# Kris

Popular questions and responses by Kris-
## math

when the sum of 5 and 6 is subtracted from the product of 5 and 6 what is the difference

*asked on August 24, 2009* -
## algebra

This isosceles triangle has two sides of equal length, a, that are longer than the length of the base, b. The perimeter of the triangle is 15.7 centimeters. The equation 2a + b = 15.7 can be used to find the side lengths. If one of the longer sides is 6.3

*asked on October 13, 2014* -
## chem

Given an aqueous solution in which the [H+] = 2.5EE-7 M, what is the molar hydroxide ion concentration

*asked on May 5, 2013* -
## AP CHEMISTRY

Commercial brass, an alloy of Zn and Cu, reacts with hydrochloric acid as follows. Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g) (Cu does not react with HCl.) When 0.5093 g of a certain brass alloy is reacted with excess HCl, 0.0953 g ZnCl2 is eventually isolated.

*asked on August 1, 2013* -
## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 22, 2016* -
## chemistry

What is the conjugate acid for NH2- ? N3- NH2- NH4+ H+ I thought it was NH4+ but it was wrong. Isn't it suppose to be NH3+ but they don't have on this choices.

*asked on October 4, 2015* -
## Calculus

Find an equation of the tangent line to the curve at the given point. y = 6e^x cos x, (0, 6)

*asked on November 7, 2011* -
## Algebra

How long will it take for the population of a certain country to double if its annual growth rate is 1.5%? Round to the nearest year. Use the exponential growth model P(t) = P0e^kt

*asked on June 10, 2010* -
## chemistry

You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 800 grams. The total mass of the set-up is 1000 grams. The chemical is ignited by means of a magnifying glass

*asked on August 1, 2013* -
## Chemistry

List in increasing order of expected Rf values in a TLC experiment: salicylic acid, toluene, and benzophenone.

*asked on July 1, 2013* -
## Angle of elevation

A rocket fired straight up is tracked by an observer on the ground a mile away. a)Show that when the angle of elevation is theta, the height of the rocket in feet is h=5280tan(theta).

*asked on February 6, 2014* -
## Chem

Can you check to see if I'm correct? Which of these substances are elements? a. silicone b. quartz c. iodine d. water e. silicon f. lead is the answer: c, e, and f?

*asked on September 10, 2015* -
## Chemistry

Hi! I am having some trouble with this question, can you please help me? Which of the following describe chemical properties? Check all that apply. - Iodine (a purple solid) becomes a purple gas. - Titanium is less dense that iron . - Water freezes at 0'C

*asked on September 10, 2015* -
## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

*asked on February 3, 2011* -
## Physics

In a friendly neighborhood squirt gun contest a participant runs at 7.8 m/s horizontally off the back deck and fires her squirt gun in the plane of her motion but 45' above horizontal. The gun can shoot water at 11 m/s relative to the barrel, and she fires

*asked on October 9, 2017* -
## Physics

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

*asked on September 5, 2016* -
## math

evaluate without using a calculator [log(5)4 x log(2)10 ]/ [log(25)√10]

*asked on July 18, 2013* -
## Math

the difference between 3 times a number and 11 is 10

*asked on November 5, 2012* -
## physics

A speed skater moving across frictionless ice at 9.0 hits a 6.0 -wide patch of rough ice. She slows steadily, then continues on at 6.1 m/s. What is her acceleration on the rough ice?

*asked on September 11, 2012* -
## chemistry

A sample of gas with a mass of 1.62 g occupies a volume of 941 mL at a pressure of 748 torr and a temperature of 20.0 C. What is the molar mass of the gas?

*asked on July 26, 2012* -
## Chemistry

Is "sharpening a pencil" more of a physical change than souring of milk, fermenting of grape juice or rusting of iron? Thanks anyone!

*asked on July 24, 2010* -
## Math

Felicia traveled 7 kilometers to school 1/10 of that time she walked and 9/10 of the distance she rode a bus. A. How far did Felicia walk? B. How fare did she ride?

*asked on December 8, 2009* -
## business

what is A series of stages in which a products sales revenue and profits change over time.

*asked on July 6, 2008* -
## Math

The only way to get to Ship Island is to take a boat, which is free for 2 and under, $17 for children 3 to 10 years old, $25 for seniors 62 and over and $25 for everyone else. Debbie paid $116 for 6 people in her family to go to the island for the day. Is

*asked on January 21, 2018* -
## Math

A computer is purchased at 2000$. After each year, the resale value decreases by 25%. What will the resale value be after 3 years?

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

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 26, 2016* -
## Chemistry

Name three properties of metal for which metallic bonds are responsible

*asked on March 4, 2015* -
## chemistry 12

a chemical reaction released 50.0kJ of energy as it heated a sample of water from 17.0 degrees celsius to 75.0 degrees Celsius, what mass of water was heated? I have no clue as to how to do this! can anyone help?

*asked on September 4, 2014* -
## statistics

Use a table of t-values to estimate the P-value for the specified one-mean t-test. Left-tailed test, n=12, t= -3.412. a=p0.005. c= 0.005

*asked on February 21, 2014* -
## economics

What is the opportunuity cost if you make 15 a hour but you decide not to work for a 1 hour and go to the movie which cost 10 what is the opportunity cost?

*asked on November 2, 2013* -
## Calculus

(cos πx + sin πy)4 = 54; Implicit Differentation

*asked on October 9, 2013* -
## math

a local summer baseball team plays 20 games each season. so far, they have won 9 games and lost 2. how many more games must they play win this season to win at least 75% of all their games?

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

Bacterial digestion is an economical method of sewage treatment. 5CO2(g) + 55NH4+(aq) + 76O2(g) right arrow Bacteria C5H7O2N(s) + 54NO2-(aq) + 52H2O(l) + 109H+(aq) bacterial tissue The above reaction is an intermediate step in the conversion of the

*asked on August 1, 2013* -
## chemistry

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield?

*asked on August 1, 2013* -
## math

Sams shoes makes a profit of 38$ on every pair of athletic shoes it sells. How many pairs of shoes must Sam sell to earn a profit of 950?

*asked on June 30, 2013* -
## chemistry

Zn(s) + 2AgNO3(aq) = 2Ag(s) + Zn(NO3)2 (aq) It would require_____g of zinc to produce 5.40g of silver.

*asked on June 12, 2013* -
## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

*asked on April 16, 2013* -
## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

*asked on April 16, 2013* -
## Literature

In I Am Nujood, The urban elites Nujood encounters in the courtroom and at the Yemen Times lead very different lives from those of Nujood and the country people of Yemen. How are these “enlightened” people actually disconnected from the rest of their

*asked on April 16, 2013* -
## Literature

In I Am Nujood, what enables Shada to take up Nujood’s cause so quickly and effectively? How does Shada, whom Nujood calls her “second mother,” open up Nujood’s world? Who else teaches Nujood about what a “real” family can be like?

*asked on April 16, 2013* -
## Literature

In I Am Nujood, Nujood says that when her family was driven from Khardji, they lost “a small corner of paradise.” How do the injustices endured by Nujood’s father and brother, Fares, show that life in a patriarchal society can be hard not just for

*asked on April 16, 2013* -
## Algebra Multiple choice revised!! HELP

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give

*asked on March 28, 2013* -
## Algebra

The table shows men's shoe sizes in the United States and the corresponding European shoe sizes. Let y = f(x)represent the function that gives the men's European shoe size in terms of x, the men's U.S. size. Men's U.S. shoe size, Men's European shoe size 8

*asked on October 27, 2012* -
## Calculus

Find the critical numbers of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) h(p) = (p − 2)/(p^2 + 9)

*asked on December 5, 2011* -
## Math

Which of the following shows estimating 287 + 491 by using compatible numbers?

*asked on September 22, 2011* -
## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

*asked on February 3, 2011* -
## math

Have to draw a parallelogram that is not a rectangle with a base of 6cm and a hieght of 4cm

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

A person’s blood glucose level and diabetesare closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. After a 12-hour fast, the random variable x will have a distribution that is

*asked on November 29, 2010* -
## Calculus HARD NEED HELP

The volume of a cone of radius r and height h is given by V=(1/3)pir^2h. If the radius and the height both increase at a constant rate of 2cm/s at which rate in cubic cm/s is the volume increasing when the height is 8cm and the radius is 6cm. So The answer

*asked on October 17, 2010* -
## Calculus

The volume of a cone of radius r and height h is given by V=(1/3)pir^2h. If the radius and the height both increase at a constant rate of 2cm/s at which rate in cubic cm/s is the volume increasing when the height is 8cm and the radius is 6cm. So The answer

*asked on October 17, 2010* -
## math

how do you cange 14/30 into a desimal and precent?

*asked on September 13, 2010* -
## accounting

E4-1 The trial balance columns of the worksheet for Briscoe Company at June 30, 2008, are as follows. BRISCOE COMPANY Worksheet For the Month Ended June 30, 2008 Trial Balance Account Titles Dr. Cr. Cash $2,320 Accounts Receivable 2,440 Supplies 1,880

*asked on September 13, 2010* -
## physic

How much current will be flowing through a 57.0m length of copper wire with radius 5.7mm if it is connected to a source supplying 620V. (The resistivity of copper is 1.68x10^-8ohm's.m

*asked on August 4, 2010* -
## Intermediate Algebra

Rewrite the following as an equivalent logarithmic equation.Do not solve. Show your work. m^n=r

*asked on June 10, 2010* -
## chemistry

Only 6.1 mg of calcium oxalate, Ca(C2O4) dissolves in 1.0 L of water at 25 Celsius. What is the solubility product of calcium oxalate?

*asked on May 23, 2010* -
## physics

A long horizontal hose of diameter 4.6 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1 cm. Water squirts from the nozzle at velocity 20 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a)

*asked on April 29, 2010* -
## math

terry shared three pizzas with some friends. terry ate 1/4 of them. how much pizza did terry eat?

*asked on December 4, 2009* -
## Math

A number has four digits. the sum of the first and last digits is twice the second digit. The second digit is 2 less than the third digit. The last digit is twice the first. Some of the digits are alike. what is the number??

*asked on February 24, 2009* -
## Language Arts/Capitalization

Quick question: When writing CHRISTIAN CLUB is it Christian Club or Christian club? Thank you

*asked on November 30, 2007* -
## algebra

what is the perimeter of a square with sides that are sqrt3 + sqrt5 on every side? what is the area? not perimeter area= (sqrt3 + sqrt5 )(sqrt3 + sqrt5 ) Multiply it out. I will be happy to critique your thinking and work.

*asked on June 29, 2007* -
## algebra

evaluate and simplify 6 - square root20 ----------------- 2 The square root of 20= sqrt (4*5)= sqrt4 * sqrt5= 2 sqrt5 The square root of 20= sqrt (4*5)= sqrt4 * sqrt5= 2 sqrt5

*asked on June 29, 2007* -
## Adverb or Adjective

Can you please tell me what "first" is in the following sentence. It was up to another American, Robert Fulton, to develop the first widely successful steamboat. I think "first" is an adjective modifying steamboat. Thanks, Kris You are correct thank you so

*asked on March 16, 2007* -
## Geography

Describe the civil war in Syria and Yemen. How are they similar? How are they different?

*asked on April 9, 2020* -
## math

johnny has 5 apples and he gives 1 away

*asked on December 10, 2019* -
## algebra

Through (5, -4), parallel to 8x + 3y =31

*asked on September 22, 2019* -
## Math

Suppose that f(x)=x−7x^[1/7] (A) Find all critical values of f. (B) Use interval notation to indicate where f(x) is increasing and also decreasing. (C) Find the x-coordinates of all local maxima and local minima of f. (D) Use interval notation to

*asked on March 27, 2019* -
## Math

Suppose that f(x)=x^[1/3](x+3)^[2/3] (A) Find all critical values of f. If there are no critical values, enter None . If there are more than one, enter them separated by commas. Critical value(s) = (B) Use interval notation to indicate where f(x) is

*asked on March 27, 2019* -
## Physics

Elastic behavior: when loads are small how much deformation occurs? What materials deform least?

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

A pulley system shows is use to raise a load of 600N through 8m. If the effiency I 90%. Calculate a, machincal advantage b. Workdone by the effort c. Effort applied

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

carlos makes geometrical artworks out of sheet metal. the dimensions of a full size sculpture will be 6 times the dimensions of the model shown below. He will not use any metal for the bottom base of the cylinder. How many square feet of sheet metal will

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

A tiling company specializes in multi-colour tile patterns. A small hotel is interested in the patterns below for its square shaped reception area. How many dark coloured tiles will there be if the reception area needs an area of 18 x 18.

*asked on December 15, 2017* -
## Algebra II

(3-4yi)(6+7i)-[(2-3yi)-3(1+7i)] Express it in a+bi form I got 19+42i-21yi+28y but I do not know how to express it in a+bi form, can you please help me with it?

*asked on October 30, 2016* -
## Stoichiometry

What mass of water is produced from 10g of sulfuric acid ?

*asked on July 1, 2016* -
## math

A runner has a stride length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half. How many strides would it take to finish the second half of the marathon? Hint: 5 ft is 5.0 x 10 4.5 is 4.5 10

*asked on May 4, 2016* -
## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 23, 2016* -
## engineering math

What is the increase in temperature necessary for a hydrogen gas, initially at 0°C, to increase its volume by 5% at constant pressure?

*asked on August 9, 2015* -
## academic excellence

ms. sue the questions I need help with you answered o Jan 27, 2015 can you help me with the same questions? there are 20 of them. I saw them online.

*asked on May 27, 2015* -
## Math - Help Me Please

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## math- please help me

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## Math - Help Please

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## science

Calculate the concentration of all species in a 0.145M solution of H2CO3

*asked on March 18, 2015* -
## Chemistry

Oil and water don't mix. We say that oil is

*asked on March 14, 2015* -
## math

3000 for 3 years at 1.8% compounded monthly

*asked on March 3, 2015* -
## 3rd grade math

mrs. lens wants to put a ribbon around the edge of a pillow. which tool and unit should she use to measure the perimeter of the pillow? measuring tape or ruler or yard stick?

*asked on February 17, 2015* -
## Calculus II

Find the indefinite integral. ∫xe^-4xdx

*asked on February 4, 2015* -
## Science

A sample of steam with a mass of 0.530g and at a temperature of 100 ∘C condenses into an insulated container holding 4.40g of water at 5.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C). What is the final temperature of the mixture, assuming no

*asked on January 20, 2015* -
## maths

I am fraction they say i m nt proper i may be improper but when u solve me u get number seven my number is 21.wht fraction am i?

*asked on December 25, 2014* -
## physics

A helicopter flies south at 185km/hr relative to the ground. The wind is blowing 60km/hr to the west compared to the ground. What is the helicopter's speed to an observer on the ground?

*asked on December 12, 2014* -
## Math

Ken planted 8 flowers and 4 shrubs in his mother's garden. He ran out of fertilizer before he planted 2 of the flowers and 1 of the shrubs, so he planted them without fertilizer. What percentage of plants were planted without fertilizer? A. 12.5% B.25% C.

*asked on December 10, 2014* -
## physics

A student fires a rocket at 24 degrees above the horizontal. The 10kg rocket comes out of the gun barrel at 1000 m/s, and accelerates 15 m/s^2 uniformly until it burns out 2 seconds later. It then is acted apon by gravity until it hits the ground. I need

*asked on November 20, 2014* -
## Chemistry (urgent)

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

*asked on October 29, 2014* -
## Chemistry

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

*asked on October 29, 2014* -
## math

How many packs of DVDs can you buy with 198 dollars if one pack costs 18 dollars

*asked on October 23, 2014* -
## Chemistry (urgent)

Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride.

*asked on October 23, 2014* -
## sixth grade math

3 3/5 * 5/6 = 90/45 Do I have correct answer?

*asked on September 24, 2014* -
## sixth grade math

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 5/6 * 2/3 = 11/10 3. 7/8 * 3 1/3 = 35/27 Do I have the correct answers? If not can someone show how to solve them?

*asked on September 17, 2014* -
## sixth grade math

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 1/5 * 3/5 = 18/25 3. 1 5/6 * 2/3 = 11/10 Do I have the correct answers? If not can someone show me how to solve them?

*asked on September 17, 2014* -
## Math

What is the sum of all the positive numbers smaller than 100,000 where all digits can only be 1 or 0.

*asked on September 11, 2014* -
## chemistry

How many grams of glycolic acid are needed to react with 30 mL of 0.1 M NaOH?

*asked on July 2, 2014* -
## math

is 100 over 1000 10%?

*asked on April 27, 2014*