# Posts by MatT

Total # Posts: 2,378

**Linear Algebra**

Hi, I really need help with these True/False questions: (a) If three vectors in R^3 are orthonormal then they form a basis in R^3. (b) If Q is square orthogonal matrix such that Q^2018 = I then Q^2017 = Q^T. (c) If B is square orthogonal matrix then B^?1 = B^T. (d) If for some...

*March 26, 2017*

**Math**

an 8% solution, a 10% solution, and a 20% solution of sulfuric acid are to be mixed to get 100 milliliters of a 12% solution. How many milliliters of each must be mixed if the volume of the 20% solution must be 25 milliliters less than the volume of the 10% solution

*March 20, 2017*

**Algebra**

Multiply -4b by 1-b/b? I did -4b/1 × 1-b/ b But my answer isn't adding up?

*March 15, 2017*

**Math**

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10. It is a rectangle with a x in the middle.

*March 5, 2017*

**Math**

It is a rectangle with a X in the middle

*March 5, 2017*

**Math**

Can't post picture

*March 5, 2017*

**Math**

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10.

*March 5, 2017*

**Geometry**

No that does not work

*March 5, 2017*

**Geometry**

In the figure to the right, ABCD is rectangle. Find the area of ?ABC, if the area of ?AOD is 10.

*March 5, 2017*

**Analytical Chemistry**

A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with ...

*February 27, 2017*

**Math**

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23? Is the answer five or six students?

*February 20, 2017*

**Physics **

What is the total amount of potential energy that can be stored in a 10,000 gallon water tower built with the water tank 61.50 m above ground level? <hint: You will need to look up the mass of a gallon of water in Kilograms>

*February 14, 2017*

**Physics **

A 250.0 kg motorcycle can roll 45.9 m up a long hill before coming to a stop if the motorcycle approaches the base of the hill 30.0 m/s.

*February 14, 2017*

**math**

domain- -7<x<2 range- -8<y<7

*January 20, 2017*

**algebra**

does it say how many coins total

*January 20, 2017*

**language arts**

Wtf @Cam'Ron

*January 6, 2017*

**Physics**

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 1.5 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 3.2 kg and is initially at rest. The collision is not head-on. ...

*December 8, 2016*

**Calculus (vectors)**

A plane must travel S15E at 720km/h. If the wind Is from S35W at 130km/h, what heading and airspeed should the pilot set to reach the destination. I got 648km/h E8.89S

*December 8, 2016*

**Math**

Is 21/2 a fraction or division?

*December 7, 2016*

**Science**

Bb is an example of an organism's ______. "Bb" is from Punnett square

*December 7, 2016*

**Math**

A rectangular Persian carpet has a perimeter of 216 inches. The length of the carpet is 30 inches more than the width. What is the dimension of the carpet

*December 4, 2016*

**Integral Calculus**

Thanks, Steve. Now I got parts b and c down. How would I go about doing parts d and e?

*December 1, 2016*

**Integral Calculus**

We can use this power series to approximate the constant pi: arctan(x) = (summation from n = 1 to infinity) of ((-1)^n * x^(2n+1))/(2n+1) a) First evaluate arctan(1) without the given series. (I know this is pi/4) b) Use your answer from part (a) and the power series to find a...

*December 1, 2016*

**Calculus application of sin function**

a horizontal position of the pendulum of a grandfather clock can be modelled by h(t)=Acos(2(pi)t/T), where A is amplitude of the pendulum in meters, t is time in seconds, and T is the period of the pendulum, in seconds. If the pendulum has a velocity of v(t)=sin Pi(t) find: A...

*November 25, 2016*

**Calculus**

Find the local maximum and minimum values of the following curve within the given domain. y=SECx-TANx 0 ? x ? 2?

*November 24, 2016*

**Calculus**

determine all asymtote(s) of f(x)= 1/(x(x-1)^2) using limits

*November 23, 2016*

**Calculus**

find the point(s) of inflection on the function f(x)= 10x + 10/x

*November 23, 2016*

**Math, Surds**

The area of a square vegetable guarden is 60m^2. a) What is the exact length of each side of the garden? b) If a fence of a chicken wire is to be constructed around the vegetable garden, what length (to the nearest meter) of chicken wire is needed. It needs to be answered in ...

*November 21, 2016*

**Calculus**

the question asked for 144 not 114, if you plug in 144 you will get x=4

*November 19, 2016*

**Calc**

Find the value(s) of c guaranteed by the Mean Value Theorem for Integrals for the function over the given interval. f(x) = 4?x [4, 9]

*November 18, 2016*

**Math**

Use the limit process to find the area of the region between the graph of the function and the x-axis over the given y-interval. g(y) = 4y2 ? y3, 1 ? y ? 3

*November 18, 2016*

**Math**

On a trip of d miles to another city, a truck driver's average speed was x miles per hour. On the return trip the average speed was y miles per hour. The average speed for the round trip was 50 miles per hour. Show that y=25x/(x-25) Find the limit of y as x approaches 25 ...

*November 18, 2016*

**Math**

The measurement of the radius of a circle is 16 inches, with a possible error of .25 inches. Use differentials to approximate the possible propagate error in computing the area of the circle.

*November 18, 2016*

**Integral Calculus**

I am unable to find the formula for this given sequence: {2, -6/4, 24/16, -120/64, 720/256,...} So far, I know it's at least this: a(sub(n)) = ((-1)^(n+1))/(4^(n-1)) Basically, all I'm having trouble with is finding the pattern between the numerators. If anybody can ...

*November 17, 2016*

**Algebra**

Solve. x^2-xy+3y^2=15, x-y=2 Thank you

*November 15, 2016*

**Algebra**

Find an equation of a hyperbola with vertices (0?,3) and ?(?4?,3) and e=3/2. Thank you

*November 15, 2016*

**Algebra**

which equation represents the relationship shown in the table below? x | 0 | 1 | 2 | 3 | __________________ y | -3 | -1 | 1 | 3 | a.) y = -x - 3 b.) y = x - 3 c.) y = 2x - 3 d.) y = -2x + 3

*November 15, 2016*

**Physics**

A 125-g arrow is shot vertically upward with an initial speed of 28 m/s. Assuming 30% loss in total mechanical energy while ascending, what maximum height above the position from which it was shot does the arrow reach?

*November 12, 2016*

**Maths**

During a run of bad luck a player lost 25% of her points each half hour. She started with 256 points. How much would she have left after 2 hours

*November 9, 2016*

**Physics**

Suppose that instead of our sun, our star were a giant star such as Betelgeuse. The mass of Betelgeuse is estimated to be about 20 times that of our sun. With earth in the same orbit? With its same mass, how long would our year be in earth days if we orbited Betelgeuse?

*November 7, 2016*

**Physics**

A) the earth year is 365.25 days long. How long would our year be if earth followed the same orbit, but was only the mass of Mars? Answer this in earth days. B) How long would our year be if earth were the same mass, but had the orbital distance of mercury Answer this in earth...

*November 7, 2016*

**Physics**

At a height of 500km above earth, a satellite will orbit the earth once every 95 minutes. Find the mass of the earth based on this idea. B) How far above earth's surface would a satellite need to orbit so that it revolves at exactly the same rate as the earth's rotation?

*November 7, 2016*

**Physics - Circular motion**

A domesticated pig places a 100g rubber puck on a turntable. The turntable is set at a rate of 78rpm,and the pig knows the coefficient of static friction is 0.37 between the puck and turntable surface. A) How far out from the center of the turntable can the puck be places ...

*October 31, 2016*

**Physics - circular motion**

You approach a slight bump in the road on the highway in a car. The bump carries you into a circular (convex) vertical arc of radius 39m. A) choosing two different cars ( it is for you to choose 2 particular models, providing the mass of each), at what maximum speed can you ...

*October 31, 2016*

**physics**

quarterback throws a pass to a receiver, who catches it at the same height as the pass us thrown, The initial velocity of the ball is 15.0 m/s, at an angle of 25.0 degrees above the horizontal. How long is the ball in the air?

*October 30, 2016*

**Calculus**

Use the limit process to find the area of the region between the graph of the function and the y-axis over the given y-interval. f(y) = 7y, 0 ≤ y ≤ 2

*October 29, 2016*

**Biomechanics**

An athlete jumps straight upwards at 2.5 m/s, find: 1. a) total flight time 2. b) maximum jump height

*October 28, 2016*

**Calculus**

differentiate the given function, simplify your answer by leaving no negative or rational exponents. final answer should be in factored form where possible. y=(x^2 +2x)^3(x+2)

*October 20, 2016*

**Calculus**

A nut store sells 200 bags of almonds per month at a price of $5 per bag. For every $0.20 decrease in the price, the store sells five more bags per month. Determine the marginal revenue when 120 bags are sold.

*October 20, 2016*

**Calculus**

A nut store sells 200 bags of almonds per month at a price of $5 per bag. For every $0.20 decrease in the price, the store sells five more bags per month. Determine the marginal revenue when 120 bags are sold.

*October 19, 2016*

**Calculus**

The demand function for a bottle of hand lotion is p(x)=0.78+0.0003x, where x is the number of bottles sold and p is the price, in dollars. The cost function is c(x)=480-0.32x+0.0005x^2. Find the marginal profit when 700 bottles of hand lotion are sold.

*October 19, 2016*

**Calculus**

is that 1/9 or 1/3

*October 19, 2016*

**Calculus**

Determine the coordinates of the point on the graph of f(x)=3x^2-7x+4 where the tangent line is parallel to the line 5x+y=3

*October 19, 2016*

**Calculus**

find the point, (c,f(c)), on f(x)=x^2 in the interval 0≤X≤4, such that f'(c) equals the average rate of change over that interval.

*October 19, 2016*

**Calculus**

Determine the equation of the tangent to f(x)= (1/x)+x at the point (1,2)

*October 19, 2016*

**Organic Chemistry**

Butanamide (Amide) vs Aminobutane (Amine) Which compound do you think has the higher melting point? Explain your reasoning.

*October 17, 2016*

**Science**

Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl-

*October 15, 2016*

**Calculus**

Lim (√(3-x) - √(3+x)) /x x->0

*October 15, 2016*

**Calculus**

Lim √(3-x) - √(3+x) x->0 x

*October 15, 2016*

**calculus**

ok got it thanks

*October 15, 2016*

**calculus**

thats 0.2m/s right?

*October 15, 2016*

**calculus**

(Compute all instantaneous rate of change using the limit of the difference quotient) 2) A football's path is represented by the function h(t)=-4.9t^2 +10t+2, where h is its height, in meters, after t seconds. Find the rate of change of the football's height at 1s.

*October 15, 2016*

**Calculus**

thanks that's a better way to write it

*October 15, 2016*

**Calculus**

Determine the average rate of change of f(x)=1/(x^2 -x) over the interval 2 is less then or equal to x and 3 is greater or equal to x.

*October 15, 2016*

**Physics**

An antique cabinet is in the cab of a pickup truck traveling 20.1 m/s and has a coefficient of static friction of 0.250 between the antique and the cab. In the event of a sudden stop, what is the shortest distance the pickup truck can stop without having the cabinet move ...

*October 13, 2016*

**physics**

a child saw a skunk in a hole of a tree, standing 2.5m away. the child attempted to throw a pebble into the hole but missed with a speed of 11m/s. Angle of elevation is 75 degree, what was the Vfy of the pebble.

*October 10, 2016*

**daymon**

a child saw a skunk in a hole of a tree, standing 2.5m away. the child attempted to throw a pebble into the hole but missed with a speed of 11m/s. Angle of elevation is 75 degree, what was the Vfy of the pebble.

*October 10, 2016*

**Science**

Thank you Ms. Sue

*October 10, 2016*

**Science**

Where can I look and/or what website can I look at for the different components of the scientific method process? Please help

*October 10, 2016*

**PHYSICS**

a 75kg parent and a 22kg child meet at the center of an ice rink. they place their hands together and push hard enough to slide apart. a. is the force experienced by the child more than, less than, or the same force experienced by the parent? I said they experience the same ...

*October 10, 2016*

**Physics**

A spring with a spring constant of 22.0 N/cm has a block attached to one end and the other end is fixed. How much work does the spring do on the block if the spring is stretched from relaxed length by 6.8 mm as the block is moved? How much additional work is done by the spring...

*October 9, 2016*

**Science**

D=M/V

*October 9, 2016*

**Math**

What prime number am I? I have 3 prime factors Each prime factor is a different number I am a multiple of 10 I am less than 50

*October 5, 2016*

**Math**

Yes I know the total is 7 because 3 plus 4=7 but they are only asking the multiple choice answers

*October 4, 2016*

**Math**

So then would the answer be C?

*October 4, 2016*

**Math**

Pardon me. I believe I got the wrong answer I believe the answer would be C because they say in the word problem the ratio of blue paint to yellow paint. Can you please check my answer.

*October 4, 2016*

**Math**

To make green paint, Jeff's art teacher instructed him to mix blue and yellow paint. To make the desired shade of green, the ratio of blue paint to yellow paint is 3:4. What the does the ratio 3:4 mean? a. 4 parts yellow for every 3 parts blue b. 4 parts blue for every 3 ...

*October 4, 2016*

**Math**

So basically I would have to find out what the common facto of 36 and 24 first and then what would I do next?

*October 4, 2016*

**Math**

Robin and Emily are selling boxes of candy bars. Robin sells 36 boxes of candy and Emily sells 24 boxes of candy. Which expression, using the form a(b+c), represents the amount they sold altogether? a. 2(12+24) b. 4(9+6) c. 24(6 + 36) d. 12 (3+2) Can you explain to me if I add...

*October 4, 2016*

**Math**

Ty Ms. Sue

*October 4, 2016*

**Math**

I think I just solved it. I just watched a video on how to do division equations so it would be using inverse multiplication. x/42=21 x/42x42=21x42 x times 1=882 x=882 To check 882/42=21 21/21=1 Do I have the proper understanding of this somewhat. Let me ask you one thing ...

*October 4, 2016*

**Math**

Ms. Jones wrote the equation below on the board. x divided by 42=21 If the equation Ms. Jones wrote is true which of the following equations must be true? Answers: a. x=21 divided by 42 b. x=21 x 42 c. x=42 divided by 21 d. x=21 plus 42 I am not sure where to begin on this at ...

*October 4, 2016*

**Math**

Robin and Emily are selling boxes of candy bars. Robin sells 36 boxes of candy and Emily sells 24 boxes of candy. Which expression, using the form a(b+c), represents the amount they sold together a. 2(12+24) b. 4(9+6) c. 24 (6 + 36) d. 12 (3 + 2) My answer is B 9+6=15x4=60 60 ...

*October 4, 2016*

**Math**

Thank you checking on this.

*October 4, 2016*

**Math**

If it costs $75 to buy 3 video games, how much money will Jordan need if he wants to buy 12 video games? $75.00/3 video games=$25.00 for 1 video game $25.00 x 12 video games=$300.00 for 12 video games Can you please double check my answer to see if I got it correct. Thank you

*October 4, 2016*

**Math**

Mrs. Hanson's class of 22 students shares 132 colored pencils Which statement is true? a. For each student there are 7 colored pencils. b. For each student there are 6 colored pencils c. For every 7 students, there is 1 colored pencils d. For every 6 students, there is 1 ...

*October 4, 2016*

**Math**

Shelby drove to her aunt's house, which is 360 miles away. If it took her 5 hours and she drove at a constant rate, what was Shelby's average speed? My answer which I figured out in two different ways: 360 miles/5 hours=72 mph 360 miles/5 hours=x/1 hour=72 mph Can you ...

*October 4, 2016*

**Math**

I think I understand now. I would do 3.5 gal x 16 cups/1 gallon=56.0 cups I could also add 16 cups + 16 cups+16 cups=48 cups+8 cups (8 would be half of 16)=56.0 cups Thank you Ms. Sue for your help.

*October 3, 2016*

**Math**

Rita needs to measure out 3.5 gallons of vinegar for a science experiment However, her only measuring tool is a measuring cup that holds 1 cup. How many cups of vinegar does she need? I am confused on this can you please help me?

*October 3, 2016*

**chem**

Calculate the number of grams of Fe formed when 0.350 kg of Fe2O3 reacts. m = g

*September 28, 2016*

**Math**

Thank you Ms. Sue or checking on this.

*September 28, 2016*

**Math**

Molly has 15 marbles in a jar. What is the ratio of black to white marbles? There are 8 black marbles and 7 white marbles. A. 7:8 B. 7:15 C. 8:7 D. 8:15 My answer would be C Can you please double check my answer and tell me if I am right or wrong.

*September 28, 2016*

**Math**

So then the answer would be D

*September 28, 2016*

**Math**

Which table correctly fills in the ratio table below? Boys 3 6 ___ 21 Girls 2 4 6 ____ A. Boys 3 6 9 21 Girls 2 4 6 20 B. Boys 3 6 9 21 Girls 2 4 6 8 C. Boys 3 6 13 21 Girls 2 4 6 8 D. Boys 3 6 9 21 Girls 2 4 6 14 I believe the answer is B Could you please tell me if I am ...

*September 28, 2016*

**Math**

Jason watched a caterpillar move 10 feet in 2 minutes. Jason says the caterpillars unit rate is 0.2 feet per minute. Is Jason correct? Explain. I believe that Jason is correct because: If you have 2 minutes/10 feet=x/1 10/10=1 2/10=0.2 If you have 10 feet/2 minutes 2/2=1 10/2=...

*September 28, 2016*

**Math**

Marta, Loribeth, and Ira all have bicycles. The table shows the number of miles of each rider's last bike ride, as well as the time it took to complete the ride. Marta: Distance of Last Ride (in miles) 8 Time Spent on Last Bike Ride (in minutes) 80 Loribeth: Distance of ...

*September 27, 2016*

**Math**

Kim was walking down a rocky path. For 4 minutes, the elevation dropped steadily. Altogether it dropped 8 feet. What was the change in elevation per minute for the 4 minute?

*September 26, 2016*

**Algebra**

A number n is less than 6 units from 0. write inequality and solve it.

*September 22, 2016*

**PHYSICS**

does an object speed up or slow down when: 1. its velocity is positive (right) and its acceleration is positive (right)? I said it speeds up 2. its velocity is positive (right) and its acceleration is negative (left)? I said it slows down 3. its velocity is negative (left) and...

*September 22, 2016*

**MATHEMATICS**

if 1g of a drug whose half-life is 9 hours is administered intravenously, how much of the drug is left after 3 hours? after 5 hours? after 10 hours?

*September 21, 2016*