Saturday
October 25, 2014

Posts by leah


Total # Posts: 388

math
Find the critical numbers of the function f(x) = x^{1/4}-x^{-3/4}.
October 25, 2014

math
Find the critical numbers for f=5+10x-x^{2} in the interval [-3,3].Also find the minimum and maximum.
October 20, 2014

Science (Physics)
I need help with these. I'm so confused! Thanks! 1.) An F-14 Tomcat fighter jet goes from rest to a speed of 75m/s in 2.5 s. What is the acceleration? 2.) Preston tossed a red ball upward and it reaches a maximum height of 3.0m What is the final velocity when it returns to...
October 16, 2014

Math
32x+36y+16=0 36x+32y+16=0 Find x and y
October 15, 2014

Math
A projectile is shot upward from the earth with an initial velocity of 320 ft/sec. (a) What is the velocity after 5 secs.? ft/sec. (b) What is the acceleration after 3 secs.? ft/sec^2.
October 7, 2014

Math
For this problem, a person standing on the edge of a cliff throws a rock directly upward. it is observed that 2 secs later the rock is at its maximum height (in feet) and that 5 secs after that (meaning 7 seconds after being thrown) the rock hits the ground at the base of the ...
October 7, 2014

Math
If a ball is thrown vertically upward from the roof of 48 foot building with a velocity of 80 ft/sec, its height after t seconds is s(t) = 48+80t-16t^2 What is the velocity of the ball when it hits the ground?
October 7, 2014

Math
Assume that f is a continuous function from the real numbers to the real numbers such that for all numbers x,y, and a it is true that f(x+y)=f(x) + f(y) and that f(ax)=af(x). Further assume that f(1) = pi. Find f'(-1). Please explain your reasoning. I am so confused. Ive ...
October 6, 2014

Math
A street light is at the top of a 17 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 when she is 30 ft from the base of the pole? Must be accurate to fifth decimal place. I have ...
October 5, 2014

Math
WebWorks will not take the answer.
October 5, 2014

Math
A spherical balloon is to be deflated so that its radius decreases at a constant rate of 12 cm/min. At what rate must air be removed when the radius is 5 cm? Must be accurate to the 5th decimal place. It seems like an easy question but no matter how many times i attempt it I ...
October 5, 2014

Math
Water is leaking out of an inverted conical tank at a rate of 0.0109 {\rm m}^3{\rm /min}. At the same time water is being pumped into the tank at a constant rate. The tank has height 9 meters and the diameter at the top is 4.5 meters. If the water level is rising at a rate of ...
October 5, 2014

Chemistry
I'm really confused about how to do these two problems. Please help me. What is the amount of heat (kJ) required if 64.0 kg of H2O is heated from 25°C to 85°C? 200.0 g Al (C = 0.900 J/g × °C) at 95°C is added to 85.4 g H2O at 25°C. What is the ...
September 25, 2014

health
Visiting your doctor for regular check-ups is an example of which step you might take to meet take to meet your health goals? A. gain awareness. (B). gain knowledge. C. build health skill. D. set goals.
September 10, 2014

Grammar
Many stories about the first Valentine's Day exist.. What is the simple subject?
September 3, 2014

Grammar
Valentines Day
September 3, 2014

Grammar
Valentines Day has an interesting history? What is the simple subject?
September 3, 2014

reading
because i am writing a poem and i need a different word
August 19, 2014

reading
what is another word for things?
August 19, 2014

science
thanks
August 19, 2014

science
oh ok sorry did not see that
August 19, 2014

science
please someone help
August 19, 2014

science
can you please help me find 3 good science experiment? for the science fair....
August 19, 2014

Social Studies
thank you so so so much...
August 18, 2014

Social Studies
???? please answer i need to finish my hw
August 18, 2014

Social Studies
ya what were the years
August 18, 2014

Social Studies
please can someone help me
August 18, 2014

Social Studies
what year were england and romans invaded?
August 18, 2014

math
Finance charge was 5.58 on a monthly balance of 318.76. What is the rate?
August 13, 2014

college chem
You are instructed to create 400. mL of a 0.40 M phosphate buffer with a pH of 6.9. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow ...
June 23, 2014

Physics
a 40kg girl and a 30kg boy face each other on friction free roller skates. the boy pushes the girl,
May 19, 2014

chemistry
The complete combustion of propane, C3H8(g), is represented by the equation: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) ΔH° = -2220 kJ How much&...
May 14, 2014

MATHHH
You are literally a life saver, thank you so so so so so so much!!
May 11, 2014

MATHHH
A hockey game is preparing for a group photo. The team has 1 goalie, 4 defense, and 7 forwards. The photographer wants two rows of six players. How many ways can the team arrange six players in the front row with at most 2 defense?
May 11, 2014

MATHHH
A conveyor belt sushi restaurant lets you choose what you want to eat from variously-coloured plates that go by. You pay based on the colours of the plates. After dinner, 1 green plate, 4 yellow plates, and 2 blue plates. Use the Fundamental Counting Principle to count how ...
May 10, 2014

MATHHH
A paper bag contains a mixture of three types of treats: 12 granola bars, 10 fruit bars, and 8 cheese strips. Suppose that you play a game in which a treat is randomly taken from the bag and replaced, and then a second treat is drawn from the bag. You are allowed to keep the ...
May 10, 2014

Math 12
In Lotto 649, find the probability that: a) You have all six correct numbers. b) You have three correct numbers.
May 7, 2014

Math 12
A bag contains 5 red, 3 green, and 6 marbles. If a child grabs three marbles, find P(at least 2 blue marbles).
May 7, 2014

Math 12
Wait, how'd you get 33320 in A?
May 7, 2014

Math 12
Ohhhhhhh! okay, thank you! :)
May 7, 2014

Math 12
is C for nCr???? i'm a little confused
May 7, 2014

Math 12
Five cards are dealt from a shuffled deck of 52. Find the probability that: a) The hand has 3 spades and 2 hearts. b) The hand has 2 aces, 2 kings, and one other card.
May 7, 2014

Math 12
Thank you!!!!!!!
May 7, 2014

Math 12
One hundred tickets are sold for a raffle. Three prizes are awarded. What is the probability that Andy wins first prize, Brianna wins second, and Cam wins third? What is the probability that Andy, Brianna, and Cam are the three winners (not necessarily in that order)?
May 7, 2014

BIOLOGY 12
Explain the path of deoxygenated blood from the right atrium to the lungs
April 16, 2014

Math
6
March 25, 2014

chemistry
The pressure in an automobile tire is 1.85 atm at 27.0°C. What will be the pressure if the temperature increases to 38.0°C?
March 20, 2014

Math
A company replaces their cars every 6 years. A car is worth $13520 after 2 years. The company uses a depreciation rate of 35% a year. a) How much will the car be worth when the company replaces it? b) How much did the car cost when it was purchased?
March 9, 2014

Foundations Math 12
Mark wants to buy a car in 15 months, when he graduates. He estimates the car he wants will cost $12 500. Mark has just invested $7500 in a GIC earning 4% compounded quarterly. He also has a savings account that earns 2.45%, compounded monthly. How much should he deposit in ...
February 18, 2014

Foundations Math 12
Thanks Steve!!!
February 16, 2014

Foundations Math 12
48 weeks ago, Gabriella invested at 3.9% interest, compounded weekly. Today, her investment is worth $225.50. How much interest has Gabriella's account earned in the past 48 weeks?
February 16, 2014

Foundations Math 12
thank you so much! :)
February 16, 2014

Foundations Math 12
Jie is investing $15000 and is choosing between two options. With Option A, the investment is compounded semi-annually and will grow to $20000 in 5 years. With Option B, the investment is compounded monthly for 5 years. The annual rate of interest is the same in both options. ...
February 16, 2014

Foundations Math 12
Forty eight weeks ago, Gabriella invested money at 3.9% interest, compounded weekly. Today, her investment is worth $225.50. How much interest has Gabriella's account earned in the past 48 weeks?
February 16, 2014

Foundations Math 12
Thank you!
February 16, 2014

Foundations Math 12
Bathsheba is saving up for the down payment on a farm. She invests $30000 at 5.2% interest, compounded quarterly, for 4 years. To the nearest tenth of a percent, Bathsheba's rate of return will be ____%.
February 16, 2014

Foundations Math 12
Thanks Henry!
February 16, 2014

Foundations Math 12
Kelly is planning to renovate her house. She intends to spend $200000. She invests $150000 in an account at 5.3% interest, compounded monthly. It will take Kelly ____ years to meet her goal, to the nearest tenth of a year.
February 16, 2014

Foundations Math 12
Determine the term of a $46000 investment with an interest rate of 3.9%, compounded monthly, if the future value is $100000. Round your answer to the nearest year. - I know I use the rule of 72 but what do you do after that?
February 16, 2014

math
9
February 11, 2014

math
If a gardener has 2.625 pounds of soil and divides it into bags with equal amounts, how much soil would be in each bag?
February 11, 2014

Math
Ahhhh, okay I see what to do now. Thank you, Ms.Sue!
December 7, 2013

Math
An appliance is on sale at 30% discount. If the sale price is $42.00, what was the original price of the appliance?
December 7, 2013

Math
What would the equation look like when the line is parallel to x-y+1=0 and has a Y-intercept of 3/4
November 20, 2013

Math
What would the equation look like when the line is parallel to x=3y-2 and has a Y-intercept of -3/2
November 20, 2013

Math
What would the equation look like when the line is parallel to 2x-3y=1 and has a Y-intercept of 0
November 20, 2013

Math
What would the equation look like when the line is parallel to y= -x+1/2 and has a Y-intercept of -2
November 20, 2013

Math
What would the equation look like when the line is parallel to y= 3/4x-3 and has a Y-intercept of 3
November 20, 2013

Math
What would the equation look like when the line is parallel to y=-2x+3 and has a Y-intercept of -1
November 20, 2013

Math
What would the equation look like when the line is perpendicular to 2x-3=4y and has Y- intercept of -5/4
November 20, 2013

Math
What would the equation look like when the line is perpendicular to 2x-3y+1=0 and has Y- intercept of 2/3
November 20, 2013

Math
What would the equation look like when the line is perpendicular to x+2y=10 and has a y-intercept of -10
November 20, 2013

Math
What is the equation look like when the line is perpendicular to y= 4-3x and has y intercept of 3/4?
November 20, 2013

Math
What would the equation look like if the line is perpendicular to y=x+2 and has a y-intercept of 0?
November 20, 2013

Algebra
How did you .1x? and where did the 3600 come from?
November 10, 2013

Algebra
Show all steps and Find the maximum revenue for the revenue function R(x)= 360x - 0.05x^2
November 10, 2013

Math
Determine whether each verbal description represents a linear function or not. Correct me if I'm wrong on any of these!! 6.The price for x pounds of cheese at $6.99 per pound (LINEAR FUNCTION) 7. A car accelerating on the highway to reach a speed of 62 mph then slowing ...
October 30, 2013

Math
Determine whether each verbal description represents a linear function or not. Correct me if I'm wrong on any of these!! 1. Jova walks quickly for 25 minutes then she rests for 5 minutes before continuing on for another 10 minutes. (NOT A LINEAR FUNCTION) 2 A rock that is ...
October 30, 2013

Math
Determine whether each verbal description represents a linear function or not. Correct me if I'm wrong on any of these!! 6.The price for x pounds of cheese at $6.99 per pound (LINEAR FUNCTION) 7. A car accelerating on the highway to reach a speed of 62 mph then slowing ...
October 30, 2013

Math
Determine whether each verbal description represents a linear function or not. Correct me if I'm wrong on any of these!! 1. Jova walks quickly for 25 minutes then she rests for 5 minutes before continuing on for another 10 minutes. (NOT A LINEAR FUNCTION) 2 A rock that is ...
October 30, 2013

pritchett
what does D.A.R mean in S.S need to know ASAP
October 21, 2013

English
Which Anology would go best with this one? Pond:lake:: A. man:child B. water:sream C. lake:sea D. dusk:night
October 13, 2013

English
Which analogy would best go with this one? branch:tree:: A. flower:garden B. teo:three C. tentacle:octopus D. near:far
October 13, 2013

math
Sally and Marta had the same number of postcards. After Sally sold 18 of her postcards, Marta had 4 times as many postcards as Sally. How many postcards did each girl have to begin with?
October 1, 2013

Math
How would you solve this word problem in one variable inequality form? One cell phone company offers a plan that costs $29.99 and includes unlimited night and weekend minutes. Another company offers a plan that costs $19.99 and charges 35 cents per minute during nights ...
September 25, 2013

accounting
A recent cash budget showed estimated cash receipts of $159,000, estimated cash disbursements of $155,000, and a desired ending cash balance of $6,000, with no borrowing of funds. The beginning cash balance was:
September 19, 2013

physics
7.42m
September 1, 2013

Math
How much is $20,000 compounded annually at 6% for 35 years? Thank you. Please show solution
August 2, 2013

Math-Hooke's law
Using Hooke's Law (F=kx) determine: A) A weight of 5 pounds stretches a certain spring from its natural length of 10.2 inches to a length of 10.5 inches. Find K. B) What weight will stretch the spring in part (A) to a length of 13.2 inches? Thank you!
July 16, 2013

Statistics
There were two independent groups who took a school course by different modes. The first sample of students took the course in the online and the second sample took the course in the conventional face to face mode. Using the sample data determine if there is significant ...
June 22, 2013

Physics
Suppose the block is released from rest with the spring compressed 5.50 cm. The mass of the block is 1.60 kg and the force constant of the spring is 965 N/m . Assume the surface is frictionless. A) What is the speed of the block when the spring expands to a compression of only...
May 26, 2013

D/dt
Thank you for the equation and the useful article. :) So this is what I get. f(t) dt= 2(0)- [sqrt(t^2+1) * 2t] f(t) dt= -sqrt(t^2+1) *2t Is this correct? Thank you so much. :-)
May 15, 2013

D/dt
Calculate d/dt when a=t^2, b=2 and sqrt(x+1)dx. My answer turns out to be incorrect despite my checking it several times. I got -2/3t* sqrt(t^2+1) Can someone explain to me what is wrong with my answer and how to go about obtaining it the right way? Thank you everyone. :-)
May 15, 2013

Language Arts
Which sentence below has a missing antecedent? A Many people are planning to attend the race, so we should get to the park early. B My parents are both swimmers, so I know a lot about it. C When Steven and Patrick went to the movies, he bought the tickets. Is it B??
May 2, 2013

LIFE ORIENTATION
identify and describe 3 environmental health hazard that cause ill health within your community and include evidence that is current if the identified issues.use graphs ,statistics, pictures
April 24, 2013

Math
Stuart needed to purchase cleaning supplies for his company. He purchased 15 rolls of paper towels for $0.65 each, 15 bottles of cleaning solution for $1.25 each, 4 containers of garbage bags for $2.45 each and 3 new mops for $6.98 each. He received a 15% discount using his ...
April 20, 2013

MATH
30
April 18, 2013

Chemistry
Figured it out, it is 11. :)
April 14, 2013

Chemistry
If the Kb of a weak base is 1.5 × 10^-6, what is the pH of a 0.25 M solution of this base? I found that I need to use the quadratic equation but I'm having difficulties because I come up with taking the square root by zero and that isn't right. Please help! a=1, ...
April 14, 2013

MATH
THE AREA OF A RECTANGUALR GARDEN IS 240 SQ FT. IF THE LENGTH OF THE GARDEN IS 20 FT.,WHAT IS ITS WIDTH?
April 10, 2013

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