# Tom

Newest questions and responses by Tom-
## calculus

How do I find the sum of a geometric series from 2 to infinity of -3/ (4^n) ?

*asked on March 11, 2019* -
## calculus

sum of the geometric series (2 - 3^n) / 5^n whats a and r?

*asked on March 11, 2019* -
## calculus

Find the volume of the solid obtained by rotating the region in the first quadrant enclosed by the curves y= tanx and y=2cosx between the bounds 0 and pi/2 around y=-1 would it be A= pi * ∫ 0 to 0.78 {(2cosx+1)^2 - (tanx+1)^2}

*asked on March 5, 2019* -
## calculus

Find the volume of the solid obtained by rotating the region in the first quadrant enclosed by the curves y= tanx and y=2cosx between the bounds 0 and pi/2. I need the setup.

*asked on March 4, 2019* -
## physics

a 0.30kg ball encounters a catchers hand while moving at the rate of 40m/s. the catcher draws his hand back so that the ball comes to a stop in a distance of 50cm. how strong a force did the ball exert on the catchers hand? i got 29.43N

*asked on February 19, 2019* -
## Algebra

A butcher has supplies of lean beef containing 15% fat, and fat trim containing 100% fat. How many kg of lean beef and fat trim are needed to make 50 kg of hamburger containing 25% fat? (round your answers to 1 decimal place.)

*asked on February 14, 2019* -
## Algebra

Carmen invests a total of $5200. Some of the money is invested at 8%. The rest is invested at 10%. If Carmen earned $496 of interest in one year, how much did she invest at each rate?

*asked on February 14, 2019* -
## calculus

evaluate the improper interval with an interior discontinuity dx/x^3 from -1 to 2

*asked on January 25, 2019* -
## calc

integrate (x-2) / (x+1)^2 +4 dx

*asked on November 30, 2018* -
## Physics

A horse trots at 10m/s for 5 s and then turns around and walks back in the other direction at 2.5m/s for 30 s. a) what distance did the horse travel? b) what is its displacement? c) what is its average speed? d) what is its average velocity?

*asked on November 14, 2018* -
## Physics

if an elevator starts from rest and rises with an acceleration of +0.29m/s^2. If each floor is 3m high, a) how long does it take to pass the 12th floor? b) how fast is the elevator going when it passes the 5th floor?

*asked on November 8, 2018* -
## science

who discovered the optimal angle to launch projectile

*asked on November 4, 2018* -
## ap calculus bc

the jewelry box will have rectangular sides and an open top. the longer sides will be made of gold at a cost of $300/in^2 and the shorter sides will be made from platinum at a price of $550/in^2. the bottom of the box will be made from plywood at a cost of

*asked on October 27, 2018* -
## chemistry

Calculate the volume required for complete neutralization of 60.00mL of 0.1500 M KOH(aq). a) 0.1500M nitric acid, HNO3. The answer I got for this question is 0.06 using method c1v1=c2v2 but I want to show using unit analysis. Please help me know how to do

*asked on October 20, 2018* -
## physics

In the diagram below, a water wave having a speed of 0.25 meter per second causes a cork to move up and down 4.0 times in 8.0 seconds. What is the wavelength of the wave is it 2m?

*asked on October 3, 2018* -
## physics

another ball is thrown vertically upwards and returns to the ground 5 seconds later. the height to which the ball rises is approx

*asked on October 3, 2018* -
## calculus

f(x)= 1/4 * (sin2x)^2 find dy/dx d/dx (1/4 * (sin2x)^2)= (sin2xcos2x)/ 2 ?

*asked on September 22, 2018* -
## art

Modernism focused on the distinction between “high” and “low” culture in fine art. Which of the following reacted against this distinction by incorporating images from “lowbrow” culture into works of fine art? a)Minimalism b)Pop Art c)Site

*asked on September 21, 2018* -
## Science

You need to make a 150mM solution of NaCl (MW = 58). How much NaCl do you need to make 1L (in moles and in grams)? If you b need to make 250mL how much NaCl would you need in grams?

*asked on September 19, 2018* -
## calc

d/dx (cot(x) / sin(x)) = I got dy/dx= -csc(x) - cos(x)cot(x)

*asked on September 18, 2018* -
## Physics

solve for h in the equation for density P= M/V and V= pi r squared h

*asked on August 28, 2018* -
## algebra

A car was stopped at a red light. When the light turns green, the car reaches a speed of 41 miles per hour in 1 seconds. What is the acceleration, to 1 decimal place?

*asked on August 6, 2018* -
## Chemistry

What is the concentration of an unknown sulfuric acid solution if 0.2M Sodium hydroxide is titration to neutralize the acid? The initial volume of the Sodium hydroxide is .50ml and the final volume is 30.75 ml. There is 35mL of acid.

*asked on July 13, 2018* -
## Chemistry

What is the concentration of a solution of sodium hydroxide if I mix 15.0g of sodium hydroxide with enough water to make 500.0ml of solution?

*asked on July 13, 2018* -
## Chemistry

Can you show me how to calculate this equation? What is the concentration of phosphoric acid solution of 30.0ml of a 0.2M of Potassium hydroxide is used to neutralize. The volume of acid is 20.0ml.

*asked on July 13, 2018* -
## Chemistry

1. how many grams of KOH will neutralize (react with) 0.15 mol HNO3 2. how many liters of 1 M HCl will neutralize 10 ML of 9.2 M NaOH

*asked on June 4, 2018* -
## Algebra

In a 120 volt electrical circuit having a resistance of 16 ohms, the available power P in watts is a function of I, the amount of current flowing in amperes. If P(I)=120I-16I^2, how many amperes will produce the maximum power in the circuit? What is the

*asked on June 1, 2018* -
## Algebra

Suppose that an object is dropped from the top of the leaning tower of pisa, 185 feet above the ground. The objects height in feet, h, after t seconds is given by the following fucntion: h(t)= -16t^2+185. How long will it take for the object to hit the

*asked on May 31, 2018* -
## Algebra

As part of their half time show, the members of the band must walk diagonally from one corner of the football field to opposite corner. If the field is 100 yards long and 35 yards wide, how far must the band member's march?

*asked on May 31, 2018* -
## Algebra

The area of a rectangular carpet is a^2+8a+3a+24 square units. What is the length and width of this carpet as an expression?

*asked on May 31, 2018* -
## Algebra

A ball is thrown in an upward direction off a platform that is 45 feet high with an initial velocity of 60 feet per second. The height, in feet, of the ball at the time t is given by h(t)= -16t^2 + 60t + 45. The time, t, is given in seconds. Round all

*asked on May 29, 2018* -
## Algebra

The ratio of the length to the width of a golden rectangle is (1 + √(5):2:.The dimensions of a garden form a golden rectangle. The width of the garden is 12 feet. Find the length L of the garden. Round your answer to the nearest foot.

*asked on May 24, 2018* -
## Math

The length of a rectangular garden is 4 yards more than its width. The area of the garden is 60 square yards. Find the dimensions of the garden.

*asked on May 23, 2018* -
## algebra

The width of a rectangle is 11 inches less than its length. Find the dimensions of the rectangle if the area is 80 square inches.

*asked on May 23, 2018* -
## Trigonometry

Write 4 other points for (-3,11π/3) on -2π ≤ θ < 2π

*asked on May 21, 2018* -
## Trigonometry

1. Convert r= 2/1+sinθ to cartesian 2. Convert y=3 to polar 3. Convert 3x^2+3y^2-6x=0 to polar

*asked on May 20, 2018* -
## math

find [dy/dx] x^2 Using this : limit as the change of x —-> 0 for f(x + deltax) - f(x) —————————- deltax run through each step

*asked on May 17, 2018* -
## History

who are the most influential people of the 1920's or 1930's Canadians

*asked on May 6, 2018* -
## History

I am doing a History project and i need to know ranked 1 to 8, 8 most influential people of the 20's and 30's

*asked on May 6, 2018* -
## History

what made the 1920's roaring

*asked on May 6, 2018* -
## History

what were the four leading causes to the great depression

*asked on May 6, 2018* -
## Physics

When the Philae probe landed on Comet 67P, it took approximately 28 minutes for a radio signal to be received at the European Space Operations Centre. Determine the distance (in metres) from the Philae probe to Earth.

*asked on April 30, 2018* -
## Trigonometry

Write in standard form: -2y^2+x-4y+1=0

*asked on April 25, 2018* -
## Physics

The note D above middle C has a frequency of 294 cycles per second, and the note E has a frequency of 330 cycles per second. A driver of a moving car sounds the horn, which emits an E tone, but a stationary observer hears a D tone. Calculate the speed at

*asked on April 25, 2018* -
## Maths

Consider the cubic polynomial f(z) =z3−2z+ 4. Given that z = 1 +i is a root of f(z), determine all the roots of f(z) in C

*asked on April 24, 2018* -
## Engineering

A heated spherical ceramic object (diameter= 10cm), initially at 1200k, is held in a large enclosure whose walls are maintained at a temperature of 300k. The sphere has an emissivity of 0.7. Properties of Sphere: Density =4500 kg/m^3, heat capacity= 400

*asked on April 10, 2018* -
## Geometry

In a triangle, prove the perpendicular from the vertex opposite the side that is not less than either of the remaining sides falls within the triangle.

*asked on April 9, 2018* -
## Geometry

For a point, give a construction of a line so the portion intercepted by the segments of a given angle are bisected at the point.

*asked on April 9, 2018* -
## SAT

the collection of antique puppets, A(all older than) two hundred years, had been B(painstakingly) made for youngsters C(long since) gone. D(no change) find the mistake

*asked on April 6, 2018* -
## math

the gross domestic product (GDP) of a certain country is growing at a constant rate. In 2009 the GDP was 125 billion dollars , and in 2011 it was 155 billion dollars. At what percentage rate will the GDP grow in 2014?

*asked on March 31, 2018* -
## AP Calculus Help Five Questions

1. Find the particular solution to y " = 2sin(x) given the general solution y = -2sin(x) + Ax + B and the initial conditions y(pi/2) = 0 and y'(pi/2) = -2. 2. What function is a solution to the differential equation y ' - y = 0? 3. If dy/dx = cos^2(pi*y/4)

*asked on March 27, 2018* -
## AP Calculus

Find the particular solution to y ' = 2sin(x) given the general solution is y = C - 2cos(x) and the initial condition y(pi/2) = 1

*asked on March 26, 2018* -
## AP Calculus

Find the area of the region bounded by the curves y = sin^-1(x/2), y = 0, and x = 2 obtained by integrating with respect to y. Please include the definite integral and the antiderivative.

*asked on March 26, 2018* -
## calc

cotx = - rad3 / 3 does x= 2pi/3 and 5pi/3?

*asked on March 18, 2018* -
## math

(4x^4 - 4x^2 + 6x) / (x-4) show how youd divide this using synthetic divison

*asked on March 14, 2018* -
## history

in the most basic terms, what is a tariff and what is it's purpose?

*asked on February 12, 2018* -
## math

f(x)= 3x^2 +12x + 2 when you complete the square, is it y= 3(x+2)^2 - 10

*asked on February 12, 2018* -
## chemistry

2NO2(g) N2O4(g) If 0.625mol of dinitrogen tetraoxide in 5.0L is allowed to come to equilibrium and at equilibrium has a concentration of 0.0750M, Calculate K for this reaction. Does K= 7.5?

*asked on February 10, 2018* -
## math

-x^2 + 4x = 2 do you have to factor out a -1 before you complete the square? and whats the answer in vertex form?

*asked on February 9, 2018* -
## physics

Two slits are 0.158 mm apart. A mixture of red light ( wavelength = 65 nm) and yellow green light (wavelength = 565 nm)falls on the slits. A flat observation screen is located 2.24 m away. What's the distance on the screen between the third order red

*asked on January 7, 2018* -
## physics

Two point sources produce waves in phase with the same amplitude and wavelength. The sources are a distance d apart. The distance from the right bisector to a point on the second nodal line is x2. The distance between the sources is cut in half. What is

*asked on January 7, 2018* -
## physics

Two small loudspeakers emit sound waves of the same amplitude and frequency in phase with each other. The waves produce an interference pattern such that the distance from the right bisector to a point P on the third nodal line is x3. The wavelength of the

*asked on January 7, 2018* -
## math

2sec^2x - 3tanx - 5 = 0 over the interval 0 to 2pi x= 1.14, 4.28, 5.68, and 2.54 right?

*asked on January 2, 2018* -
## mathh

2sec^2x -3tanx =5 for [0,2pi) Please solve for the values of x for me.

*asked on December 27, 2017* -
## math

2sec^2x -3tanx =5 for [0,2pi)

*asked on December 27, 2017* -
## Math

A ferris wheel has a radius of 20m and the bottom is 2m above the ground. The wheel makes one rev in 40 sec. If the rider gets on at 30^0 on the left of the lowest point going downwards, wirte the sine function to show this movement

*asked on December 21, 2017* -
## Math

Some one gets on to a ferris wheel 30^0 left of the bottom. What would be the phase shift if I am writing a sine Function? Is it -120^0 or + 120^0. Please explain.

*asked on December 21, 2017* -
## calc

lnx = x^3 + 1 i know x=1 but can you solve this algebraically?

*asked on December 18, 2017* -
## Physics

A 72 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 12 m , and falls a total of 35 m . Calculate the maximum acceleration she experiences.

*asked on December 11, 2017* -
## Caluclus

Find the point on the line 7x+1y−5=0 which is closest to the point (−2,−6).

*asked on December 8, 2017* -
## precalculus

how to find the max and min of a sine function? For the maximum, do you do midline+ amplitude? For the midline- Amplitude? f(x)= 7cosx + 15 Max is 15+7=22 min is 15-7= 8

*asked on December 5, 2017* -
## information systems

Assignment: You are required to briefly but properly document the functional requirements for an INVENTORY INFORMATION SYSTEM by creating the following using the correct symbols: 1. The description of the selected information system in the selected

*asked on December 2, 2017* -
## precalc

y= -2cos(pi/6) + 8 whats the maximum and minimum?

*asked on November 19, 2017* -
## precalc

y= -2cos(pi/6) + 8 whats the maximum and minimum?

*asked on November 19, 2017* -
## college chemistry

if co2 were soluble in h2o, how would that affect the calculated value for molecular mass of the co2?

*asked on November 18, 2017* -
## CHEMISTRY

The heat evolved in the reaction of hydrobromic acid with potassium hydroxide was determined using a coffee coup calorimeter. The equation for the reaction is: HBr(aq) + KOH(aq) -------------> KBr(aq) + H2O(l) When 25.0 mL of 1.00 M HBr at a temperature of

*asked on November 16, 2017* -
## Chemistry

How many liters of oxygen are required to react completely with 2.4 liters of hydrogen to form water? H2 + O2--> H2O?

*asked on November 16, 2017* -
## math

85=5e^0.025x solve for x

*asked on November 8, 2017* -
## Math

Simplify the algebraic expression: 7-2[3(2x-5)-(5x+3)

*asked on November 7, 2017* -
## Math

Solve for X: 15-(3x-8) = 4x-5(3x-7)-25

*asked on November 7, 2017* -
## Math - Algebra

Solve for X 15-(3x-8) = 4x-5(3x-7)-25

*asked on November 7, 2017* -
## Math - Algebraic expressions

Simplify the Algebraic Expression 7-2[3(2x-5) - (5x+3)]

*asked on November 7, 2017* -
## Math - Algebraic equations

A stamp collector bought 295 stamps for $87.75. The purchase included 5 cent, 25 cent, and 40 cent stamps. How many of each type stamp was purchased?

*asked on November 6, 2017* -
## Math Algebra

A stamp collector bought 295 stamps for $87.75. The purchase included 5 cent, 25 cent, and 40 cent stamps. How many of each type stamp was purchased?

*asked on November 6, 2017* -
## Physics

In an experiment conducted using the Young's double-slit apparatus, the separation between the slits is 20 µm. A first-order constructive interference fringe appears at an angle of 2.5o from the zeroth order (central) fringe. A. What wavelength of light

*asked on October 25, 2017* -
## Statistics

There are two decks of cards. Each deck has a red, a yellow, a blue, and a green card in it. If a card is drawn, from the first deck, and then a second card drawn from the second deck, what is the probability that a red card and green card are drawn (not

*asked on October 18, 2017* -
## calculus

3cotx - radical 3 = 0 solve for x please show it step by step

*asked on October 3, 2017* -
## Math please help!!!

Solve the system of equations to find x,y,z (hint let d=x2 e=y2 and d=z2 . Find d e and f first) 2 means squared I don't have it on my keyboard. X2+y2+z2=9 3x2-y2-z2=7 Y2+2z2 =6

*asked on October 1, 2017* -
## Pre-calc

Perform the operation and write the result in standard form. ___16___ 2x+2

*asked on September 28, 2017* -
## Pre-calc

Find a polynomial function with -2 and 3-i.

*asked on September 28, 2017* -
## Economics

The pricing of pharmaceutical products can be controversial. A recent example is EpiPen produced by Mylan which is used to treat anaphylaxis. The retail price of an EpiPen is $300, while industry sources estimate that it costs around $30 to produce each

*asked on September 26, 2017* -
## calc

given that log2 3 = x, log 2 5=y and log 2 7 = z, express log 2 21 in terms of x,y, and z the 2 is the base

*asked on September 18, 2017* -
## calc

tan3x= radical3 / 3

*asked on September 18, 2017* -
## calc

sin2x = (radical 3)/ 2 solve each equation on the interval [0,2pi)

*asked on September 18, 2017* -
## Computational Thinking

The Happy Cow Ice Cream Company manufactures several types of ice cream. Design a flowchart or pseudocode for a program that accepts an ice cream flavor (for example, “triple chocolate”), price per gallon, and number of gallons sold in the average

*asked on September 18, 2017* -
## Computational Thinking

Anybody Help on this:The Daily Gazette accepts classified ads in several categories. For most ads, the newspaper charges 10 cents per word for the first 50 words, and 8 cents per word for every word after that. Design a flowchart or pseudocode for a

*asked on September 18, 2017* -
## calc

csc -5pi/6 = is it -2?

*asked on September 17, 2017* -
## computer code

Design a pseudocode for a program that accepts an ice cream flavor the price per gallon and number of gallons sold a year, display a message this flavor is the best seller having more than 40000 gallons a year sold

*asked on September 15, 2017* -
## CHEM

If 100g of NaOH are reacted with 85.00g H3PO4, how many grams of Na3PO4 can be made? Make sure the final answer is in the correct number of sig figs. 3NaOH + 1H3PO4 ---> 1Na3PO4 + 3H2O I got 100g Na3PO4

*asked on September 13, 2017* -
## precalc

(-2)^x = - 1/128 solve for x

*asked on September 12, 2017*