. (Hint: Be sure to change rpm to radians/sec.) (a) What is the angular acceleration (in radians/sec2) during this time period? (b) How many...
April 6, 2015

math
3 times 2 and 2/5
March 21, 2015

chemistry
net ionic equation for reaction between copper carbonate and the hydroiodic acid
March 21, 2015

Algebra
HI can you please help this is the only question I cant figure out :) Graph the linear function y = 1/3x - 4 1/3 is one third :)
March 17, 2015

Algebra
What are the first four terms of an arithmetic sequence if the common difference is 1.5 and the first term is 15? 15,30,45,60 15,16.5,18,19.5 15,22.5,33.75,50.625 none of the above What are the first four terms of a geometric sequence if the common ratio is 10 and the first ...
March 9, 2015

math
A spring is attached to the ceiling and pulled 12 cm down from equilibrium and released. The amplitude decreases by 17% each second. The spring oscillates 16 times each second. Find an equation for the distance, D the end of the spring is below equilibrium in terms of seconds, t.
March 1, 2015

Algebra II
Let 1990 be 1, 1991 be 2, 1992 be 3, and 1994 be 4 3885=10(3^3)+115(3^2)+25(3)+2505 3885= 270 + 1035 + 75 +2505 3885=3885 1992 is the answer
March 1, 2015

math
I multiplied my number by 102,then subtracted 228. I then divided by 6.Finally I added 51. My result was 200. What number was I thinking of ?
February 22, 2015

bioilogy
Discuss possible benefits and drawbacks of a transgenic organism such as Bt corn?
February 12, 2015

math
use these 5 digits to make 24 0-1-2-3-4 Use each digit only once. record how you made 24
February 8, 2015

math
use an array to explain how you can solve 15 x 6 using facts that you already know
February 7, 2015

Chemistry
Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
February 4, 2015

Algebra
If x is the length and y is the width of a rectangle, find and graph all integer pairs(x,y) that create a rectangle with a perimeter of 12 cm.
January 26, 2015

business math
The French company has a beginning inventory of $77,000 and an ending inventory of $80,000. sales were $280,000. assume French's markup rate on the selling price 40%. based on the selling price what is the inventory turnover at cost. please explain?
January 23, 2015

physics
The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 50t - 2t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
January 22, 2015

calculus
The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 50t - 2t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?
January 22, 2015

Math/physics
Steve??? Can you help me?
January 16, 2015

Math/physics
This is my last problem. Please help! A motorcycle rider starts out on top of a ramp 10 m high and then rides down and jumps the motorcycle when he comes to the end of the ramp (like evil knivel). The rider is at the peak of his jump at 5 m. How fast is the motorcycle going ...
January 16, 2015

Math
Thank you, Steve!
January 15, 2015

Math
Can someone please help me set this up. I didn't quite understand how to do this today. Before leaving Earth, the mass of an astronaut is measured to be 60kg. The astronaut lands on the Moon and measures the acceleration of gravity to be 1.6 m/s2(squared). What would the ...
January 15, 2015

Math
17 over 20 is your answer. 85 over 100 which is 85% is divisible by 5. So, you answered 17 out of 20 questions correctly.
January 13, 2015

Math - Ratio
A map scale is 1:10,000. Find the actual distance in centimetres represented on a map by 5cm. Convert your answer to metres and kilometres.
January 13, 2015

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