# Posts by sam

Total # Posts: 5,203

**math**

al has ribbon and I need some he has 5 and I have 2. how many do both of use have to make it even?

**calculus **

Evaluate the double integral ?? y dA over D, where D is the top half of the disk with center the origin and radius 5?

**math**

For a normal distribution with mean of 80 and a standard deviation of 8, find the number of standard deviations the raw score 67 is from the mean (Give answer as a positive value rounded to nearest hundredth). (67 - 80) / 8 = 13/8 is this the right answer

**RE:Scott**

(67 - 80) / 8 = 13/8

**math**

For a normal distribution with mean of 80 and a standard deviation of 8, find the number of standard deviations the raw score 67 is from the mean (Give answer as a positive value rounded to nearest hundredth).

**math**

A player drawn a face card and a 3 and a 4 from a standard deck of cards (without an ace). According to the rules of blackjack a face card counts as a 10. What is the probability that the next card she draws will bring her total to 21 ? what is the probability that the next ...

**trigonometry**

Angle A is in standard position and terminates in quadrant IV. If sec(A)?=?4 3 , complete the steps to find cot(A).

**engineering**

An aircraft flies at an altitude of 30,000 feet. Determine the air temperature (in [K]), air pressure (in [Pa]) and air density (in [kg/m3]) at this altitude, according to the standard atmosphere.

**Math**

use the triangle and the give information to solve the triangle. a=, c=, find b, a, and B

**7TH GRADE MATH HELP!!!!!**

Hey I had to divide 7 by 20 and the answer is .35 but I need to solve it without a calculator and I dont know what I'm doing please help thanks you

**Language Art**

Read this sentence from the third paragraph: First, it has large fins at the top of its head that look like ears. What is the main purpose of this sentence in the paragraph? A: To introduce a list of features B: To introduce a new topic C: To make connections to earlier points...

**Math**

A bus travels 180 miles in same time a car travels 240 miles. if cars speed is 15mph faster than speed of bus, find the speed of car and bus.

**math**

32.17Grams rounded to the nearest gram

**math**

($75*0.6)

**algebra 1**

The area of a rectangle is represented by x2 – 5c – 14. What are the dimensions? could someone show me how to set this up to figure?

**physics **

A source delivers an AC voltage of the form ?v = (89.0 V) sin (70?t), where ?v is in volts and t is in seconds, to a capacitor. The maximum current in the circuit is 0.460 A. Find the following. (a) Find the rms voltage of the source. (b) Find the frequency of the source. (c) ...

**calculus **

Notice that the curve given by the parametric equations x=25?t^2 y=t^3?16t is symmetric about the x-axis. (If t gives us the point (x,y),then ?t will give (x,?y)). At which x value is the tangent to this curve horizontal? x = ? At which t value is the tangent to this curve ...

**calculus **

Find the length of the curve de?ned by the parametric equations x = 2/3t, y = 2ln((t/3)^2?1) from t =6 to t =7.

**calculus **

If x = 18cos^3? and y = 18sin^3?, ?nd the total length of the curve swept out by the point (x,y) as ? ranges from 0 to 2?.

**calculus **

Consider the curve de?ned by the equation y = 4x^3 +3x. Set up an integral that represents the length of curve from the point (0,0) to the point (4,268).

**algebra equation**

can someone help me set up these two equations please. The sum of the distance, d, divided by 4 and 6 amounts to 2 subtracted from the distance, d. The sum of the distance, d, divided by 20 and 9 amounts to 18 subtracted from twice the distance, d

**algebra**

thanks i appreciate it

**algebra**

d/20+9=2d-18 ?

**algebra**

can someone help me set up these two equations please. The sum of the distance, d, divided by 4 and 6 amounts to 2 subtracted from the distance, d. The sum of the distance, d, divided by 20 and 9 amounts to 18 subtracted from twice the distance, d

**Math**

Mallory needs 4 3/4 cups of flour for a bread recipe. She has 2 2/3 cups, how many more cups does she need?

**physics **

A metal rod of mass m slides without friction along two parallel horizontal rails separated by a distance L and connected by a resistor R. A uniform magnetic field of magnitude B is applied perpendicular to the plane of the paper. A force is applied to give the bar an initial ...

**physics **

A coil has an inductance of 9.00 mH, and the current in it changes from 0.200 A to 1.50 A in a time interval of 0.300 s. Find the magnitude of the average induced emf in the coil during this time interval.

**MAth**

PQRS IS A RECTANGLE AB=25CM, BC=15CM .IN WHAT RATIO DOES BISECTOR OF ANGLE C DIVIDES AB?

**MAth**

IN RECTANGLE ABCD ,AB=25CM, BC=15CM. IN WHAT RATIO DOES BISECTOR OF ANGLE C DIVIDES AB?

**alg II **

what is the angle whose cotan is 1? what is the angle whose cot is sqrt 3? 45 degree 30 degree are these correct

**alg 2 cotangent **

Hi - any problem you can give me to make sure I understand ex: square root 3, 1, square root 3 (over) 3, 0

**ALG II COT**

evaluate the cotagent - like giving degrees and finding the answer.

**ALG II COT **

Have a tommorrow and want to make sure I understand the COT (cotangent) formula could someone give me a problem to do and check it. Thanks Sam

**calculus **

In this problem, you will investigate the error in the nth degree Taylor approximation to ln(x+1) about 0 for various values of n. (a)Let E_1=ln(x+1)?P_1(x)=ln(x+1)?(x). Using a calculator or computer, graph E1 for ?0.1?x?0.1, and notice what shape the graph is. Then use the ...

**Math**

A new automobile costs $32,000. The value of the same automobile after t years is given by V = 32000(0.8)t. The following steps determine how many years it will take for the value to decrease to one-eighth the initial value, which is $4,000. 1)weneedtocompute(0.8)t=1/8 ,...

**Trignometry**

In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t-800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10 hours of day light? the...

**math**

integral of ((1+sin(2x))^0.5)/(sin(x)^2) I tried all kind of substitution, simplification but unable to solve it.Need a hint only no solution please.

**physics **

A long, cylindrical conductor of radius R carries a current I as shown in the figure below. The current density J, however, is not uniform over the cross-section of the conductor but is a function of the radius according to J = 6br^4, where b is a constant. Find an expression ...

**Probability**

Let Z be a nonnegative random variable that satisfies E[Z^4]=4. Apply the Markov inequality to the random variable Z^4 to find the tightest possible (given the available information) upper bound on P(Z?2). P(Z>=2)<= ?E[Z^4]/2 = 2 But this is not the right answer

**calculus **

Approximate the value of the series to within an error of at most 10^?5. The infinite series from n=1 to infinity (?1)^(n+1)/(n^6) according to the equation (2): |S_n - S| is less than or equal to a_(n+1) what is the smallest value of N that approximates S to within an error ...

**Math**

Johnsons mother bought 25kg of flour.she put the flour equally in 8 small bags.she kept 3 bags and gave the rest to friends.wat is mass of flour she kept?wrote your answer as a mixed number in aimplest form

**Business **

1) Why is it an excellent idea for anyone, to ALWAYS pay their credit card bill off, at the end of each month 2) Describe what kind of interest (simple or compound) should you look for in an investment, state why. 3) Lan-Sun just received a notice indicating that his credit ...

**Calculus**

Find the derivative f'(x)= : f(x)=?[2,x] ((1/2)t^2-1)^8 dt

**Geometry**

For each kilogram of a? person's weight, 2.5 milligrams of a drug is to be given. What dosage should be given to a child who weighs 102102 ?pounds? Use the fact that 1 l b equals 0.45 kg.

**math**

p = 14 ? 2q; p = 3

**Word problem**

What about this one guys, I tried setting it up like i was shown on the one similar but i keep getting a negative number. Kelsey has 32 coins in her pocket, all which are nickels and quarters, If the total value of her change is $4.20, how many nickels and how many quarters ...

**History**

You are right,the answer is b. Thank you

**History**

You are right,the answer is b. Thank you

**Word problem**

I get it. Thanks guys!

**Word problem**

Sophia has 22 coins in her pocket, all of which are nickels and dimes. If the total value of her change is $1.75, how many nickels and how many dimes does she have? Im lost on how to set up the equations, please help and show me how?

**Math**

Cassie rolled two 1-6 cubes 108 times. How many times should she predict the sum of 5?

**Chemistry**

Will a photon of light of wavelength 480 nm excite an electron in the hydrogen atom from the n = 1 level to the n = 2 level? How would I figure this out?

**please help**

yes it does thanks so much

**please help**

i need help setting up 2 equations. The sum of the radius,r, times 2 and 3 equals 4 less than the radius,r. The sum of the radius, r, times 13 and 15 equals 16 less than twice the radius,r.

**Math**

Stacy earns $12.50 an hour at her job. She wants to earn at least $390. Write an inequality hat represents all of the possible numbers of hours (h) that she could work to make at least $390.

**Math**

if he gives the quarters only to his children, Miss jackson will not have any quarters because he did not give her any

**Calculus**

A manufacturer needs to produce a cylindrical can with a volume (capacity) of 1000cm cubed. The top and the bottom of the container are made of material that costs $0.05 per square cm, while the side of the container is made of material costing $0.03 per square centimeter. ...

**Math**

17 hundreds= 1,700 2 tens= 20 6 tenths= .6 7 thousandths= .007 Add them together and you get 1,720.607 MY OTHER ANSWER WAS WRONG!!!!!

**Math**

17 hundreds= 17,000 2 tens= 20 6 tenths= .6 7 thousandths= .007 Add them together and you get 17,020.607

**physical sciences**

during the takeoff roll, a boeing 747 jumbo jet is accelarating at 4m\s. it requires 40 s to reach takeoff speed. what is the initial velocity of the jet?

**financial securities**

Cat Bonds An insurance company has sold insurance to cover damage that arises from hurricanes in the South Texas area. If a hurricane occurs, the insurance company is faced with losses as it pays out claims. The magnitude of the losses will depend on many factors: the severity...

**Trigonometry**

Triangle ABC is given where the measure of angle a is 33°, a=15 in., and the height, h, is 9 in. How many triangles can be made with the given measurements? Explain your answer.

**Science**

For an organism that has a diploid number of chromosomes of 12, give the number of chromosome/chromatid copies at the end of the following cell-cycle phases: a) G2 phase b) Meiosis I metaphase c) Meiosis II telophase

**math**

Find two binomials whose sum is 4x^2 - 4x - 15

**physics **

A typical magnitude of the external magnetic field in a cardiac catheter ablation procedure using remote magnetic navigation is B = 0.080 T. Suppose that the permanent magnet in the catheter used in the procedure is inside the left atrium of the heart and subject to this ...

**Pre-cac**

Find a such that f(x)= ax^2-3x+5 has a maximum value of 15. I'm stuck because how am I suppose to complete the square? 3/2= 1.5? then square 1.5? So lost.

**Help please I am lost, algebra**

thank you

**Help please I am lost, algebra**

I have notes on this from online but they are different from this problem and I don't know how to solve it. Find the equation of a line with the given information: slope -5/4 and g(14)=-6 It is asking for, point slope form, slope intercept form, Function form, if vertical ...

**Chem: please help**

Calculate the concentration of a solution prepared by adding 15.00 mL of 2.10 X 10^-3 M KMnO4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

**chemistry **

consider equilibrium equation below `Mg(NO3)2(aq) + 2Na(OH)(aq) <--> Mg(OH)2(s) + 2NaNO3 (aq) If NH3 is added, according to Le Chatelier's Principle, which way would reaction shift?

**calculus **

In electrical engineering, a continuous function like f(t)=sin(t), where t is in seconds, is referred to as an analog signal. To digitize the signal, we sample f(t) every ?t seconds to form the sequence Sn= f(n?t). For example, sampling f every 1/10 second produces the ...

**physics**

Two Children,A and B, fire identical 10g ball bearing from a catapult. The elastic band of each catapult is elastically extended by 0.10m and then released to fire a the ball bearings. Child A's elastic band has a spring constant of 144 N/m. Calculate the energy ...

**Chemistry**

A tablet containing calcium carbonate and fillers with a mass of 1.631 g was dissolved in HCl. After the fillers were filtered out, the HCl was neutralized by adding sodium carbonate. The resulting precipitate was pure calcium carbonate (with the fillers removed). The solid ...

**Math**

F(x) = -x^2 - x +2 graph function identify the vertex and axis of symmerty. Can some one explain the steps to get answer? I know I need to find the points on a graph just so confused

**calculus **

You are visiting your friend Fabio’s house. You ?nd that, as a joke, he ?lled his swimming pool with Kool-Aid, which dissolved perfectly into the water. However, now that you want to swim, you must remove all of the Kool-Aid contaminated water. The swimming pool is round...

**Math**

1/4

**calculus **

A group of engineers is building a parabolic satellite dish whose shape will be formed by rotating the curve y=ax^2 about the y-axis. If the dish is to have a 6-foot diameter and a maximum depth of 2 feet, ?nd the value of a and the surface area (in square feet) of the dish.

**Probability**

A lightbulb is installed. With probability 1/3, it burns out immediately when it is first installed. With probability 2/3, it burns out after an amount of time that is uniformly distributed on [0,3]. The expected value of the time until the lightbulb burns out is

**Probability**

Suppose that X has a PDF of the form f(x) {1/x^2 if x>= 1 { 0 otherwise For any x>2, the conditional PDF of X, given the event X>2 is (Your answer should be an algebraic function of x)

**calculus **

To ?nd the length of the curve de?ned by y = 5x^3+9x from the point (-3,-162) to the point (1,14), you’d have to compute the integral [a,b] f(x)dx where a = b = f(x) =

**calculus **

Find the volume of the solid obtained by rotating the region bounded by the given curves about the speci?ed axis. x+y = 3, x = 4?(y?1)^2; about the y-axis.

**calculus **

Find the volume of the solid obtained by rotating the region bounded by the given curves about the speci?ed line. x = 1?y^4, x = 0; about x = 1.

**Personal Finance**

Freddie Sue has a monthly gross income of $2950 and total monthly debt payments of $160. She will have to make a down payment of 15% of the purchase price of a new home and estimates that the monthly property tax and insurance cost will be $210. If she can get a 30 year loan ...

**calculus **

The base of a certain solid is the triangle with vertices at (?6,3), (3,3), and the origin. Cross-sections perpendicular to the y-axis are squares. Then the volume of the solid?

**calculus **

Find the area of the region between the curves y = x^2 and y = 2/(x^2+1).

**calculus **

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then ?nd the area of the region. y = 5x^2 and y = x^2+6

**calculus **

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y = 4?x and y = 5 and 2y+2x = 6.

**Social Studies Help ASAP Please!**

So would it be A? (I'm between A and D now.)

**Social Studies Help ASAP Please!**

Resistance to Immigration Nativists believed that some immigrants did not fit into American culture because their customs were to different ---> Prejudice and violence grew as the number of Chinese immigrants increased ---> ? Based on your reading, which statement best ...

**physics**

A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the ...

**Math**

x=number of animals with 4 legs y=number of animals with 2 legs 36= total number of legs 10= total number of animals x+y=10 x=10-y 4x+2y=36 4(10-y)+2y=36 40-4y+2y=36 -2y=-4 y=2 x=8

**Math**

Correction: Should be 8 animals with 4 legs and 2 animals with 2 legs.

**Math**

10 with 2 legs and 4 with 4 legs

**Math, data management**

Let's say N=10 a=4 2s b=3 3s c=3 7s Therefore, 10!/(4!×3!×3!)=4200 I hope it helps

**math**

The Toro Ski club is planning a ski trip for the upcoming long weekend. They have 40 skiers signed up to go, and the ski resort is charging $120 per person. The resort manager offers to lower the rate per person by $2 for each additional skier up to a maximum number m. (So if ...

**math**

If a hen and a half can lay an egg and a half in a day and a half, then how much time is needed for three hens to lay three eggs?

**physiology**

how many grams of glucose (180grams/mole) to make a 13% glucose solution with a final volume of 600 milliters.

**History World**

Could this be in Russia defaults on its debt? Before the revolution, czarist Russia regularly sold bonds abroad to finance the country's economic development. The loans helped finance 40,000 miles of railroad, including the Trans-Siberian, as well as ports, factories and ...

**History World**

France developed a political alliance with Russia Austria- Hungary demanded equal support from France Germany canceled its alliance with France.

**History World**

Which of the following results from France giving Russia a loan to Build the Trans-Siberian railway? I think it's Russia defaults on its debt making an enemy of France.Don't I can't find anything. Help please