# Posts by sc

Total # Posts: 55

**MATHEMATICS**

oh thank you , I have worked on that for hours!!:)

*February 24, 2016*

**MATHEMATICS**

TO MAKE 5 SETS OF CURTAINS, WHEN EACH SET REQUIRES 2 1/3 YARDS, HOW MANY OF MATERIAL ARE NEEDED? (1) 7 1/3 (2) 9 2/3 (3) 10 1/3 (4) 10 2/3 (5) 11 2/3 I think the answer is (5) 11 2/3??

*February 24, 2016*

**physics**

A car with a mass of 1.2 × 103 kilograms starts from rest and attains a speed of 20 meters/second in 5 seconds. What net force acted on the car to cause that acceleration? 3.0 × 102 newtons 6.0 × 102 newtons 1.2 × 103 newtons 4.8 × 103 newtons 1.2...

*June 22, 2015*

**physics**

What amount of heat is required to raise the temperature of 20 grams of water from 10°C to 30°C? The specific heat of water is 4.18 J/g°C. 1200 joules 1500 joules 1700 joules 1900 joules 2000 joules

*June 22, 2015*

**physics**

A 0.6 kg block of ice is sliding by you on a very slippery floor at 2.5 m/s. As it goes by, you give it a kick perpendicular to its path. Your foot is in contact with the ice block for 0.0035 seconds. The block eventually slides at an angle of 24 degrees from its original ...

*June 23, 2014*

**physics**

A proton has mass 1.7×10−27 kg. What is the magnitude of the impulse required to increase its speed from 0.995c to 0.998c? magnitude of impulse = i used mv=vectorp i don't know what to do from there

*June 19, 2014*

**physics**

Two Bals of masses mA = 45 grams and mB = 65 grams are suspended as shown. The lighter ball is pulled away to a 66 degree angle with the vertical and released: ============================== '''''''''/|''|'''-''&#...

*April 9, 2013*

**physics**

Two Bals. of masses mA = 45 grams and mB = 65 grams are suspended as shown. The lighter ball is pulled away to a 66 degree angle with the vertical and released: ============================= ---------/| | - --------/è| | | -------/ | | | 30 cm ------/ | | | -----mA...

*April 9, 2013*

**physics**

Two Bals. of masses mA = 45 grams and mB = 65 grams are suspended as shown. The lighter ball is pulled away to a 66 degree angle with the vertical and released: ----------------------------- /| | - /è| | | / | | | 30 cm / | | | mA | | | mA mB - where è = 66 ...

*April 9, 2013*

**Math**

An indoor running track has the dimensions shown. The ends of the track are semicircles. If the track is to be resurfaced, how many square feet of material will be required? The semicircle is listed at 34 ft., the straightaway at 80 ft., and individual lane width is 5ft. ...

*May 9, 2012*

**Statistics**

According to insurance records a car with a certain protection system will be recovered 89% of the time. Find the probability that 3 of 7 stolen cars will be recovered.

*May 3, 2012*

**statistics**

The below table shows the probabilities generated by rolling one die 50 times and noting the up face. What is the probability of getting an odd up face? roll 1 Probability 0.22 roll2 probability 0.10 roll 3 probability 0.18 roll 4 probability 0.12 roll 5 probability 0.18 roll ...

*May 3, 2012*

**Algebra**

x_< 2 y_>-2x+4

*May 3, 2011*

**physics**

a object is traveling horizontaly when it reaches a 50meter drop how fast must the object be traveling to land 90 meters away from the edge of the drop

*September 9, 2010*

**Chemistry**

I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it. (a) atomic number=53, number of neutrons=79 I looked at the periodic table for 53 so the element is Iodine. So They gave the atomic number and I have the element, I need the ...

*April 6, 2010*

**Math**

Hi, I need help differentiating this equation y=(cos5x) (e^-5x ) This is what I tried to do.... -5 (sin5x) (e^-5x) + 5 (e^-5x) (cos5x)

*February 7, 2010*

**Math**

ahhh i see. dang, then I got this one wrong on the test. thank you!

*February 2, 2010*

**Math**

Find the Limit Lim x-5/ (1/x)-(1/5) x->5 can I assume that 1/x is going to infinity so (1/x) is zero? so then I will be left with: 5-5/ (-1/5) 0/ (-1/5) =limit is 0?

*February 2, 2010*

**Math**

Oh okay thank you!

*February 2, 2010*

**Math**

Find the Derivative of: F(x)= (x^2) (e^x) + (e^x) would I use the product rule? F'(x)= 2x(e^x) + (e^x) (x^2) + (e^x) = (e^x) ( x^2 + 2x + 1 )

*February 2, 2010*

**Math**

is parametric equation same as the uniform linear motion? where x(t)=a+bt , y(t)c+dt would I use this to solve for a?

*January 18, 2010*

**Math**

Cameron is located 2 miles due East of an intersection between two country roads. He decides to walk in a straight line (cross-country) toward a position 3 miles due North of the intersection; it takes Cameron one hour to reach that location. (a) Find parametric equations for ...

*January 18, 2010*

**Math**

The location of an object on the x-axis at time t seconds is given by x(t)= a + mt, where a, m are constants. (a) Where is the object located at time t=1? x(1)= a+m(1) = a+m (b) What is the average velocity of the object between 1 and 2 seconds? x(2)-x(1)/(2-1) a+2m-(a+m)=m (c...

*January 18, 2010*

**Math**

Explain why the function is discontinuous at the given number a. f(x)=ln l x-2 l a=2 I don't understand how I would explain this.. in the back of the book it said f(2) is not defined. What do they mean by that?

*January 14, 2010*

**Math**

ohh i see it now! thank you!

*January 6, 2010*

**Math**

If a ball is throw into the air with a velocity of 40ft/s its height in feet t seconds later is given by: y=40t-16t^2. Find the average velocity for the time period beginning when t=2 and lasting 0.5 seconds.

*January 6, 2010*

**MATH**

Danny is measuring the loudness of a police siren. At t=2 seconds, the siren's loudness is at its maximum of 112 dB for the first time. At t=7 seconds, the siren's loudness is at its minimum of 88 dB for the first time. The loudness is a sinusoidal function of time, t...

*December 10, 2009*

**Math**

Romeo and Juliet are moving in the xy-plane. Juliet starts at the point (0,20( and moves in a straight line at a constant speed. She will pass through the origin in exactly 5 seconds. Romeo starts at the same time from the point (30,0) and moves in a straight line at a ...

*December 10, 2009*

**Math**

The temperature in a certain cave is a sinusoidal function of time. When you first enter the cave, you set up a thermometer to record the temperature. After 19.5 hours, the temperature in the cave is at its maximum: 35 degrees celsius. The temperature then dropped, reaching ...

*December 8, 2009*

**math**

Thanks you! I get it now!

*December 8, 2009*

**math**

Let f(x)=x+2 Ix-3I and g(x)=3x-1 Find all solutions to the equation f(g(x))=-4x So this is what I did... (3x-1)+2 I(3x-1)-3I=-4x (3x-1)+2 I3x-4I=-4x This is where I got stuck. What do I do with the absolute value? and this part?(3x-1)+2=3x+1 ??

*December 8, 2009*

**Math**

Shirley is on a ferris wheel which spins at the rate of 3.2 revolutions per minute. The wheel has a radius of 45 feet, and the center of the wheels is 59 feet above the ground. After the wheel starts moving. Shirley takes 16 seconds to reach the top of the wheel. How high ...

*November 28, 2009*

**Math**

Lee is running around the perimeter of a circular track at a rate of 10 ft/sec. The track has a radius of 100 yards. After 10 seconds, Lee turns and runs along a radial line to the center of the circle. Once he reaches the center, he turns and runs along a radial line to his ...

*November 24, 2009*

**Math**

f(x)=10x-5*******

*November 17, 2009*

**Math**

Let f(x)-10x-5. Find a function h(x) such that h(h(x))=f(x).

*November 17, 2009*

**Math**

Find the linear-to-linear function who graph passes through the points (1,1) (5,2) and (20,3). I know the function is y=ax+b/x+d. I need help getting it to that form.

*November 9, 2009*

**Math**

Ohh all i needed to do was divide! heh thanks a lot!

*November 5, 2009*

**Math**

I made a mistake. after eight days , its 199.99 spiders. I still don't understand how would we get s?

*November 5, 2009*

**Math**

The population of termites and spiders in a certain house are growing exponentially. the house contains 100 termites the day you move in. After 4 days, the house contains 200 termites. Three days after moving in, there are two times as many termites as spiders. Eight days ...

*November 5, 2009*

**Math**

In 1987, the population of Mexico was estimated at 82 million people, with an annual growth rate of 2.5%. The 1987 population of the United States was estimated at 244 million with an annual growth rate of 0.7%. Assume that both populations are growing exponentially. When will...

*November 5, 2009*

**Math**

In 1968, the U.S. minimum wage was $1.60 per hour. In 1976, the minimum wage was $2.30 per hour. Assume the minimum wage grows according to an exponential model w(t), where t represents the time in years after 1960. Find the Formula for w(t) My work so far: n=y(not) t=0 y=1.60...

*November 3, 2009*

**Math**

Pam is taking train from the town of Rome to the town of Florence. Rome is located 30 miles due West of the town of Paris. Florence is 25 miles East, and 45 mies North of Rome. On her trip, how close does Pam get to Paris? My work so far... She's in Rome due West, so would...

*October 12, 2009*

**Math**

Oh! I think I made a mistake in writing out the equation! thanks for pointing it out. I know what to do now thank you!

*October 12, 2009*

**Math**

How would you simplify (-x^2+2xh+h^2-2x-2h-2x^2+4x)/h ?

*October 12, 2009*

**Math**

Find the point of intersection between y=2-(1/2)x and y=1+ax. (a=alpha sign). You answer will be a point in the xy plane whose coordinates involve the unknown a . I got that which is x=2/(2a+1), y=(1+2a)/(2a+1) <-intersection point I need help is to: Find a (a=alpha sign) ...

*October 9, 2009*

**Math**

Thanks for helping. What you explained to me makes sense. But i checked the back of the book and it said for (a) they will be equal in 1995 at $214,313. so is (b) it said its 1982.70 Sea=$124,965. weird... I going to try these problems out! and see what answers I get! thanks ...

*October 8, 2009*

**Math**

This is the (average) sale price for single family property in Seattle and Port Townsend Year Seattle Port Townsend 1970 $38000 $8400 1990 $175000 $168400 (a) When will the average sales price in seattle and port t. be equal and what is this price? (b)When will the average ...

*October 8, 2009*

**Math**

thank you! =D

*October 8, 2009*

**Math**

Find the point of intersection between y=2-(1/2)x and y=1+ax. (a=alpha sign). You answer will be a point in the xy plane whose coordinates involve the unknown a . My work so far: I set the two equations equal to each other because they intersect. 1+ax=2-(1/2)x and I got, (-1...

*October 8, 2009*

**physics**

A 10000 car comes to a bridge during a storm and finds the bridge washed out. The 750 driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 22.8 above the river, while the opposite side is a mere 5.60 above the river. The ...

*September 17, 2009*

**9th. algebra**

how can I figure out the formula. example. I need to transform the following equation y = x2 + 4 - 8 into vertex form and then I need to state the coordinates of the vertex of the parabola. I forgot how to arrive at the answer

*May 29, 2009*

**Math**

Suppose you drop a ball from the top of a five-story building onto the sidewalk 70 ft below. a. What is the initial velocity of the ball? b. Determine a function for the height of the ball t seconds after it's released. c. How long will the ball be in the air before it ...

*March 24, 2009*

**Research Project on Computer Confidentiality**

same problem cant find resouces

*November 12, 2008*

**Math**

Thanks

*October 23, 2008*

**12 Biology--THIS IS URGENT**

but would it change because some of the codons are extracted during the introns excision ??

*April 13, 2008*

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