# Posts by Leah

Total # Posts: 499

**Math**

The pressure, P (in lbs/ft2), in a pipe varies over time. Three times an hour, the pressure oscillates from a low of 88 to a high of 254 and then back to a low of 88. The pressure at t=0 is 88. Find a possible cosine formula for P=f(t), where t is time in minutes.

*November 2, 2014*

**Bio AP**

Where does a g-protein bind to a receptor cell and what is it's function?

*October 30, 2014*

**math**

An ostrich farmer wants to enclose a rectangular area and then divide it into 4 pens with fencing parallel to one side of the rectangle. There are 720 feet of fencing available to complete the job. What is the largest possible total area of the 4 pens?

*October 28, 2014*

**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*

**please check my english**

It's D B B D A D I just took it and I got a 4/6 >:( so Those are the correct answers ^^

*October 13, 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*

**MATH**

You are literally a life saver, thank you so so so so so so much!!

*May 11, 2014*

**MATH**

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*

**MATH**

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*

**MATH**

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*

**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*

**life orientation**

Yes this question

*March 12, 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**

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*

**connexus**

haha same

*January 20, 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*