# Posts by Kevin

Total # Posts: 1,240

**Math**

I'm a dad trying to help my daughter. Question is kx+6y-5=0 3x+2y+4=0. Need to find 1. Value of k such that the lines are perpendicular and 2. The angle of inclination of the second line given

*March 9, 2017*

**Math**

Why is log1/a(x), a reflection over the x axis?

*February 28, 2017*

**Algebra**

A rectangle's length is 6 less than twice its width. The perimeter of the rectangle is 36 units. Set up and solve a system of equations to determine the length and width.

*February 26, 2017*

**Algebra**

A boat traveled 180 miles downstream and back. The trip downstream took 10 hours. The trip back took 30 hours. Find the speed of the boat in still water and the speed of the current. Solve each system using any method

*February 26, 2017*

**Math**

Describe transformations of f(x)=-f(2-x)

*February 17, 2017*

**Calculus**

Air is being pumped into a spherical hot air balloon at a rate of 50 cm^3/min. Determine the rate at which the radius of the balloon is increasing when the diameter of the balloon is 200 cm.

*February 15, 2017*

**Help math**

find 2 exponential functions with asymptote of y=80 , with points (0,176) (1,169) (3,156) (5,146) (20,101) (30,90) (60,81).one should have the base of "e"

*February 14, 2017*

**Pre calculus**

find 2 exponential functions with asymptote of y=80 , with points (0,176) (1,169) (3,156) (5,146) (20,101) (30,90) (60,81).one should have the base of "e"

*February 14, 2017*

**4th grade math**

We're going to add all the time she spent doing all these activities. When adding fractions remember to first find their least common denominator. 10 is the LCD. Therefore, 1/5 becomes 2/10 3/10 remains the same because it already has a 10 in the denominator 4/5 becomes 8/...

*February 14, 2017*

**Calculus**

A hang glider is standing at the top of a 3,000 foot cliff. The hang glider jumps off and begins to descend at a constant rate of 50 feet per second, how fast is the area of the triangle formed by the cliff, the hang glider, and the ground changing at the instant when the hang...

*February 13, 2017*

**Algebra **

When swimming in the direction of the current in a river your average speed is 5 mph. When swimming against the current your speed is 2mph. Find your swimming speed in still water and the speed of the current.

*February 12, 2017*

**Algebra**

A cashew and raisin mixture costs $2 per pound. You buy a 4.5,pound mixture of cashews and raisins. If cashews cost $2.50 per pound and raising cost $1.25 per pound, how many pounds of cashews and how many pounds of raisins make up the mixture?

*February 12, 2017*

**Algebra**

John and Kathleen each improved their yards planting rose bushes and shrubs . They bought their supplies from the same store. John spent $228 on 12.rose bushes and 11 shrubs. Kathleen spent $108,on 6 rose bushes and 5 shrubs. Find the cost of one rose bush and the cost of one ...

*February 12, 2017*

**Algebra **

Write a system of equations to solve each word problem. You deposit a total of $900 in two different accounts. One account provides an interest rate of 5% while the other account provides an interest rate of 8%. If you earned a total of $64.50 in interest between the two ...

*February 12, 2017*

**Algebra**

Thank you!

*February 12, 2017*

**Algebra**

Set up a system of equations for each word problem One scuba diver starts at a depth of 12 meters below the water's surface and ascends at a rate of 1 meter per second. A second diver starts at a depth of 15 feet and ascends at a rate of 2 meters per second. After how many...

*February 12, 2017*

**Math 10C**

Janet needs a rectangular piece of cardboard measuring 21 ft by 24 ft for a school project. a) What is the area of the cardboard in square feet? b) What is the area of the cardboard in square yards? Show your calculations in two different ways. c) The store charges $0.35/m2 ...

*February 7, 2017*

**Foods and Nutrition**

Which foods contain the most protein?

*February 6, 2017*

**Physics**

Name any Margins of error that would happen in the lab "Which path requires the most energy? (gas)

*February 5, 2017*

**Math**

The number has four digits. It is greater then 11,but less then 12. The sum of the four digits is 13. The digit in the hundreds place is 6. What is the number

*February 5, 2017*

**French**

Thank You Ms. Sue

*February 5, 2017*

**French**

How does "Le Louvre", a museum in Paris, France connect to French Culture?

*February 5, 2017*

**Math**

The coordinates of the midpoint of the line AB are (1, 2). The length of the line AB is 10 units. If the gradient of AB is 0, find the coordinates of A and B

*February 1, 2017*

**math**

i did 65 miles=1 hour 63360 in=1 mile 1 hour= 60 minutes 1 rev=30 pi in the end after multiplying i got 728.3 rpm, is this correct?

*January 21, 2017*

**math **

An automobile is traveling at 65 mph. If each tire has a radius of 15 inches, at which rate are the tires spinning in revolutions per minute (rpm)? (63360in=1 mile)

*January 21, 2017*

**Algebra **

Find the value of x so that the line through the points has the given slope (2,2) and (x,9);slope: undefined

*January 19, 2017*

**Math**

Write an equation in point-slope form to represent the situation. Assume a linear relationship between the given quantities. In 1998, the deer population of a certain area was 1200. In 2006, the population was 2000.

*January 19, 2017*

**Math**

Find the slope of the line through each pair of points. Simplify as much as possible (-2g,6h), ( 2i,7g)

*January 19, 2017*

**pre-Calculus**

Make a conjeture about the symmetry of a) a product of two odd functions b) a product of two even functions c) a product of an odd function and an even function

*January 10, 2017*

**Pre-Calculus**

Tommy is building a rectangular playpen for his pigs where one side of the play area is a side of his barn. He has enough material to make a fence with a total length of 160 feet. write a función that represents the playpen's área in terms of its length ...

*January 8, 2017*

**Science**

Where can I find a pie chart that shows the percentage of resources used to generate electricity in the United States in 2015?

*December 8, 2016*

**Math**

You do not have enough 6-inch beads to make the rope, so you will use 10-inch beads instead. Write and solve an inequality that represents the number of 10-inch beads that you can use.

*December 2, 2016*

**physics**

A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 2, what distance must the spring have been compressed?

*November 18, 2016*

**Math**

How many volleyball games would Rana have to schedule if there were 10 teams in the league and each team played each other twice?

*November 9, 2016*

**pre-calculus**

Assume that the number of bacteria follows an exponential growth model: P(t)=P0ekt . The count in the bacteria culture was 900 after 20 minutes and 1600 after 30 minutes. (a) What was the initial size of the culture? (b) Find the population after 80 minutes. (c) How many ...

*November 7, 2016*

**Physics (Mechanics)**

A student of mass M = 62 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 19 m. The normal force by the track on the student at the top of the loop-the-loop is N1 = 100 N Find the speed of M at the top of the loop. ...

*October 26, 2016*

**Physics (Mechanics)**

A 905 kg car moves in a circle of radius 13.1 meters in a flat parking lot. If the car can travel at 9.1 m/s without slipping, what is the force of friction between each tire and the parking lot? What is the coefficient of friction between each tire and the lot? (Remember ...

*October 26, 2016*

**Physics**

You push a 1kg block against a spring with spring constant k = 100 Nmon a horizontal table top. The spring is compressed to 0.2m away from its relaxed length, and then the block is released. If the horizontal table top has a coefficient of kinetic friction of 0.2, how much ...

*October 23, 2016*

**Physics (Mechanics)**

Two blocks with equal masses m1 = m2 3.2 kg are connected via a pulley as shown in the above figure. Take the coefficent of kinetic friction to be 0.3 and the angle of the incline to be 40 degrees. Find the acceleration given that (Note: enter a negative value if the ...

*October 17, 2016*

**Physics (Mechanics)**

A block of mass m1 hangs vertically and is attached by a string to a block of mass m2 on a frictionless slope inclined at angle theta to the horizontal, as shown above. If m1 = 2.5 kg, it accelerates at -0.108 m/s2. If m1 = 0.8 kg, it accelerates at 2.888 m/s2. Determine the ...

*October 17, 2016*

**Mechanics**

Two blocks with equal masses m1 = m2 3.2 kg are connected via a pulley as shown in the above figure. Take the coefficent of kinetic friction to be 0.3 and the angle of the incline to be 40 degrees. Find the acceleration given that (Note: enter a negative value if the ...

*October 14, 2016*

**Mechanics**

A block of mass m1 hangs vertically and is attached by a string to a block of mass m2 on a frictionless slope inclined at angle theta to the horizontal, as shown above. If m1 = 2.5 kg, it accelerates at -0.108 m/s2. If m1 = 0.8 kg, it accelerates at 2.888 m/s2. Determine the ...

*October 14, 2016*

**geometry**

The measure of the supplement of an angle is three times the measure of the complement. Solve for the angle. I just want to find the equation but I do not understand it. I know that the angle is 40 degrees. Please teach me how to find the equation

*October 13, 2016*

**Statistics**

23 children born. What is the probability that 22 are boys & 1 is a girl?

*September 28, 2016*

**Math**

A cotton reel has a diameter of 3cm. 91 metres of cotton goes around it. How many times does the cotton go around the reel? And give your answer to the nearest ten

*September 28, 2016*

**Math**

John painted 1/2 of a pole white and 3/8 of it green. What is the fraction he painted?

*September 21, 2016*

**english**

I agree with Anonymous, in a portion of the story it reads " Luckily for her one of the talibs guarding the shack came to warn his superiors that we were refusing to leave until she returned. After hesitating for a moment, they pushed outside." In other words if the ...

*September 16, 2016*

**math**

A cylindrical tin of diameter 9cm and height 224cm is half filled with water.Find the volume of water in the tin.

*September 8, 2016*

**Calculus**

If θ is an acute angle and tan(θ)=5/12, then sin(θ)=??

*August 28, 2016*

**PHYSICS**

I agree that torque=I*ang_acc. But torque is not equal to 3g*radius but tension*radius. Do you agree with me bobpursley? Thanks.

*August 24, 2016*

**Physics**

please help me 1)In the movie The avengers, Captain America sees an alien speeder incoming. The speeder passes directly overhead at 3.65m. If he throws his shield straight up with a speed of 7.40 m/s from a height of 1.55 m above the ground (a) will the shied reach the speeder...

*August 24, 2016*

**Physics**

Totally confused on this question, Please help. 1)In the movie The avengers, Captain America sees an alien speeder incoming. The speeder passes directly overhead at 3.65m. If he throws his shield straight up with a speed of 7.40 m/s from a height of 1.55 m above the ground (a...

*August 24, 2016*

**PHYSICS/SCIENCE**

How much heat must be removed from 5.0g of water at 10°C to become ice at 0°C ?

*August 13, 2016*

**Physics/Science**

How much heat must be removed from 15.0g of water at 10°C to become ice at 0°C?

*August 13, 2016*

**physics**

an arrow is shot vertically upward 2 seconds later it is at a height of 42m with what velocity was the arrow shot, how long is the arrow in flight altogether

*August 1, 2016*

**physics**

a person in a hot air balloon ascending vertically at a constant rate of 12m/s drops a rock over the side when the balloon is 40m above the ground, what is the velocity of the rock just before it hits the ground, how long will it take the rock to reach the ground

*August 1, 2016*

**Chemistry**

if the solubilty of AgC2H3O2 is 5.0 x10^-2mol/L. What is the Ksp?

*July 29, 2016*

**physics**

a rock is dropped from a height of 20m above the ground when it hits the ground it leaves a hole 10cm deep with what speed does the rock hit the ground, and what is the magnitude of the rock's deceleration after it hits the ground

*July 28, 2016*

**Chemistry Grade 12**

If the concentration of I^-1 is found to be 2.4 x 10^-3 mol/L in a saturated solution of PbI2. What is the Ksp of PbI2?

*July 28, 2016*

**Chemistry Grade 12**

If the concentration of CN1- is found to be 1.4 × 10-6 mol/L in a saturated solution of AgCN, what is the Ksp of AgCN?

*July 27, 2016*

**Algebra/Calculus**

If x + y = xy = 3, what is x^3 + y^3? I have tried solving this using algebra alone, but my teacher told me to use complex numbers, and I don't know how to start. Can someone please guide me to the solution to this problem? Thanks Kevin

*July 11, 2016*

**Math**

5/8 of the students in my class were boys. When 6 girls joined the class, the number of boys equaled the number of girls. How many students were in my class then? "What's the formula for this problem?"

*July 3, 2016*

**Chemistry**

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca(OH)2?

*June 20, 2016*

**Calculus**

which of the following is equivalent to integral (a,b) k*f(x)+C)dx where k and C are constants k integral (a,b)(f(x)+C)dx ***** intergral (a,b)kdx + intergral (a,b)f(x)dx+ intergral (a,b) Cdx k integral (a,b)f(x)+ integral (a,b) Cdx integral (a,b) kdx * integral (a,b) f(x) dx...

*June 3, 2016*

**Calculus**

Find F'(x) for F(x)= integral[from 1 to x] of cos(t^3)dt

*June 3, 2016*

**Calculus**

lim (x--> infinidy) x^2/ln(x)= -1 0 1 e does not exist

*June 3, 2016*

**Calculus**

Which of the following grows faster than e^x as x--> infinity x^4 ln(x) e^-x 3^x .5e^x

*June 3, 2016*

**help my son's math**

Sofia had 20 comic book and gave some of them to Heather.She uses a calculator to figure out that she gave away 0.15 of her comic book.How many comic book did she give to Heather!

*June 1, 2016*

**help my son's math**

Sofia had 20 comic book and gave some of them to Heather.She uses a calculator to figure out that she gave away 0.15 of her comic book.How many comic book did she give to Heather!

*May 31, 2016*

**Physics**

A transverse wave traveling in a string takes 1.40 s to move 13.2 m. The mass of a 8.50 m piece of the string is 1.60 kg. What is the tension in the string?

*May 25, 2016*

**Physics**

The string is 0.95 m long with tension 8.00 N. The total mass of the string is 12.34 g. Find the period of the oscillation.

*May 25, 2016*

**my son's math help please**

Aaron baked two identical cakes.He cut one into 9 equal slices and the other into 18 equal slices.Which is greater 2/3 of the 9 slice cake or 1/3 of the 18 slice cake?

*May 24, 2016*

**Physics**

The difference in temperature between summer and winter causes the length of a pendulum in a clock to change by one part in 27000. If the period of the pendulum is 1 s, what time-difference error will this make in one hour?

*May 19, 2016*

**Help my son's math**

Tyvm sue

*May 18, 2016*

**Help my son's math**

You are given a choice of having 3/4 of an hour of free time 2/3 of an hour of free time on Friday afternoon.Which option would you choose.

*May 18, 2016*

**algebra 2b**

A simple random sample of 50 adults was surveyed, and it was found that the mean amount of time that they spend surfing the Internet per day is 54.2 minutes, with a standard deviation of 14.0 minutes. What is the 99% confidence interval (z-score = 2.58) for the number of ...

*May 17, 2016*

**help my son's math**

Dan baked enough peach pies for each of his 20 friends to have 1/8 of a pie. How many pies did he bake.

*May 9, 2016*

**Help my son's math**

Thank u very much

*May 4, 2016*

**Help my son's math**

A TRAIN IS TRAVELING AT A RATE OF 76KM EACH HOUR . ESTIMATED THE TIME IT WILL TAKE THE TRAIN TO TRAVEL 399KM??

*May 4, 2016*

**Physics Please Help!**

A small metal ball with a mass of m = 78.9 g is attached to a string of length l = 1.76 m. It is held at an angle of = 44.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...

*May 3, 2016*

**Physics**

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. (Image included with problem) The target box is 2.44 m horizontally from the edge of the table. Bobby compresses the ...

*May 3, 2016*

**Physics**

Consider an archery bow as behaving like a spring with a spring constant of 493 N/m. If an archer pulls the bowstring back for a distance of 42 cm, what is the elastic potential energy of the "loaded" bow? If the mass of the arrow is 39 grams, what is its speed as it...

*May 3, 2016*

**Physics**

Consider an archery bow as behaving like a spring with a spring constant of 493 N/m. If an archer pulls the bowstring back for a distance of 42 cm, what is the elastic potential energy of the "loaded" bow? If the mass of the arrow is 39 grams, what is its speed as it...

*May 3, 2016*

**Physics**

By how much will a 1.52 kg object stretch a spring that is suspended vertically if the spring constant is 135 N/m? The object is pulled straight down by an additional distance of 25.4 cm and released from rest. Find the speed with which the object passes through its original ...

*May 3, 2016*

**Physics**

Use the following information to calculate the speed of a ball in a pinball machine at a specific location. The ball is launched by using a spring (k = 700 N/m) compressed by 8.5 cm. Consider the starting position of the ball to be its location when the spring is compressed. ...

*May 3, 2016*

**Physics**

A bullet (m = 0.0250 kg) is fired with a speed of 94.00 m/s and hits a block (M = 2.20 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. Find the angle (in degrees) through which the block rises, if the strings are 0.200 ...

*May 3, 2016*

**Physics**

A small metal ball with a mass of m = 78.9 g is attached to a string of length l = 1.76 m. It is held at an angle of = 44.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head-on and perfectly elastically with an ...

*May 3, 2016*

**Physics**

The target box is 2.44 m horizontally from the edge of the table. Bobby compresses the spring 1.42 cm, but the center of the marble falls 84.0 cm short of the center of the box. How far should Rhoda compress the spring to score a direct hit?

*May 3, 2016*

**Physics**

A fighter jet is traveling at 200 m/s following the arc of a vertical circle of radius R. At the top of its path, the pilot experiences “weightlessness.” What is the value of R?

*May 2, 2016*

**Calculus**

Sketch the region enclosed by the curves given below. Decide whether to integrate with respect to x or y. Then find the area of the region. y=4cos(x),y=4−8x/π. I thought it was the integral of 4cos(x)- the integral of 4- 8x/π on the interval 0 to π/2. This...

*April 27, 2016*

**Chemistry**

Which of the following is a stronger lewis base: cyanide ion or dicarbide ion? I'm assuming it is the dicarbide ion as it is more negatively charged and a compound consisting of 2 carbons is larger and therefore more likely to lose electrons than something consisting of ...

*April 22, 2016*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...

*April 19, 2016*

**Physics**

In the Biomedical and Physical Sciences building at MSU there are 135 steps from the ground floor to the sixth floor. Each step is 16.0 cm tall. It takes 5 minutes and 40 seconds for a person with a mass of 63.9 kg to walk all the way up. How much work did the person do? What ...

*April 19, 2016*

**Chemistry**

What is the molar solubility of Mg(OH)2 in a solution containing 0,10 M NH3 ? Ksp Mg(OH)2 = 1.2x10^-11 Kp NH3 = 1.8x10^-5

*April 18, 2016*

**Chemistry**

What is the molar solubility of Mg(OH)2 in a solução containing 0,10 M NH3 ? Ksp Mg(OH)2 = 1.2x10^-11 Kp NH3 = 1.8x10^-5

*April 18, 2016*

**Physics**

A car is moving such that its kinetic energy is 6.20×105 J. The car accelerates and the engine does 2.90×105 J of work to accelerate the car. What is the final kinetic energy of the car? Ignore energy lost to friction. (Your answer must be accurate to at least 1%. ...

*April 15, 2016*

**Physics**

A man pulls a crate of mass 61.0 kg across a level floor. He pulls with a force of 186.0 N at an angle of 22.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 120.0 N. If the crate starts from rest, ...

*April 14, 2016*

**Physics**

A car (m = 610.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 49.0 m. Find the average power the engine must deliver to reach a speed of 24.7 m/s at the top of the hill in 20.5 s(NEGLECT frictional losses: air and rolling, ...)

*April 14, 2016*

**Chemisty**

An ideal gas with an initial volume of 96L, temperature of 277K, and 7.3mol is permitted to come to a second state with a volume of 450mL and a temperature of 203C. Show the calculation for the final number of moles of gas in the system. (P1)(V1)/(n1)(T1)=(P2)(V2)/(n2)(T2) (P1...

*April 10, 2016*

**Math**

A 1963 Chevy Bel Air a classic car today, cost $2400 new in mid 1963. How much would that be in 2012 dollars?

*April 8, 2016*