Tuesday

October 25, 2016
Total # Posts: 1,926

**maths**

By making the substitution u=ln x show that the following equation has exactly one real-number solution: -12/ln x + ln x^4 = -9

*October 25, 2016*

**maths**

(a) Let u=7^x. Using the rules for powers show that i) 7^x-1 = u/7 and ii) 7^2x-1 = u^2/7 (b) By making the substitution u=7^x and using part (a), derive a hidden quadratic equation 7^2x-1 +4×7^x-1 - 1/14 = 0 and hence find all solutions to the above equation.

*October 25, 2016*

**maths**

(a) Solve the following equations for x where possible, giving your solutions correct to three decimal places. (i) 3^x+1 -1=5 (ii) 3×4^x =4×4^1-2x (b) Confirm that any solutions you found in part (a) are (approximately) correct by sub-situiting into the original ...

*October 25, 2016*

**maths**

Write down the sum and product of the roots of the following quadratic polynomials: (a) 3x^2 - 6x - 7 (b) 3x^2 + 6x + 7

*October 25, 2016*

**maths**

Determine the nature of the roots of the following quadratic equations: (a) 3x^2 - 6x + 7 = 0 (b) 3x^2 + 6x - 7 = 0 (c) -5x^2- x/5 = 0 (d) 4x^2 - 28/3x + 49/9 = 0

*October 25, 2016*

**maths**

Solve the simultaneous questions: (a) x+y+z=-3 (1) x-y-2z=13(2) y-4z=25 (3) (b) x+2y+3z=-14 (1) 2x+3y-z=13 (2) 3x-y+2z=-7 (3)

*October 25, 2016*

**maths**

1a) Solve the each of these equations by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 (b) For each question in part (a), check your solutions by substituting them back into the equation. 3. Solve each equation ...

*October 25, 2016*

**maths**

Write down the sum and product of the roots of the following quadratic polynomials: (a) 3x^2 - 6x - 7 (b) 3x^2 + 6x + 7

*October 24, 2016*

**maths**

Determine the nature of the roots of the following quadratic equations: (a) 3x^2 - 6x + 7 = 0 (b) 3x^2 + 6x - 7 = 0 (c) -5x^2- x/5 = 0 (d) 4x^2 - 28/3x + 49/9 = 0

*October 24, 2016*

**maths**

Solve the simultaneous questions: (a) x+y+z=-3 (1) x-y-2z=13 (2) y-4z=25 (3) (b)x+2y+3z=-14 (1) 2x+3y-z=13 (2) 3x-y+2z=-7 (3)

*October 24, 2016*

**maths**

1a) Solve the each of these equations by factorising the left hand side into a product of linear factors: (i) x^2 - 6x - 40 = 0 (ii) 3x^2 + 20x - 7 = 0 (b) For each question in part (a), check your solutions by substituting them back into the equation. 3. Solve each equation ...

*October 24, 2016*

**history**

Article I, Section 8 of the U.S. Constitution grants Congress the power to do all of the following EXCEPT ____.

*October 11, 2016*

**Jefferson**

A car is traveling at 40 miles per hour. Write a rational expression that gives the time that it takes the car to travel Upper M miles.

*October 10, 2016*

**Math**

How do I arrange these in order from the smallest to greatest 5/6, 7/12, 5/8, 23/48

*October 7, 2016*

**Algebra**

Which property is illustrated by the following statement? 2(-3/9)=(-3/9)2 A. Associative property of addition. B. Commutative property of multiplication. C. Inverse property of multiplication. D. Commutative property of addition.

*September 30, 2016*

**Algebra**

Which property is illustrated by the following statement? 2(-3/9)=(-3/9)2 A. Associative property of addition. B. Commutative property of multiplication. C. Inverse property of multiplication. D. Commutative property of addition.

*September 30, 2016*

**Algebra**

Which property is illustrated by the following statement? 2(-3/9)=(-3/9)2 A. Associative property of addition. B. Commutative property of multiplication. C. Inverse property of multiplication. D. Commutative property of addition.

*September 29, 2016*

**Algebra**

Which property is illustrated by the following statement? 2(-3/9)=(-3/9)2 A. Associative property of addition. B. Commutative property of multiplication. C. Inverse property of multiplication. D. Commutative property of addition.

*September 28, 2016*

**Algebra**

Which property is illustrated by the following statement? 2(-3/9)=(-3/9)2 A. Associative property of addition. B. Commutative property of multiplication. C. Inverse property of multiplication. D. Commutative property of addition.

*September 28, 2016*

**math**

each student needs 2/5 of a cup of play dough to build a house. How many cups of play dough are needed for 9 students?

*September 22, 2016*

**science**

how much force is needed to accelerate a 7.1 kg skier at 4 m/s/s?

*September 13, 2016*

**Government**

1. Which of the following is true about the formal amendment process for the Constitution? A. Only citizen may propose an amendment. B. Only Congress may propose an amendment. C. Both houses of Congress may pass a resolution to propose an amendment. D. The president can Vito ...

*September 12, 2016*

**Geometry**

Do you go to Connections academy in the 10 th

*September 6, 2016*

**American government**

That's your problem. Get your own amswers and stop trying to cheat.

*September 1, 2016*

**math**

Indira reacts that the actual difference of 19-7.82 will be greater than the estimate of 19-8=11.Is Indira correct?Explain how Indira might have arrived at the prediction without subtracting the actual numbers.

*August 24, 2016*

**English**

Robert Borden

*August 12, 2016*

**6**

The pet store aquarium holds 32 fish. Today 13 angelfish and 19 are clownfish to the total number of fish in the aquarium

*August 8, 2016*

**Calculus AB**

A rectangle is inscribed in a right triangle with legs of length 5 and 12. The sides of the rectangle are parallel to the legs of he triangle. Find the dimensions of the rectangle that has the largest area?

*July 30, 2016*

**Calculus AB**

A 5.5 foot man walks away from a 12 fokt lampost at a constant speed. At a given moment, let l be the length of the man's shadow (along the ground) and ket x be his distance from the lampost. Sketch a figure that represents the problem Express l in terms of x

*July 30, 2016*

**Calculus AB**

The height h of a closed cylindical tank is 4 times longer than he radius r. Write the volume of the tank as a function of r. Write the total surface area of the tank in terms of h.

*July 30, 2016*

**Calculus AB **

Water pours at a constant rate into a conical tank of height 10 feet and radius 4 feet. Let V, h and r be the volume, height, and radius if the water in the tank at a particular time t. Express the volume of the water in the tank at any time t as a function of h only.

*July 30, 2016*

**Calculus AB**

Let f be the function that is given by f(x)=(ax+b)/(x^2 - c). It has the following properties: 1) The graph of f is symmetrical with respect to the y-axis 2) The graph of f has a vertical asymptote at x=2 3) The graph of f passes through the point (-1,3) Determine the values ...

*July 30, 2016*

**Calculus AB**

Theta is an angle between the lines L1 and L2 with the slopes m1 and m2. Prove that tan theta= (m2 - m1)/(1+m2m1).

*July 30, 2016*

**Calculus AB**

If r and s are roots of the pokynomial equation x^2 + bx + c, show that b=-(r+s) and c=rs

*July 30, 2016*

**Calculus AB**

Solve graphically (x-2)^3(x+4)(3-x)^2(x+1)^4 <0

*July 30, 2016*

**Calculus AB**

A hiker walks due east for 40 minutes, then changes course by going South 25 degrees West. After 20 minutes, he changes course again, this time at South 75 degrees East. He goes through this path for one hour after which he heads north reaching his final destination in 15 ...

*July 30, 2016*

**Calculus AB**

One of the equal angles of an isosceles triangle is 55 degrees. If the base is 20 cm, what is the perimeter and the area?

*July 30, 2016*

**Calculus AB**

Thanks a bunch. And I got 4.967 meters as the final answer based off of what you gave me.

*July 30, 2016*

**Calculus AB**

From a height of 10 meters in the third floor of an apparent that building, the angle of depression of two cars moving on the same lane and in the same lane and in the same direction measure 29.5 degrees and 38.2 degrees. How far are the two cars from each other? This ...

*July 30, 2016*

**Calculus AB**

What is an algebraic expression for cot(arccos ((x+1)/2)?

*July 30, 2016*

**Calculus AB**

Without using a calculator, what is the exact value of sec(arctan(12/5)) - sin(arccot(3/4))

*July 30, 2016*

**Math CSET**

A student scores 96 on a test. The class average is 84, with a standard deviation of 4 points. What percentage of the class scored below this student? I understand the 96-84/4 part to obtain a z-score of 3. What I do not understand is, if I do not have access to a z-score to ...

*July 21, 2016*

**Maths**

if a spinner is divided into 6 equal parts ,when it's spun, what is the probability of spinning on 4?

*July 13, 2016*

**Physics**

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was 10.5Sin(67.6...

*July 5, 2016*

**Physics**

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was 10.5Sin(67.6...

*July 5, 2016*

**physics**

one cubic meter of water hass a mass of 1.0x10^-3. (a) determine the mass of 1.0 m^3. (b) assu!ing biological substance are 98% water, estimate the mass of cell with a 1.0 micrometer dia!eter, a human kidney and a fly. assume a kidney is roughly a sphere with radius of 4.0 cm...

*June 18, 2016*

**Physics**

16.8seconds

*June 12, 2016*

**Physics**

16.8mm

*June 12, 2016*

**Physics**

A 10 kg block is towed at a 30° incline with respect to the horizontal the rope is parallel to the incline and has attention 100 N assume that the block starts from rest at the bottom of the hill and neglect friction how fast is the block moving after 40 m up the hill

*June 8, 2016*

**pre-algebra**

is (-1, 5) a solution to 2 x = y - 7 and 2 y = - x + 9

*May 24, 2016*

**IT**

why is system Burn-in important?

*May 15, 2016*

**math**

Find dy/dx and d2y/dx2. x = e^t, y = te^t

*May 2, 2016*

**Life orientation**

Describe the three human rights violations

*April 17, 2016*

**English**

As the world influence shift so will the language. To teach a language is to aid communication between individuals. Its not whether there is a right or wrong. For example there can be a mathematical language with its own vocabulary that allows mathematicians to communicate ...

*April 14, 2016*

**social studies**

What they are referring to is the battle at the Alamo which is in San Antonio TX. During this time a 100 Texas soldiers fought against approximately 1,500 Mexican soldiers. The did loose however after 10 DAYS, they had killed or injured more then 600 Mexican Soldiers. From ...

*April 14, 2016*

**PHYSICS**

please show step by step!

*April 14, 2016*

**PHYSICS**

Point A is 2.0 meters away from a charge of -3.o(Mu) and 3.0 meters away from a charge of +1.5(Mu) as shown. A) Find the net Electric field at point A B) Find the total electric potential at point A Answer This Question

*April 14, 2016*

**Physics**

A 1.4 kg box that is sliding on a frictionless surface with a speed of 10 m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. (a) How far will the spring be compressed in stopping the box? (b) How far will the spring be compressed when the box'...

*April 10, 2016*

**factoring polynomiald**

8b(2power)+ 6b +1=

*April 10, 2016*

**science:chemistry**

magnesium trioxocarbonate (IV) decomposed according to the equation MgCO3(s) -MgO2(s) + CO2(g).if 6.0g of magnesium trioxocarbonate (IV) is completely decomposed ,calculate :i. the mass of carbon (IV) oxide produced

*April 6, 2016*

**Physical science 7th grade**

What is the internal structure of the cavefish and the minnow suggest common ancestry?

*April 2, 2016*

**He**

which organ is part of both the respiratory and digestive systems

*April 1, 2016*

**Health**

the main parts of the central nervous system consist of the brain and the

*April 1, 2016*

**Health**

why does the blood returning to the heart have very little oxygen in it

*April 1, 2016*

**Math**

If the ratio of red cars to Blue Cars is 3 to 5 and there are 55 blue cars how many red cars are there?

*March 30, 2016*

**owens**

i need help in writing an essay for more details- bit.ly/21OERpv written in APA style

*March 29, 2016*

**Check My Answer! :)**

What is the surface area of the square pyramid if the altitude is 4 cm, the length is 6 cm, and the height is 5 cm? a. 48 cm^2 b. 144 cm^2 c. 156 cm^2 d. 96 cm^2 i think the answer is 144 cm^2. Please show me how you did the work so then i know that i at least got partial ...

*March 29, 2016*

**Chemistry**

What is the total mass of KNO3 that must be dissolved in 50 g of water at 60 degree C to make a saturated solution?

*March 22, 2016*

**mathematics**

A train takes 5mins to cover a distance of 3km between two stations P and Q. Starting from rest at P, it accelerates at a constant rate to a speed of 40km per hour and maintains this speed until it is uniformly brought to rest at Q. If the train takes three times as long to ...

*March 14, 2016*

**Inorganic Chemistry**

In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....

*March 11, 2016*

**Inorganic Chemistry**

In a constant-pressure calorimeter, 70.0 mL of 0.340 M Ba(OH)2 was added to 70.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.00 °C to 26.63 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....

*March 11, 2016*

**Inorganic Chemistry**

A researcher studying the nutritional value of a new candy places a 4.70-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.98 °C. If the heat capacity of the calorimeter is 39.80 kJ·K–1, ...

*March 11, 2016*

**Math**

Write a story problem to represent six divide by 1/5

*March 9, 2016*

**Life orientation**

no wrong

*March 8, 2016*

**Bussiness management**

hiiiiiiiii

*March 8, 2016*

**math**

Mike had a jar of nickels that had five more nickels than he originally thought. If the total amount of nickels was $4.35, how many nickels did Mike think he had originally?

*March 5, 2016*

**math**

James wants to buy a 50-inch flat-screen television, and the model he wants costs $1,200. So far, he has saved $700, but still needs $500 more. The bank where he has a checking and savings account will loan him $500 at 12% annual interesting using a 90-day promissory note. ...

*February 29, 2016*

**math**

$12,500 x 2 = confused about the rest.

*February 29, 2016*

**math**

After purchasing the apartment, Seth receives a street, sewer, and gutter assessment for $12,500 due in 2 years. How much would he have to invest today in a CD paying 2%, compounded semiannually, to fully pay the assessment in 2 years?

*February 29, 2016*

**math**

can't figure this out please somebody help me i'm not good at math how do i do the calculations

*February 29, 2016*

**math**

A friend of Seth’s who is a real estate developer needs to borrow $80,000 to finish development project. He is desperate for cash and offers Seth 18%, compounded monthly, for 2 ½ years. Find the future value of the loan using the future value liable. Does this loan...

*February 29, 2016*

**math**

After looking at the results from questions 1, and 2. Seth realizes that a 2% return in a certificate of deposit will never allow him to reach his goal of $1 million in 10 years. Presuming his apartment will indeed be worth $400,000 in 10 years, compute the future value of ...

*February 29, 2016*

**math**

how do i figure this answer out im confused

*February 29, 2016*

**math**

. Seth’s current bank offers a 1-year certificate of deposit account paying 2% compounded semiannually. A competitor bank is also offering 2%; but compounded daily. If Seth invests the $100,000, how much more money will he have in the second bank after one year, due to ...

*February 29, 2016*

**math**

Find the finance charge on a credit card with an average daily balance of $465 if the rate charged is 1.25%.

*February 29, 2016*

**math**

An electric mixer was purchased on the installment plan for a down payment of $60 and 11 monthly payments of $11.05 each. The cash price was $170. Find the annual percentage rate.

*February 29, 2016*

**math**

Find the amount of money that Keaton and Jana Smith must set aside today so that they will have $5,000 available to buy a home security system to one year if the annual interest reate is 5% compounded annually.

*February 29, 2016*

**math**

Manually calculate the compound interest on a 13% loan of $1,600 for three years if the interest is compounded annually.

*February 29, 2016*

**math**

Alice Dubois was charged $455 in finance charges on a loan for 15 months. Find the finance charge refund if she pays off the loan in full after 10 payments.

*February 28, 2016*

**Chemistry**

Pyridine, a substance used as a catalyst in some synthetic reactions is a very weak base its degree of ionization is equal to 0.03% in solution 0.02 mol L -¹. Determine the ionization constant.

*February 23, 2016*

**Chemistry**

The methane gas is formed by 25% hydrogen in mass which the ratio between the mass of carbon and hydrogen in this gas?

*February 22, 2016*

**PLEASE MATH**

Giuseppe purchases an Internet, Inc $100,000 bond at 102.25 that pays 3.5% What is the (A)cost of the bond (B) Annual interest and (C) annual yield?

*February 17, 2016*

**Cal 2**

The region bounded by y=3/x, y=0, x=3, and x=5 is rotated about the x-axis. Find the volume of the resulting solid.

*February 10, 2016*

**Cal 2**

Find the volume of a frustum of a right circular cone with height 25, lower base radius 30 and top radius 13.

*February 10, 2016*

**Math**

What is the formula The value of Dave's Camaro decreased by 30%. The car is worth $14,000. What was the purchase price?

*February 6, 2016*

**Physics**

A hollow sphere has a uniform volume charge density of 2.22 nC/m3. The inner radius is a = 12.2 cm and the outer radius is b = 24.4 cm. What is the magnitude of the electric field at 18.3 cm from the center of the sphere? What is the magnitude of the electric field at 78.1 cm ...

*February 2, 2016*

**math**

In my math class tests are 70% and homework is 30% so if i wanted at least an 80% how much would be the least percentage i needed in each category

*February 1, 2016*

**math**

In my math class tests are 70% and homework is 30% so if i wanted at least an 80% how much would be the least percentage i needed in each category

*February 1, 2016*