# carl

Popular questions and responses by carl-
## Maths

The sides of the equilateral triangle is 3x+2,2y-x and y+3 find x and y.and the perimeter of the triangle

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

for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly selected college students are listed below. use a 0.10 significance level to test the claim that the standard deviation of IQ scores

*asked on May 14, 2012* -
## math

A car left from Uphere at 9:00 am and arrived at Downthere, 340 km away at 1:15 pm the same day. Find the average speed of the car in kilometers per hour.

*asked on July 21, 2020* -
## math

The median of a set of 8 consecutive even integers is 61. What is the largest integer in the set?

*asked on December 4, 2017* -
## Trig

Which trigonometric function can equal or be greater than 1.000? A Sine B Cosine C Tangent D none of the above

*asked on December 13, 2011* -
## Physics

Two objects are moving in the xy-plane. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. What is the total momentum of the system? (should I

*asked on November 9, 2014* -
## Physics electric potential energy difference

A current loop with radius 20 cm and current 2 A is in a uniform magnetic field of 0.5 T. Considering all possible orientations of the loop relative to the field, what is the largest potential energy difference (in Joules) you can find between two

*asked on November 22, 2013* -
## physics

water leaves a hose at a rate of 1.5kg/s with a speed of 20m/s and is aimed at the side of a car, which stops it (splashing back is ignored). what is the force exerted by the water on the car?

*asked on August 28, 2012* -
## Physics

Two objects are moving in the xy-plane. No external forces are acting on the objects. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. Some

*asked on November 9, 2014* -
## English II B

Need Help Please. A student is thinking about different forums for publishing an editorial. Which of the following would be appropriate? 1.a dramatic reading 2.an anthology 3.a poetry contest 4.a school newspaper

*asked on April 3, 2014* -
## math

in triangle ABC, AB=6, BC=12 AND AC=X. Which of the following cannot be a value of x? a. 6 b.7 c.8 d.9 e.10

*asked on September 21, 2013* -
## Dynamics

A stone has an initial velocity of 100 fps up to the right at 30 degrees with the horizontal. The components of the acceleration are constant at ax=-4 fps^2 and ay=-20 fps^2. Compute the horizontal distance covered until the stone reaches the point 60 ft

*asked on July 14, 2018* -
## Math

Can someone please explain to me how to solve this: Simplify 6P2. A) 30 B) 15 C) 12 D) 720

*asked on April 23, 2015* -
## Calculus (math)

A rescue cable attached to a helicopter weighs 2 lb/ft. A 190 lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done by lifting the man if the helicopter is 50 ft above to water.

*asked on April 26, 2013* -
## math

You roll 2 dice. The first die has 26 sides and contains the 26 letters of the English alphabet; the other die has 12 sides and contains numbers 1-12. What is the probability that you will roll a letter with one enclosed area (A, D, O, P, Q, R) and a

*asked on June 29, 2020* -
## Geometry

A swimming pool is to be constructed in the space of partially overlapping identical circles. Each of the circles has a radius of 9 m, and each passes through the center of the other. Find the area of the swimming pool.

*asked on September 28, 2014* -
## calculus

What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b. blue line labeled r starting at the origin and ending at a point a,b b|------------| | /| | / | | / | | / | | / | | r / | | / | | / | | / | | / | | / |

*asked on September 28, 2011* -
## math

Water is pumped into a cylindrical tank, standing vertically, at a decreasing rate given at time minutes r(t) = 130 - 10t ft^3/min for 0≤t≤5.The tank has radius 6 ft and is empty when t=0. Find the depth of the gasoline in the tank at t=3.

*asked on August 23, 2018* -
## Dynamics

A boy running a foot race rounds a flat curve of 50 ft radius. If he runs at rate of 15 mph, at what angle with the vertical will be inclined his body? A.) 16.75° B.) 13.67° C.) 76° show solution step by step thanks

*asked on July 14, 2018* -
## Geometry

A 12-foot ladder is leaning against the outside wall of a building. The angle of the ladder with the ground is 75 degrees. The ladder is moved so that the base of the ladder is 5.8 feet from the wall. Determine the angle created by the ladder and the

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

How does the three dimensional structure of SP3 bonds of Carbon, Nitrogen, Oxygen and Fluorine cause them to form polar or non-polar molecules? The answer must include a 3d diagram of the molecules, and a discussion of the effect of their electron

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

What function should be used to maximize the volume of an open box that has a surface area of 24 and has a square bottom? Not sure how to do this, a step by step answer would be great. Thanks!!

*asked on August 19, 2016* -
## smu

In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash

*asked on December 19, 2011* -
## Trig

In ABC, vertex C is a right angle. Which trigonometric ratio has the same trigonometric value as Sin A? A Sin B B Cosine A C Cosine B D Tan A

*asked on December 13, 2011* -
## geometry

The sum of the measures of the interior angles in a polygon is 540 degrees. How many sides does the polygon have?

*asked on December 13, 2010* -
## math

What 2D figure would result if you sliced a right rectangular prism horizontally?

*asked on June 30, 2020* -
## math

what is the result when you add 0 to both sides of an equation?

*asked on June 26, 2020* -
## Algebra

If (4,2) is a point on the graph of y=f(x), which of the following points must be on the graph of y=f(2x). a) (4,1) b) (8,2) c) (2,2) d) (4,4)

*asked on September 10, 2019* -
## math calculus

Let f be twice differentiable with f(0)=12, f(3)=9, and f '(3)=4.Evaluate the integral upper limit 3 and lower integral 0 xf'' (x)dx

*asked on September 13, 2018* -
## Physics

During a typical afternoon thunderstorm in the summer, an area of 76.0 km2 receives 1.42 * 10^9 gal of rain in 18 min. How many inches of rain fell during this 18 min period?

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

t) Let a , b , c and y be the three dimensional vectors a =4j +2k ,b =−3i +4j +4k ,c =3i −j ,y =8i −7j Perform the following operations on these vectors: (a) c⋅a +a⋅y = (b) (a ⋅b )a = (c) ((c⋅c)a )⋅a =

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

Randall wants to mix 57 lbs of nuts worth $1 per lb with some nuts worth $6 per lb to make a mixture worth $5 per lb. how many lbs of $6 nuts must he use?

*asked on May 20, 2016* -
## English II B

A student has completed a freewriting exercise. The result is a paragraph exploring the general theme of war in a literary text. What is the next step in the writing process? 1.gathering details 2.beginning an outline 3.writing an introduction 4.narrowing

*asked on April 3, 2014* -
## English II B

What is the term for a magazine that is published on the computer? 1. computerized slide show 2. online publication 3. electronic portfolio 4. electronic bulletin board

*asked on April 3, 2014* -
## Us history

Define unicameral legislature and bicameral legislature. Which type of legislature did must states have? I cant find what type of legislature did the states have

*asked on October 13, 2013* -
## algebra

A boat can travel 114 miles upstream in the same time that it can travel 186 miles downstream. If the speed of the current is 6 miles per hour, find the speed of the boat without a current.

*asked on August 17, 2011* -
## math

solve the equation by factoring. 3x(x-5)=6x^2-16x

*asked on September 10, 2011* -
## Calculus

1/f = 1/p + 1/q What is the rate of change of p with respect to q if q=2 and f=4?

*asked on October 10, 2008* -
## Math

Troy measures the length of a toy dog in centimeters. It is 6 centimeters long. He measures again to find the measurement in inches. The toy dog is how many inches?

*asked on April 24, 2020* -
## math

1.integral cos(x)sqrt(sin(x))dx. upper limit pi and lower limit 0 2.integral 1/sqrt(x)(sqrt(x) +1)^2. Upper limit is 4 and lower limit is 1.

*asked on September 10, 2018* -
## Physics

The average distance between Earth and the Sun is 1.5 ✕ 10^11 m. a) Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. b) What is this speed in miles per hour?

*asked on August 26, 2018* -
## Math

Differentiate y=13x^2-5x+8

*asked on July 25, 2018* -
## Social Studies

Tax money that is spent in the community y is called an ____tax

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

arctan(y)=x+c To solve for y, would it just be: y=tan(x+c)?

*asked on January 17, 2017* -
## Algebra

The Pi (π) Club at Math High School was planning a fundraiser to sell pepperoni pizza. A pizza company donated enough ingredients to make the equivalent of 300 extra large pepperoni pizzas (16” diameter). In trying to determine the number of pizzas of

*asked on June 22, 2016* -
## calculus

You have been hired by a farmer to design a fenced-in rectangular enclosure for emus. The emus will require 720 square feet of area in which to roam, and the fence will cost 20 dollars per foot. The rectangular area will adjoin an existing wall, so a fence

*asked on November 17, 2015* -
## Chemistry

Calculate the pH of the the solution that results from titrating 50 mL of 0.6 M HCN(aq) with 0.2 M NaOH At 0.00 mL of NaOH At 85 mL of NaOH. At 150 mL NaOH. At 160 mL of NaOH

*asked on March 12, 2015* -
## Algebra

Factor: -3x^2 - 18x + 15

*asked on February 15, 2015* -
## math

the width of a rectangle is 4cm and the length is 8 cm if both the width and the length are increased by equal measures, the area of the rectangle is increased by 64 cm 2. find the length and width of the larger rectangle

*asked on October 26, 2014* -
## Physics

A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize

*asked on March 9, 2014* -
## Scientific Notation

I got all of them so far EXCEPT this one... help? Thank you! Convert the following into scientific notation: 1/137

*asked on January 23, 2013* -
## Math (URGENT)

write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

*asked on January 6, 2011* -
## Math

write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

*asked on January 6, 2011* -
## algebra 2

teresa and julia are among 10 students who have applied for a trip to washington DC. Two students from the group will be selected at random for the trip. What is the probability that teresa and julia will be the 2 students selected /

*asked on April 23, 2009* -
## science

Whats the best site to go on if you want to learn about the elements?

*asked on March 19, 2009* -
## Calculus

If d/dx(f(3x^5))=9x^4 Find f'(x)

*asked on October 13, 2008* -
## Calculus

C(x) = 16x^(1/2) + x^2/1000 Find x to meet the minimum cost

*asked on October 13, 2008* -
## Calculus

C(x)= 16sqrt(x) + (x^2)/1000 Find the production level that will minimize the average cost

*asked on October 10, 2008* -
## Math

How do I express these in scientific notation AND Log10 form? 1) ln(8.1) 2) 32.8 x 10^-2 + 3.15 x 10^-1 3) 10^-2 x 10^4.5 4) 10^-45 5) 8^2.34 Please show some effort, and please stop posting under multiple names.

*asked on January 21, 2007* -
## Math

How do I express these in scientific notation AND Log10 form? 1) ln(8.1) 2) 32.8 x 10^-2 + 3.15 x 10^-1 3) 10^-2 x 10^4.5 4) 10^-45 5) 8^2.34 I will be happy to critique your work here. Most of these require conversion. Do the math, and let your calculator

*asked on January 21, 2007* -
## math

what is the result when you add 0 to both sides of an equation? I asked this already, but I would like a deeper explination

*asked on June 26, 2020* -
## Math

Two spheres are used in a certain machine. One has a volume of 7 cm3 and the other has a volume of 189 cm3. The radius of the small sphere is what fraction of the radius of the large sphere?

*asked on May 12, 2020* -
## Math

The four shapes to the right are each drawn with a horizontal base and a vertical height. Figure A is a right-angled triangle, Figure B is an isosceles triangle, Figure C is a square, and Figure D is a rectangle. The figures are not drawn to scale. Using

*asked on May 12, 2020* -
## Biology

A farmer plants a field of corn and fertilizes it with a low-nitrogen fertilizer. The corn receives plenty of sunlight and water but does not grow well. What might be preventing the corn from growing?

*asked on March 23, 2020* -
## Algebra

If (4,2) is a point on the graph of y=f(x), which of the followint points must be on the graph of y=f(2x).

*asked on September 10, 2019* -
## precalc

how to find difference quotient for: f(x) = 1/x+3

*asked on August 29, 2019* -
## Precalc

find difference quotient f(x) = 1/x+3

*asked on August 29, 2019* -
## Science

Common suspension and their uses

*asked on June 18, 2019* -
## Genealogy

What is the best free of charge way to look up past birth records?

*asked on May 28, 2019* -
## science

Can someone describe how a sound wave travels through a medium to create sound. Can you also provide a descriptions of vibrations, longitudinal waves, compressions, rarefactions, and direction of movement in your response. That way I could understand it

*asked on May 15, 2019* -
## science

why is it advisable to use plasticwares instead of the conventional glasswares in spectrophotometry?

*asked on May 12, 2019* -
## science

if 2 north poles are brought together, is the resultant pole strength of the combination equal to the sum of their pole strengths?

*asked on May 3, 2019* -
## Science

When a bar magnet is cut into two halves repel each other. Why? What becomes of the original north and south poles of that magnet??

*asked on May 3, 2019* -
## Science

Index of refraction is defined as the ratio of the speed of light in free space and its speed in the medium. What is the speed of light in a medium with n= 1.33?

*asked on May 2, 2019* -
## Science

A ray of light hits a plane mirror lying across a floor 2m from the vertical wall. The angle of incidence of the ray is 40 degrees. At what point on the wall will the reflected light fall? Express the answer in terms of height from the floor.

*asked on May 2, 2019* -
## Math

convert feet and inches to only feet. a) 17 ft 6 in

*asked on March 8, 2019* -
## Social Studies

How did the role of the church in education change over time? A. Universities changed from being independent to being part of the church. B. Priests became the only teachers at universities. C. Schools began to provide education beyond religious

*asked on January 7, 2019* -
## math

Find a substitution w and constants k,n so that the integral x^2sqrt(1-4x^3)dx has the form ∫kw^n dw .

*asked on September 13, 2018* -
## math

Find the integral given below. integral cos^2(7x+1)dx

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

Find the exact value of integral t^2(2)^(-t^3). Upper limit is 1 and lower limit is 0.

*asked on September 9, 2018* -
## math

Integrate following integrals. 1.integral ax+b/(sqrt(ax^2+2bx+c)dx 2.integral 1+x/(1+x^2)dx 3.integral e^x+1/e^x dx

*asked on September 8, 2018* -
## math

Evaluate the integral given below. integral(x^2+13)^2dx

*asked on September 8, 2018* -
## math

Find the integral given below. 7xe^(−4x^2)dx

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

(a) Find the general solution of the differential equation d y/d x =10x+5 (b) Find the solution satisfying y(1)=13

*asked on September 7, 2018* -
## Physics

A commonly used unit of mass in the English system is the pound-mass, abbreviated lbm, where 1 lbm = 0.454 kg.What is the density of gasoline in pound-mass per cubic foot? (Assume the density of gasoline is 7.40 ✕ 10^2 kg/m3.)

*asked on August 27, 2018* -
## Physics

Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 7.5 cm/year. a)What distance does it move in 1 s at this speed? b)What is its speed in kilometers per million years?

*asked on August 27, 2018* -
## Physics

During a typical afternoon thunderstorm in the summer, an area of 76.0 km2 receives 1.42 * 10^9 gal of rain in 18 min. How many inches of rain fell during this 18 min period?

*asked on August 27, 2018* -
## Math

Calculate the indicated Riemann Sums for the function g(x)=4-x^2 a)one rectangle b)two rectangles

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

Find the equations of the tangent lines to the following curves at the indicated points. xy^2 = 1 at (1, −1)

*asked on June 27, 2018* -
## Math

Compute the angle between the vectors i −j +k and −i −j −k . angle=

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

The average length of the eight words Betty was asked to spell was 9 letters. The first seven words had the following lengths: 8 letters, 9 letters, 6 letters, 10 letters, 7 letters, 9 letters, and 11 letters. What was the length of the eighth word?

*asked on April 21, 2018* -
## math

I have supplementary angles where the measure of one angle is ¼ the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

*asked on February 25, 2018* -
## math

In a class of 20 students, the average (arithmetic mean) score on a test is 84 points. If 6 students each scored 100 points and 4 students each scored 50 points, what is the average of the scores of the remaining students?

*asked on February 24, 2018* -
## math

56 is 15.625 percent of what number?

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

A student’s score on the first four mathematics tests of the year were 80, 95, 92 and 89. What must the student score on the fifth test so that the mean score for all five tests is exactly 90?

*asked on February 8, 2018* -
## English

So I'm looking for a work of art (painting, movie, literature, poem, etc.) from 1990 to modern day that has one of these traits: - Feelings or intuition over reason - Champions individual freedom and worth of the individual - Civilization as artificial -

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

50 is what percent of 13?

*asked on December 5, 2017* -
## math

What is the area of a quadrilateral with vertices at (1, 1), (4, 1), (7, 5) and (4, 5)?

*asked on December 4, 2017* -
## math

William is traveling at a rate of 75 miles per hour. How fast is William traveling in feet per second?

*asked on December 4, 2017* -
## math

If you buy a pair of shoes on sale for $48. The price is discounted 25% and the sales tax is 7%. Which of the follwoing statements would be true? Answer choices 1. The final price would be lower if you add the 7% sales tax first and take the 25% discount

*asked on December 4, 2017*