# Posts by grace

Total # Posts: 667

**Biochemistry**

Calculate the ph of a 1L solution to wgich has been added 25ml of 10mM acetic acid and 25ml of 30mM sodium acetate

**Geography**

Can anyone help me with this question: What is the time given to each longitude? I don't understand what it means. Please help!

**MATH**

IF FENCING IS $12 A METRE HOW MUCH WILL A FENCE COST

**algebra **

The ordered pairs (1, 81), (2, 100), (3, 121), (4, 144), and (5, 169) represent a function. What is a rule that represents this function?

**math**

what amount was borrowed for which the amount of interest is $ 200 at the rate of 5% for 4 years.

**algebra**

If Mr.Chiko earns N$ x in a week and spend N$ y, what part of his weekly salary did he save?

**math**

Water is being poured into a conical cup that is 12cm tall. a) When the water in the cup is 9cm deep, what percentage of the cup is filled? b) When the cup is 75 percent filled, how deep is the water?

**Physics**

Thank you so much!

**Physics**

I just realized I messed up when I was calculating the time. After going back and fixing it, I got that d= about 7.1 m. So if this is correct, then yes the person will reach the pool.

**Physics**

Oh yes, I do know that. I think I was just overthinking it because I saw the 'assume no air resistance', that always trips me up. I got d= 11.05 m

**Physics**

So t= 2.21 s? I'm confused on if there is a specific formula I need to use or not?

**Physics**

A person runs off a 10.0-meter high balcony in a horizontal direction at 5.0 m/s. The swimming pool is at ground level 5.5 meters away from the edge of the balcony. Will the person reach the pool? Assume no air resistance. *I'm having trouble with this question. I've ...

**math**

the illustration is a rectangular box sitting on the x and y plane and one of the corners is on (0,0,0). the far corner of the box is (3,6,4).

**math**

The illustration at right shows a rectangular box, three of whose edges coincide with the coordinate axes, and one of whose vertices is (3, 6, 4). Give an equation for the plane containing the front face of the box. Do the same for the top and right faces.

**math**

hi I reposted this question to see if I would get the answer the person who posted this one last time says that 9sqrt3 is wrong (and I check if they were right) do here is the question again Given: ?PQR, m?R = 90° m?PQR = 75° M ? PR (meaning that m in on segment PR) , ...

**Social**

Why do you think such widespread discrimination was socially acceptable back then and is not today?

**Social**

No.

**Social**

I really don't know

**Social **

Why western countries such as canada and britain favoured appeasing Hitler? Why did appeasement ultimately fail!

**Art:Please Help Me @Ms Sue**

Thanks so much helpman I got 100%

**math**

Given: ?PQR, m?R = 90° m?PQR = 75° M ? PR , MP = 18 m?MQR = 60° Find: RQ M is on segment PR 9sqrt3 is wrong(the system did not take it)

**MATH AGAIN**

Given: ?ABC is isosceles m?ACB = 120° m?BMC = 60° CM = 12 Find: AB M is on line segment AB

**math**

I MEANT AB SORRY

**math**

Given: ?ABC is isosceles m?ACB = 120° m?BMC = 60° CM = 12 Find: AB M is on line segment PR

**math**

Given: ?PQR, m?R = 90° m?PQR = 75° M ? PR , MP = 18 m?MQR = 60° Find: RQ

**math**

on line segment PR

**math**

One of the numbers increased by 10. How did the average of the two numbers change?

**math**

HELP PLEASE!!!!

**math**

Graph the equation y = 1 + 2 sin x. This curve crosses the x-axis in several places. Identify all the x-intercepts with 0 < x < 360.

**math**

Consider a billion-sided regular polygon that is circumscribed around a circle of radius r; how are its area and perimeter related?

**math**

ms. sue plz help

**math**

On the sphere x^2+y^2+z^2 = 13^2, there are many great circles that intersect at (3, 4, 12). Find coordinates for the other point where these circles all intersect.

**Physics**

Okay, I used Fc=mv^2/r and got 690.14 N. I used 83.6kg for m, 7574 for v, and 6,949,000 for r. Does that sound right? Thanks.

**Physics **

Sputnik, the first artificial satellite to orbit the Earth, had a mass of 83.6kg and travelled at 7574 m/s. The radius of the earth is 6371 km and its mass is 5.972 x 10^24 kg. What gravitational force did Sputnik apply to the earth during this orbit? What I've got so far...

**Physics**

I have already calculated the mass using volume multiplied by density and the resulting answer was incorrect. However, I just realised that I had forgotten to convert the mass from grams to kilograms. Thanks for your help.

**Physics **

Hi, the following is a problem that concerns angular momentum: Modern hard drives spin very fast! The part that holds the data is a disk called the platter. Assume an aluminum platter that is 3.5in. in diameter, 1mm thick, and spinning at 5400 rpm. Treat the platter as a solid...

**Physics **

Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum on Earth is l, what should the ...

**math**

ok...I got b=0, a=5/24, c=19/24 is that right?

**math**

oh sorry P=(-1,1)

**math**

There is a unique parabola that goes through the points P = ( 1, 1), Q = (1, 1), and R=(5,6) that can be described by y=ax^2 +bx+c. Find coefficients a, b, and c.

**Math**

By letting x=5^y, show that the equation p5^y + 5^-y = 5 can also be written as px^2-5x+1 = 0

**Mathematics**

Solve the simultaneous equation: x^2 + y^2 = 13 and x + 3y = -3

**math**

Without using a calculator, choose (a) the larger of cos 40 and cos 50; (b) the larger of sin 40 and sin 50. Be prepared to explain your reasoning.

**Math**

How many pieces 3/7 of a foot each can I make out of 7/2 feet of rope?

**PLEASE HELP**

Find the volume of a cone of height 8 centimeters and base radius 6 centimeters. This cone is sliced by a plane that is parallel to the base and 2 centimeters from it. Find the volumes of the two resulting solids. One is a cone, while the other is called a frustum.

**math**

Sasha has 8 red apples. She has 3 fewer green apples than red apples. How many apples does she have? 13 apples 8-3=5 green 8+5=13

**riddle**

Its new and old at the same time

**Science**

The offspring will have black fur because BB Bb Bb bb because there is a 75% chance of getting black fur since on one is recessive. The answer is black fur.

**Honors English 9**

What are examples of characterization in Antigone? This is a review question in a small packet that follows every book. I have no recollection of reading direct characterization and our books are taken at the end of each quiz.

**Chemistry**

The specific heat of silver is 0.24 J/g*C. If 15.4 g of silver absorb 332 J heat, how much will the temperature of the silver increase?

**biology**

There is a 25% of the offspring being red because... BB Bb Bb bb

**Physics**

A cardboard box of unknown mass is sliding upon a mythical frictionless surface. The box has a velocity of 4.56 m/s when it encounters a bit of friction. After sliding 0.700m, the box has a velocity of 3.33 m/s. What is the coefficient of friction of the surface? Am I right to...

**physics**

A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits the ground?

**Check my awns-The true cost of fossil fuels - Quiz**

Thank you so much if you need help!!!! 100% I am literally dancing right now!!!! : ) : ) : ) : ) .. U

**MATH**

If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum

**Math**

Find the asymptote of (3)/(2x^(2)+3)

**Maths**

Find the vertical asymptote of the following curve: (5x+3)/(e^(x)-1)

**Physics**

A force F =(8.700 N)i +(?9.000 N)j F?=(8.700 N)i +(?9.000 N)j is exerted on a particle located at r=(?8.400 m)i +(7.700 m)j r?=(?8.400 m)i +(7.700 m)j. What is the torque on the particle about the origin?

**math**

3n+7=4n-12 4n-3n=7+12 n=19 =

**Math**

The first number is the price of 1 ounce of soda if 64 ounces cost $1.92

**algebra 1**

Susie wants to have at least a 90 average for the year in her Algebra class. Her current test scores are 85, 100, 86, and 97. What does she need to score on her fifth test to have at least a 90 average?

**Chemistry**

What is NaOH?

**Math**

A sample of 120 bags of potatoes produced by a factory was found to have a mean weight of 2.47 kg and a standard deviation of 0.12 kg. Obtain a 95% confidence interval for the mean weight of all bags of potatoes produced by the factory.

**Physics**

Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic friction between the dresser...

**Algebra**

Tire pressure is directly proportional to temp on a temp scale where zero degrees is absolute zero. given that temp in degrees celcius and degrees Fahrenheit are related by the formula F=9/5C +32 and absolute zero is -273.15C, by what % does tire pressure decrease when the ...

**Mathematics**

If we require a margin of error of x% for the sample size n, express n in terms of x.

**Physics**

Never mind, I figured it out as normal force is really simple but the distance part was confusing me. Thanks for reading it anyway.

**Physics**

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

**Math**

X is a normal variable with mean 9. If P(X > 12) = 0.0062, calculate the standard deviation, the standard deviation if X.

**math**

60% of the students in a school are boys. 70% of the boys and 40% of the girls wear glasses, how many students are there in the school?

**Math**

If P(a<X<b) = 0.48 and P(0<X<a) = 3 x P(b<X<12), calculate P(b<X<12) and calculate P(0<X<b).

**history**

explain the relationship of Spindletop's location in Texas to it's importance on the economic development of Texas and the United States.

**Math**

During the Great Singapore Sale, Mr. Chen bought a digital camera for $810. This was 90% of the usual price How much was the discount

**Physics**

You're driving parallel to train tracks at 40.0 km/h when a train passes you, going a steady 105 km/h. A track crossing is up ahead, so you begin to speed up at 6.50 m/s2. How far do you drive before you pass the train?

**Calc AB**

Given y=32t2 +16t+64, what is D2/t [y]? A.-64 B.-32 C.16 D.-64t+6**

**Physics**

A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

**Physics**

A quarter on a spinning vinyl record has a centripetal acceleration of 31.8 m/s2. What is the acceleration of the quarter if it is placed twice as far from the centre of the vinyl record?

**Math**

a pie chart is drawn to represent the numbers x,2x and x+4. If the angle at the centre representing x is 75 degrees, find x

**Maths**

a pie chart is drawn to represent the numbers x,.2x.and x+4. If the angle at the centre representing x is 75 degrees, find x.

**math**

a respie requires 2 cups of flour to make 10 servings and 8 cups of flour to make 40 servings. How many cups of flour are needed to make 30 servings

**Math :)**

A pie chart is drawn to represent the numbers x, x+2 and 8. If the angle at the centre of the sector representing x+2 is 120 degrees, find the value of x.

**Math**

Does expressing a number in scientific notation change the value of the number (being expressed)?

**Math**

A fair eight-sided die is rolled six times. A success is getting a 6, 7 and 8. Find the probability of getting three successes.

**Math**

A fair coin is tossed six times. Find the probability of getting head, head, head, head, tail, tail in that order

**maths**

Seven times a certain number is the same as nine more than four times the same number. Find the number.

**Math**

A bag contains 8 white, 6 black and 4 red discs. They are selected at random and not replaced. What is the probability that there is at least one black disc in the first four discs drawn out of the bag?

**Math**

Six points lie on the circumference of a circle. How many different triangles can be drawn having some of these points as vertices?

**Math**

A rectangular garden is 30 m long and 20 m wide. A path of uniform width is set around the edge that reduces its area to 375m^2. What is the width of the path?

**English**

Wilfrid Laurier, John A. Macdonald, Queen Elizabeth II, William Lyon Mackenzie King, ______ ______.

**Maths**

Alice & Phillis share some stickers. Alice has 5/7 as many stickers as Phyllis. Phyllis has 92 more stickers than Alice. How many stickers does Alice have?

**Math**

The temperature is 12 degrees lower that 4 hours ago. Write an integer equation for the situation and what is the average temperature change per hour? 12/4= 3 3 degrees is the average temperature change per hour.

**History**

Sorry It should be were the reformation and counter-reformation popular movements OR the carefully orchestrated manipulations of charismatic figures or both?

**History**

were the reformation and counter-reformation popular movements of the carefully orchestrated manipulations of charismatic figures or both? Why?

**chemistry**

You have a solution that contains 0.25g grams of oxalic acid dissolved in 100 mL of water. This solution is placed in a separating funnel, and the 100 mL of butanol is added to the solution. calculate the mass of oxalic acid in the organic solvent

**algebra**

$8000 principle earning 3% componded annually, 4 years. What will be the balance after 4 years?

**science**

PLz help

**science**

which of the following does not change when a car keeps a constant speed but changes direction

**life orietations**

Six ways that the human rights violations influences individuals and the broader south Africa community

**Life orientation**

Examples of human rights violations

**math**

A homeowner is selecting a pool with a perimeter of 54 meter to place in his back gard. Find the perimeter of the pool If the dimensions are cut in half.