Monday

February 20, 2017
Total # Posts: 5,132

**linear algebra**

Solve using the concept of rank. Is S={−16 −7 −21,2 1 3, 21 9 2} a linearly independent set of vectors in R3? So I know how to find out if this set is linearly indep. But, I don't know how to use row rank to find this out..

*March 23, 2015*

**math**

thank you

*March 23, 2015*

**math**

Tim sells sneakers. He receives $9.75 an hour and 3% commission on sales. One week he works 24 hours and his sales total $1,879.95. What are his total earnings for the week ? Please help

*March 23, 2015*

**science**

is it corrrectr

*March 21, 2015*

**science**

i think its a

*March 21, 2015*

**science**

At 3:15 one afternoon, the temperature over the land reaches its highest value for the day — about 89°F. The temperature over the adjacent water is about 72°F. What would the expected weather conditions be at this time? A. Cloudy skies and a sea breeze B. Clear ...

*March 21, 2015*

**Pre-Algebra**

Equation S: y = x + 9 Equation T: y = 2x + 1 Which of the following steps can be used to find the solution to the set of equations? x = 2x + 1 x + 9 = 2x x + 1 = 2x + 9 x + 9 = 2x + 1

*March 20, 2015*

**Math**

Zain goes swimming. He swims the first length of the pool in 2.5 minutes. The time he takes to swim each length is 10 seconds more than he took to swim the previous length. A. Find the time Zain takes to swim the fifth length. B. Find the time taken for Zain to swim a total of...

*March 19, 2015*

**Math**

A ball is dropped vertically. It reaches a height of 1.6m on the first bounce. The height of each subsequent bounce is 80% of the previous bounce. A. Find the height the ball reaches on the 6th bounce. B. Find the sum of the first seven terms of this sequence.

*March 19, 2015*

**life orientation**

Referee

*March 19, 2015*

**chemistry**

2 NH3 (g) ----> N2 9g) + 3 H2 (g) at equilibrium, [NH3] = 0.0227 M, [N2] = 0.119 M, and [H2] = 0.346 M. Calculate Kc for the reaaction at this temperature

*March 17, 2015*

**computer applications**

John wants to see the formulas he has used in his spreadsheet but he does not want to see the results of the formulas. How does he display his formulas? A. Click on Trace Precedents. B. Click Print Formulas. C. Click on Show Formulas. D. Click Evaluate Formulas from reading my...

*March 16, 2015*

**Physics**

Oops, c should be when cos(kx) = 0, work it out from there.

*March 14, 2015*

**Physics**

a), Just pop 0 into the equation, what are you left with? b) ω is 2pi/T, so pop that into the equation. c) ?? Not sure. I think it's whenever Sin(wt) = 0, so 0, pi, 2pi, 3pi etc. But I think wavelenth is 2pi, so 1/2, 1, 3/2 might be the answer.

*March 14, 2015*

**Maths**

Suppose that the reliability of a HIV test is specified as follows: Of people having HIV, 90% of the test detect the disease but 10% go undetected. Of people free of HIV, 99% of the test are judged HIV–ive but 1% are diagnosed as showing HIV+ive. From a large population ...

*March 14, 2015*

**math**

Robert is replacing sod in two square-shaped areas of his backyard. One side of the first area is 7.5 feet. One side of the other area is 5.7 feet. The sod costs 'y' dollars per square foot. A)Write an expression to show how much Robert will spend on sod. B)If the sod ...

*March 10, 2015*

**math**

In each of the following, relationships among marked angles are given below the figure. Find the measures of the marked angles. b. m(∠AOB ) is 30° less than 2m (∠BOC ) c. m(∠AOB ) – m(∠BOC ) = 50

*March 9, 2015*

**Math**

A flower planter is to be made from landscape ties that are 4 feet long, four inches high and six inches wide. Each planter is 4 ties high. Describe how to build the planters so that they are square

*March 9, 2015*

**Math Ms.Sue**

For the 2nd one, its c.

*March 7, 2015*

**statistics**

In the population, the average IQ is μ = 100 with a standard deviation of σ = 15. A team of scientists wants to test a new medication to see if it has a positive effect on intelligence. A sample of n = 10 participants who have taken the medication has a mean of M = ...

*March 7, 2015*

**Physics**

mass is grams, so 0.016 .. pop that in your formula and you're golden

*March 5, 2015*

**earth**

what is 15 times 12

*March 4, 2015*

**math**

Tony plans to install a window pane that has a length of 8 inches and a width of 6 inches. He decides that the length has to be reduced by z inches. He says that the new area of the window pane will be 48−z. Is Tony correct? Why or why not? THANK YOU!!!!!

*March 3, 2015*

**math**

Janice plans to build a rectangular table top with an area of 60+20r square inches. The width of the table top is 10 inches. What is the length of the table top?. THANK YOU

*March 3, 2015*

**Algebra 2**

Simplify each sum or difference. State any restrictions on the variable. -3x/x^2-9+4/2x-6

*March 3, 2015*

**physic**

Question Part Points Submissions Used A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.88 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A ...

*March 3, 2015*

**physics**

NEEDS HELP PLEASE!! A 100kg shot putter is putting a shot 4kg. Just before he releases the shot, he is in the air (feet are off the ground). At this instant, the only force he exerts against the shot is an 800N horizontal force directed forward. a-what is his horizontal ...

*March 2, 2015*

**math**

Scale factor of 0.5 inches = 1.5 feet

*March 2, 2015*

**linear**

^ it is an augmented matrix, sorry the formatting is bad.

*March 2, 2015*

**linear**

Is the set S = {v1, v2, . . . , vk} linearly independent? 1 0 2 −2 0 1 0 0 1 0 −1 −1 2 0 0 0 −1 2 1 0

*March 2, 2015*

**Ratio**

The ratio of cats to dogs at the shelter is 3 to 2. If there are 16 cats at the shelter, how many dogs are there?

*March 2, 2015*

**S.S**

B, im 110% sure

*March 2, 2015*

**Science**

100% I agree

*March 2, 2015*

**science**

The answers are ABCB

*March 2, 2015*

**Statistics**

How does the standard deviation differ to of the sample mean x bar. Please help I'm confused

*March 2, 2015*

**linear algebra**

^ that is an augmented matrix by the way. with <0,0,0,0> being the vector added

*February 28, 2015*

**linear algebra**

1 0 2 −2 0 1 0 0 1 0 −1 −1 2 0 0 0 −1 2 1 0 Is the set S = {v1, v2, . . . , vk} linearly independent?

*February 28, 2015*

**Problem Solving**

If I understand correctly the money he can spread is meant to be the money he can spend? so all you have to do is take 5% of the money he earned. so .05*x = y where x is total money earned and y is money able to spend

*February 28, 2015*

**math**

Write and solve an equation to find the complement of an angle that measures 42 degrees. THX!

*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

I'll pick i mean NOT I'll BE.

*February 27, 2015*

**HELP!!!! (plz read ASAP!)**

So... I'll be Isis as an example since that reflect an 'unredeemed' (unsaved) world.

*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

Does this question means.... natural disasters or something...?

*February 27, 2015*

**HELP!!!! (plz read ASAP!)**

I'm still struggling....

*February 27, 2015*

**Theology (religion) HELP!!!! (plz read ASAP!)**

Nae one or two experiences or situations that reflect an 'unredeemed' world. What reasons can you identify for this. 300 words Please help me. I'm NOT asking you to do this essay for me .... I just don't know what to write for this essay.

*February 27, 2015*

**Math**

Two rectangles have an area of 81 square inches.Name two possible perimeters for the rectangles.

*February 26, 2015*

**math**

At 8 A.M., Dylan and his neighbor, Mickey, drove in their cars to a city that was 240 mi. away from their neighborhood. When Dylan reached the city, Mickey had 40 mi. to go. He finally completed the trip 48 minutes later. a) How long did it take Mickey to drive to the city? b...

*February 26, 2015*

**Math**

–37of the people who live in an apartment building are men. 58of the remaining people are women. The rest are children. A total of 220 men and women live in the building. How many people live in the apartment building altogether?

*February 26, 2015*

**math**

A dog weighs 44 pounds and the veterinarian thinks it needs to lose 7 pounds. Mikala wrote the equation x+7=44 to represent the situation. Kirk wrote the equation 44-x=7. Which equation is correct? Can you write another equation that represents the situation? Thank you for ...

*February 26, 2015*

**math**

Write an equation to represent each situation: 1)Juanita has 102 beads to make n necklaces. Each necklace will have 17 beads. 2)Craig is c years old. His 12-year-old sister Kaitlin is 3 years younger than Craig. 3)Kim rented skates for h hours. The rantal fee was $2 per hour ...

*February 25, 2015*

**law**

What are 2 responsibilities of the federal courts?

*February 24, 2015*

**math**

Use the information below to write and simplify an expression to find the total weight of the medals won by the top medal-winning nations in the 2012 London Olympic Games. The three types of medals have different weights. U.S.A. Gold=46 Silver=29 Bronze=29 China Gold=38 Silver...

*February 24, 2015*

**Math**

The ratio of boys to girls in the checkers club at one school is 2:3. the number of club members is more than 20 and fewer than 30. how many club members are there?

*February 22, 2015*

**calculus**

given the velocity of a particle traveling along the y-axis by v(t)=tsin(t^2)

*February 22, 2015*

**math**

thank you Ms. Sue. I get mixed up a lot with these kind of problems. you really break it down to be able to understand. thank you

*February 21, 2015*

**math**

please help on this problem. -2x+4(3x-4)=84. cant get the answer. thank you

*February 21, 2015*

**chemistry**

could one separate the components of a mixture of PbCl2 and Mg(OH)2 using only cold water?

*February 21, 2015*

**History**

100%

*February 20, 2015*

**AP calculus**

If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring?

*February 20, 2015*

**AP calc**

If the work required to stretch a spring 2 ft beyond its natural length is 6 ft-lb, how much work is needed to stretch it 18 in. beyond its natural length?

*February 20, 2015*

**AP calc**

A spring has a natural length of 18 cm. If a 22-N force is required to keep it stretched to a length of 24 cm, how much work W is required to stretch it from 18 cm to 21 cm? (Round your answer to two decimal places.)

*February 20, 2015*

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...

*February 19, 2015*

**Math 12**

a) How many different sums of money can be made from a toonie, a $5 bill and a $10 bill. I think this equals 2^3-1 b) How many different sums of money can be made from the money in (a) as well as one more $10 bill? This should equal 11. c) Why does the situation become much ...

*February 19, 2015*

**math**

thank you so much .pemdas -I get it

*February 19, 2015*

**math**

HOW do I solve this equation? 6X -5(-X - 13)=131. WHAT IS THE RULE OF ORDER TO DO THIS? THANK YOU

*February 19, 2015*

**english**

Here is my work. She didn't have an expressive manner,so it was idle to attempt to ascertain the state of her affections.

*February 18, 2015*

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. It was idle to attempt to ascertain the state of her affections. She didn't have an expressive manner. Thank you.

*February 18, 2015*

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. The door opened. The crooked little cotton -eyed piano player stood in the entrance. He was waiting for a sound to tell him where she was. Thank you.

*February 18, 2015*

**math**

thank you

*February 17, 2015*

**math**

how do i do this equation ? -158=-2x+ 2(7x -7) . thank you

*February 17, 2015*

**Science**

An elastic cord of elastic constant k and length L is hung from point A having a massless block at the other end. A smooth ring of mass M falls from point A. What is the maximum elongation of cord?

*February 16, 2015*

**math**

thank you so much

*February 16, 2015*

**math**

Could you show me the work to get to the answer please? thank you

*February 16, 2015*

**math**

m-n divided by 4. use m =5 and n = 8. please help. ty

*February 16, 2015*

**Math**

a rectangular room on a blueprints is 2 inches wide and 5 inches longif the scale of the blueprints to the actual room is 1:72,what is the width of the room?

*February 15, 2015*

**Math**

yesterday, molly lunch cost $9.80 and she left a $1.49 tip, today molly lunch cost $12.60 if she tips at the same rate that she did yesterday how much of a tip should molly leave

*February 15, 2015*

**math analysis**

verify tan x/2=secx /secxcscx+cscx

*February 15, 2015*

**math**

How do I simplify this expression -2x +11 +6x . Thank you for help

*February 15, 2015*

**Math**

The dissipation of heat through a composite material of width w centimetres can be modelled by the function f(w)=10/w-0.77ln(w)–3.2 You are required to find the width of material that will prevent any heat dissipation. State what equation you will need to solve?

*February 14, 2015*

**math**

Tony is on his way home in his car. He has driven 12 miles so far, which is three-fourths of the way home. What is the total length of his drive?

*February 13, 2015*

**Health and PE**

I agree with bobpursley, BMR means the rate at which you use energy when your body is at rest. C. is the only one that makes sense.

*February 12, 2015*

**math**

A farmer wants to fence a small rectangular yard next to a barn. Fence for side parallel to the barn will cost 75 per foot and the fence for the other two sides will cost 30 per foot. The farmer has a total of 1750 dollars to spend on the project. Find the dimensions for the ...

*February 12, 2015*

**math**

The University of Oregon girls club soccer team is raffling off a bicycle to raise money for new equipment. If they charge 2 dollars per ticket, they will sell 600 tickets. For each 50 cent increase in ticket price, they will sell 30 fewer tickets. What ticket price should ...

*February 12, 2015*

**maths**

15?3/2

*February 10, 2015*

**Trigonometry**

someone answer pls

*February 10, 2015*

**Trigonometry**

Christian is between two tall buildings 10m away from the taller building if the angle of the top of the building from where he stands bears N8DEGREESW for the taller one and N10DEGREESE for other,how far is he from the other building if the taller building is 5/4 as tall as ...

*February 10, 2015*

**history ww1**

does anyone has any links with primary sources of the ww1?

*February 10, 2015*

**Math**

Three

*February 9, 2015*

**math**

4,812. Thank you

*February 9, 2015*

**math**

A box in the shape of a rectangular prism has a dimension of 30 meters x 27 meters x 28 meters. What is the surface area of the box?

*February 9, 2015*

**trig**

A man is between two tall buildings 8m away from the taller building. If the angle of the top of the building from where he stans bears N 8degrees W for the taller one and N 12degrees E for other. How far is he from the other building if the taller building is 6/5 as to the other

*February 9, 2015*

**trig**

sir steve ????

*February 9, 2015*

**trig**

explain sir :(

*February 9, 2015*

**phi 103**

Don’t you dare vote for universalized healthcare. (Points : 1) Proposition Non-proposition

*February 8, 2015*

**Physics**

Help I don't understand how to do this homework question, we didn't go over any like it in class. A car has an average speed of 80.0km/h for 1 hour, then an average speed of 90.0km/h for 2 hours during a 3 hour trip. what was the average speed for the 3 hour trip?

*February 8, 2015*

**phi 103**

For John Dewey, open-minded inquiry is: (Points : 1) The virtue that prevents habit from making us unwilling to hear other ideas Something only a child can do For people who are weak in their beliefs Reinforcing our own beliefs by talking with people who share those beliefs ...

*February 8, 2015*

**math**

Write a quadratic function rule for the given table in problems 4 and 5. 4. X (0, 1, 2, 3) Y (-6, -5, -7, 3) a. y= x-6 b. y= x-4 c. y= x^2 - 3 d. y= x^2 - 6 5. X(-1, 0, 1, 7) Y(5,4,5,8) a.y=x+4 b.y=x^2+4 c.y= x^2+6 d.y=x+6

*February 6, 2015*

**algebra**

in a triangle find the value of x when 7x + 3x + 90 degrees = 180 degrees

*February 6, 2015*

**physic**

A student stands on a rotating disk holding 4-kg objects with each hand. hen his arms are extended horizontally, the object are at 0.8m from the axis of rotation and he rotates at 0.7 rad/sec. The moment of inertia of the student plus the disk is 3.00 kgm^2 and is assumed to ...

*February 5, 2015*

**physic**

A 25 gm bullet is fired into a 2.25kg ballistic pendulum and becomes embedded in it. If the pendulum moves a vertical distance of 10cm, calculate: A. The speed of the system after collision B. The initial speed of the bullet C. The percentage of the energy lost in the process.

*February 5, 2015*

**physic**

A 0.25-kg punk, Initially at rest on a frictionless horizontal surface, is struck by a 0.20kg punk that is initially moving along the x-axis with a velocity of 2.20 m/sec. After the collision, the 0.20 kg punk has a speed of 1.5 m/s at an angle of 37 to the positive x-axis. ...

*February 5, 2015*