# Posts by Kevin

Total # Posts: 1,287

**Math**

What's 9 + 10?

**Chemistry**

How do you calculate the heat gained by the calorimeter after adding aluminium?

**Physics**

A ball is dropped from a height h without air resistance. If the ball falls a distance of h/2 in a time t, how much time is required to fall the remaining h/2? Could you show steps because I don't understand how to work the problem. Thank you.

**Algebra**

Alex is two-fifths as old as Clara. The sum of their ages is 56. How old is Alex?

**physics**

If object B is dropped from a height of 100 m while moving horizontally at 115 m/s. How much time will it take for object B to hit the ground? (round answer to the tenth's place and use "s" to describe your answer)

**PreCalculus**

sin isnt an identity to begin with and i got sin^2 x + cos^2 x = 1 the ansswer says its what i got

**PreCalculus**

Prove the following to be an identity (cotx + cscx)*(1-cosx)=sin x

**chemistry**

Hydroselenic acid in formula form is H2SeO4?

**precalculus**

sin^2 x + cos^2 x = 1 using that, derive what the cot^2 x would equal to. would it be csc^2 x - 1 = cot^2 x

**math**

4cosx + 3 = 0

**S.S.**

Who are the new United States governments of 2017?

**Statistics**

The Jones family was one of the first to come to the U.S. They had 9 children. Assuming that the probability of a child being a girl is .5, find the probability that the Jones family had at least 5 girls.

**Statistics and Probability**

A ticket in a typical lottery like Lotto 6/49 is usually $2. The probability of winning Lotto 6/49 is 1 in 13,983,816. The payoffs (jackpots) are usually in excess of $1 million. Suppose that you buy one ticket for $2 and the jackpot is $1 million. What is your expected value ...

**physics**

The mars rover opportunity approached Mars on January 24th, 2004 and was moving with a velocity of 5.4km/s when it hit the atmosphere on its way to the surface at Miridani Planum. i)convert this speed to miles/hr. ii) If it took the lander 6 minutes to hit the surface of Mars...

**Language Arts**

The black hawk is wrong look at number 3 he said B but thats the stupid answer just look closly at it

**algebra **

identify if the given functions are one to one 1. f(x)=x^3-7x 2. g(x) = square root x-3+1 3. h(x)=4x^4-2x^2+11

**Physics**

An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 34.0 m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air resistance may be ...

**Policy**

What was the Peel Commission and what were the recommendation about Palestine?

**Middle East**

During the Colonial history of the Middle East, what were some of the countries interested in the Middle East?

**Science**

Can someone help me come up with a way the lithosphere and cryosphere interacts? I already have permafrost.

**Geometry **

N is between points M and P. MN = 17 NP = 3y MP = 5y + 9 Find MP.

**Chemistry**

Calculate % of lowering of vapour pressure if 36 g glucose is added in 312g of benzene

**Physics **

Suppose you are provided with 500 dice.calculate the number of throws that is equivalent to one half life and the decay costant for the process.under radioactivity decay analogue experiment

**Physics **

To make ice cubes you fill am ice tray with 150g of water at 20°C. How much energy must be removed from the water to create ice cubes at a final temperature of -10C

**Algebra **

Find the zeros of the function f(x)=(m^2-9)(9m^2+24m+16)

**Algebra**

A rectangle's width is 6 inches less than its length. If it's area is 216 square inches find the dimensions of the rectangle. Write an equation and solve

**Algebra**

A triangle has a height that is 4 inches less than its base. If the triangle has an area of 86 square inches, set up and resolve an equation to find its base and height.

**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

**Math**

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

**History**

Please help me please Mrs. Sue.

**History**

Who are the United States governments of 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.

**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

**Math**

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

**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.

**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"

**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"

**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/...

**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...

**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.

**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?

**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 ...

**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 ...

**Algebra**

Thank you!

**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...

**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 ...

**Foods and Nutrition**

Which foods contain the most protein?

**Physics**

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

**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

**French**

Thank You Ms. Sue

**French**

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

**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

**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?

**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)

**Algebra **

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

**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.

**Math**

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

**riddle**

Time

**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

**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 ...

**Science**

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

**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.

**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?

**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?

**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 ...

**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. ...

**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 ...

**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 ...

**Math**

Here cheater you gave us the wrong awnsers do you know that affects our life i did every qustion by myself abd only 4 compared to yours your messying with our fuctor and its not funny

**Math**

Are thos anwersers right??

**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 ...

**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 ...

**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 ...

**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 ...

**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

**Statistics**

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

**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

**absolute value**

Kevin compared the absolute value of -2 1/8 and -2.25,2 3/8, -2.29,and 2 4/11 Which number has the greatest absolute value.

**Math**

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

**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 ...

**Social Studies**

Guys 5 is c ms.Sue you did great but noy on 5

**math**

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

**Calculus**

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

**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.

**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...

**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...

**PHYSICS/SCIENCE**

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

**Physics/Science**

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

**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

**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

**Chemistry**

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

**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

**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?

**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?

**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

**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?"

**Chemistry**

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

**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...

**Calculus**

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

**Calculus**

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