Saturday

April 19, 2014

April 19, 2014

Total # Posts: 155

**Physics **

A 920kg car is 65m from a concrete barrier, travelling at 125km/h, when the driver notices and slams on the breaks. The frictional force acting on the car is 8500 N. Is ther driver able to stop the car before hitting the barrier.

**chemistry**

A sample of barium contains 3.20g of barium. How many atoms of barium are contained in the sample?

**Calculus**

State the domain and range for each: f(x) = 4x + 1 and g(x) = x^2 f(x) = sin x and g(x) = x^2 - x + 1 f(x) = 10^x and g(x) = log x

**Calculus**

Math questions, please help me? :(? Find the composite functions f o g and g o f for the given functions. f(x) = 10^x and g(x) = log x State the domain and range for each: f(x) = 4x + 1 and g(x) = x^2 f(x) = sin x and g(x) = x^2 - x + 1 f(x) = 10^x and g(x) = log x If f = {(-2...

**Chemistry**

PV=nRT (1)(x)= (.250)(0.0821)(523) 1x= 10.73

**calculus**

F(x)= log_3 (1-5x) F'(x)=

**world history**

how did spain acquire her american empire?

**Algebra 1**

SO HOW DO YOU GET 1/2 FORM THAT?

**Algebra 1**

the quadratic formula is -b+-radical b^2-4ac/a

**Algebra 1**

So technically there would be no solution right?

**Algebra 1**

how do you get 1/2 as a solution?

**Algebra 1**

because the answer has got to be a real number which is not a negative number

**Algebra 1**

solve: log8(w-6)=2-log8(w+15) note: the 8 is to be little at the bottom right corner of log

**Test prep**

solve: log8(w-6)=2-log8(w+15) note: the 8 is to be little at the bottom right corner of log

**Algebra**

Write expression as the logarithm of a single expression or number: ln(3x+2)+ln(x+4)

**Math prep**

1). Using the function: y=y0,(.90)^t-1. In this equation y0 is the amount of initial dose and y is the amount of medication still available t hours after drug is administered. Suppose 20mg of the drug is administered. How long will it take for this initial dose to reach 50mg? ...

**math**

the y0 should actually be y with a little 0 at the bottom right corner and as i said from the equation it is the amount of initial dose. Plus the initial dose is 200mg not 20 sorry. so how long would it take to get from 200mg to 50mg?

**math**

1). Using the function: y=y0,(.90)^t-1. In this equation y0 is the amount of initial dose and y is the amount of medication still available t hours after drug is administered. Suppose 20mg of the drug is administered. How long will it take for this initial dose to reach 50mg? ...

**physics **

A hypodermic needle is 2.98 cm in length and 0.28 mm in diameter. What pressure difference between the input and output of the needle is required so that the flow rate of water through it will be 1 g/s?

**Fifth grade English**

What is the plural form of staff? Not sure if it should be staff or staffs. Thank you for helping. Britt

**5th grade English**

What is the simple predicate in this sentence? The lion is nicknamed the King of the Beasts. Would it be "is" or would it be "is nicknamed"? Thanks!

**9th grade algebra/Ms Sue**

.78 to nearest hundred

**algebra**

-5/8- 3/4=

**chemistry**

the rusting of iron is represented by the eqquation 4Fe + 3O2 --> 2Fe2O3 if you have a 1.25-mol sample of iron, how many moles of Fe2O3 can be made?

**history**

How did George Kennan’s containment doctrine change during the Truman, Eisenhower and Kennedy administrations? Which president was the most successful in containing Communism? HELP!!!

**chemistry**

The electron pairs in a molecule of NH3 form a tetrahedron. Why does the NH3 molecule have a trigonal pyramidal shape rather than a tetrahedral shape? Explain your answer. PLEASE HELP

**Calculus**

Total cost to manufacture q microwaves a day is C(q)=3q^2+q+48.What level of product gives the least average cost and Can a microwaves be produces for less than $30?

**history**

How was the civil rights movement of the 1950s and 1960s a continuation of the Reconstruction-era struggle for blacks to achieve equality?

**history**

How was the civil rights movement of the 1950s and 1960s a continuation of the Reconstruction-era struggle for blacks to achieve equality?

**chemistry**

Based on electronegativity values, which bond has the highest degree of ionic character: H--S Si--Cl Cs--Br?

**science**

How do you figure out if acceleration occurred. What would the equations look like?

**science**

you are riding your bike at 9km/h. ten minutes later; your speed is 6km/hr.

**science**

91km/h

**science**

What is the average speed of a car that travels 320km in 3.5 hours?

**chemistry**

Ammonia, NH3, can be made by reacting nitrogen with hydrogen. N2 + 3H2 = 2NH3 How many moles of NH3 can be made if 7.5 moles of H2 react with enough N2? Please help!

**University Physics**

Building A and Building B are 30m away from each other, on the 4th floor; 35m high, someone has set up a slingshot from the window on the 4th floor of building A and is trying to sling a balloon into the window directly across from them in building B. the balloon weights 1 kg,...

**history**

french and indian war

**history **

Discuss the importance of landscape in crafting battle strategy for both the French and the English. Help please! talking in general.. no one specific battle

**calculus**

Solve for x: 2x=ex+1

**calculus**

Solve the equation 14=65(19)x for x using logs.

**trigonometry**

Use De Moivre’s Theorem to simplify each expression. Write the answer in the form a + bi. {1 - i(/3)}^4

**accounting**

Christy Burch and Myung Lim, partners, compared their current income statement with their income statement of a year ago. They noted that sales were 12.0% higher than a year ago. They also noted that the total expenses were 20.0% higher than a year ago. What type of analysis s...

**trigonometry**

Find a complex number a + bi such that a^2 + b^2 is irrational. Justify and explain your reasoning.

**trigonometry**

Find a complex number a + bi such that a^2 + b^2 is irrational. Justify and explain your reasoning.

**english**

The Awakening, by Kate Choplin, sorry

**trigonometry**

okay!

**trigonometry**

ohh, i didnt realize! thankyou :)

**trigonometry **

{1/(sec x - 1)} - {1/(sec x +1)} = 2 cot^2 x solve using identities?

**trigonometry **

Use identities to simplify each expression. 1) (sin2t) (cos5t) + (cos2t) (sin5t) 2) {1/(sec x - 1)} - {1/(sec x +1)} = 2 cot^2 x

**trigonometry **

1) (sin2t) (cos5t) + (cos2t) (sin5t) 2) {1/(sec x - 1)} - {1/(sec x +1)} = 2 cot^2 x

**trigonometry **

A sheet metal worker constructed a triangular metal flashing with sides of 6 ft., 5 ft., and 3 ft. If he charges $2 per square foot for this type of work, then what should he charge? Do not use Heron’s formula. Justify and explain your reasoning.

**math**

I have spent hours trying to do these, help! Use the given information to solve the triangle. 1) C = 145 degrees, b = 4, c = 14. 2) A = 150 degrees, C = 20 degrees, a = 200.

**trigonometry **

Use the given information to solve the triangle. 1) C = 145 degrees, b = 4, c = 14. 2) A = 150 degrees, C = 20 degrees, a = 200.

**English**

Which of the following are characteristics of allegory? A. Immitation B. Humor C. Didacticism D. Spiral Plot C. Music

**math**

what is the sum of radical x- 1 and (x-1)^2 when x= 5?

**calculus**

The volume V of a cylinder is computed using the values 9.8 \text{m} for the diameter and 3 \text{m} for the height. Use the linear approximation to estimate the maximum error in V if each of these values has a possible error of at most 8 \%.

**Precalculus**

Can an even degree polynominal have exactly one x intercept?

**Math**

Find cos(theta) if (-15, 8) is a point of the terminal side of theta.

**physical science **

can water dissolve polar molecules or nonpolar molecules

**Math**

Rectangle with a diagonal length oh 26m and height of 10m

**Math**

What is the area of a square with a diagonal length of 15 times the square root of 2?

**algebra**

x squared-4x-5 your factoring each expression.

**Math**

Find (f-g)(-3) when f(x) = x + 3 and g(x) = sq. rt. x - 7

**Science**

Identify two different types of green power. Identify a disadvantage and advantage of each type. Thanks Britt

**chem**

I did this same problem on Sapling Learning and I can confirm Anonymous's answer is correct. Now, if only someone can explain why it makes sense. Is it just comparing pKa values?

**psychology**

Explain how influences from each of the 4 levels of the ecological perspective have affected your development thus far (8 pts). List the level and then write a few sentences explaining how it has affected you.

**Psych**

I've seen adolescents with such a strong sense of their own importance, especially in sports, that they don't appear to care about anyone or anything else. What do you think?

**Social Studies **

The First Amendment does not guarantee absolute freedoms or rights Why?

**calculus**

it's x=pi.

**calculus**

what is the slope of the curve y=tan(6x^2) when x=ð

**English**

THe meaning would probably be to give a chance. To give it a try! I am going to go too a english club. Hope I helped!

**Chemistry**

If the pressure on a 1.04 L sample of gas is doubled at the constant temperature, what will be the new volume of the gas?

**Chemistry**

668= 26.7(2.42)(X-32.5) ?

**Physics**

A cheetah is hunting. Its prey runs for 2.56 s at a constant velocity of +10.02 m/s. Starting from rest, what constant acceleration must the cheetah maintain in order to run the same distance as its prey runs in the same time?

**statistics**

suppose that 52percent of us sleep between 7 and 8 hours a day .find the decimal for 51 percent

**pysics**

a school bus takes 0.530 h to reach the school from your house. if the average velocity of the bus is 19.0 km/h to the east, what is the displacement?

**physical science**

8.92

**algebra**

(-1, 2) (7, 6) (-3, 2) (5, 5)

**algebra**

Select the ordered pair from the choices below that is a solution to the following system of equations: 4y = 2x + 10 8x - 3y = -14

**Trigonometry**

I am trying to help my child out with a problem but yeah I am finding it veyr hard. Gabe is spending two weeks on an archaeological dig. He finds a fragment of a circular plate that his leader thinks may be valuable. The arc length of the fragment is about 1/6 the circumferenc...

**Finance**

A CBS bond with a par value of $1,000, an interest rate of 7.625 percent, and a maturity of 10 years The bond is selling for $986. The required rates of return is 6 percent for the bond.

**PHYSICS!**

A 0.15 kg ball of dough is thrown straight up into the air with an initial velocity of 13 m/s. (a) Find the momentum of the of dough at its maximum height. kg·m/s upward (b) Find the momentum of the ball of dough halfway to its maximum height on the way up. kg·m/...

**physics**

A 1.88-m long rope has a mass of 0.139 kg. The tension is 55.4 N. An oscillator at one end sends a harmonic wave with an amplitude of 1.09 cm down the rope. The other end of the rope is terminated so all of the energy of the wave is absorbed and none is reflected. What is the ...

**math**

for two consecutive numbers, the sum of the smaller number plus twice the lage number is 38. what are the numbers?

**statistics**

MacDonald’s executives want to experiment with redesigning its restaurants so that the customers form one line leading to four registers, rather than four lines leading to four separate registers. They redesign 30 randomly selected restaurants with the single line. In add...

**Chem**

A 2.00L flask is filled with propane gas(C3H8)at 1.00atm and 15C. What is the mass of propane in the flask?

**MATH**

Which division sentence will give an answer that is not in equal groups? a.) 26/4 b.) 35/7 c.) 42/6 d.) 45/5

**language**

what sentence could you use please in an appaositive sentence

**MATH**

Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability distributio...

**Statistics**

Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability distributio...

**Stat**

Coin box Question: Assume that there are 25 pennies, 10 nickels, 10 dimes, and 5 quarters in a box. after shuffeling the box, you pick a coin at random and note down its face value. let x represent the face value of the coin in cents. then construct the probability distributio...

**physics**

The distance from an observer on the plain to the top of a nearby mountain is 5.3km, and the angle between this line and the horizontal is 8.4 degrees. How tall is the mountain?

**Algebra**

You're right, it is 2x^2.

**Algebra**

69: 16x^2+8x-3. I inserted this into the quadratic formula and got -8+/- the square root of (8^2-4(16)(-3)/(2 times 16). This reduced to -8+/- the square root of (64+120)/32, which further reduced to -8+/-the square root of 184/32. I reduced the top part to -8 +/- the square r...

**math**

identifying domain and range

**Physics**

A fire helicopter carries a 679 kg bucket of water at the end of a 15.2 m long cable. Flying back from a fire at a constant speed of 42.5 m/s, the cable makes an angle of 49.0o with respect to the vertical. Determine the force of air resistance on the bucket.

**Physics**

Your groceries are in a bag with paper handles. The handles will tear off if a force greater than 50.8 N is applied to them. What is the greatest mass of groceries that can be lifted safely with this bag, given that the bag is raised with constant speed.

**Chem**

You've just prepared a solution by transferring 20.0 g of glucose into a 1.0 - L volumetric flask, and adding water to the mark. Calculate the concentration of the glucose solution in terms of millimoles/Liter, mg/mL, and % (m/v). Ok, I think i'm overwhelmed by the wor...

**Chem**

You've just prepared a solution by transferring 20.0 g of glucose into a 1.0 - L volumetric flask, and adding water to the mark. Calculate the concentration of the glucose solution in terms of millimoles/Liter, mg/mL, and % (m/v).

**math**

I need help with finding function that appears in newspaper, and what is the domain and range of each. My question is what i'm i suppose to look for in the newspaper a article?