# Iris

Popular questions and responses by Iris-
## Math

Hayden had 2 1/2 gallons of water in his watering can. The seed packet said to use 1/4 of a gallon for peppers and 5/8 of a gallon for tomatoes. Hayden then used some of the water for lettuce. If Hayden had 3/4 gallons of water left over, about how much

*asked on September 28, 2015* -
## History! Help!

Which of the following lists the start of the agricultural revolution according to absolute chronology? A. AD 500 B. after hunting and gathering C. post-Spanish exploration D. 5000 BC

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

1. which proportion can be used to determine what number is 15% of 30 15/30 = x/100 15/100 = x/30 15/100 = 30/x 30/100 = 15/x 2. which equation can be used to determine what number n is 40% of 64? (40)(64) = n 40 divided by 64= n 0.40(64)= n 64n = 0.40

*asked on November 12, 2018* -
## History! Help!

The Caddo were an American Indian group in Texas that practiced agriculture and build permanent houses. What can be inferred about the group? A. It created a large population B.It formed a small and defenseless population C.It had no contact with other

*asked on September 7, 2016* -
## History! Help!

The Atakapans occupied the region from the Sabine river to the A. San Jacinto river B. Red river C. Colorado river D. Trinity river Both the Karankawa and Atakapans relied heavily on which resources? A.rival groups B.fish and shellfish C.settlers D.trees

*asked on September 2, 2016* -
## math

Which proportion can be used to determine what number is 15% of 30? 15/30 = x/100 15/100 = x/30*** 15/100 = 30/x 30/100 = 15/x Which equation can be used to determine what number, n, is 40% of 64? (40)(64) = n 40 divided by 64 = n 0.40(64) = n*** 64n =

*asked on November 12, 2018* -
## Physics

An 83-kg fireman slides down a fire pole. He holds the pole, which exerts 500-N steady resistive force on the fireman. At the bottom he slows to a stop in 0.49 m by bending his knees. Determine the acceleration of the fireman while sliding down the pole.

*asked on September 14, 2015* -
## Math

PLEASE DON'T JUST SHOW ANSWER PLEASE SHOW HOW TO DO IT PLEASE Mrs. Walters drove 360 miles on 25 gallons of gas. Mr. Walters drove 480 miles on 32 gallons of gas. a.Find the mileage per gallon for Mrs. Walters car. b.Find the mileage per gallon for Mr.

*asked on November 9, 2018* -
## Texas History

Why did Santa Anna attack the Alamo? A. It had a supply of gold. B. It was an important strategic location. C. It was his family’s ancient homeland. D. It would ensure a glorious victory.

*asked on November 18, 2016* -
## Social Studies

How did the idea of Manifest Destiny influence settlement in the United States?

*asked on June 4, 2015* -
## Physics

A sound of constant frequency is produced by the si-ren on top of a firehouse. Compared to the frequen-cy produced by the siren, what is the frequency heard by a firefighter approaching the firehouse? What if the firefighter is driving away?

*asked on March 11, 2013* -
## Science

NO ONE HAS ANSWERED 1. How do microorganisms affect the quality of soil? by breaking down the remains of dead organisms*** by creating tunnels by absorbing water by increasing mechanical weathering 2. How does the C horizon form? Rainwater washes clay and

*asked on November 11, 2018* -
## Math

How do you write 24% as a decimal? 2.4 0.24*** 0.024 How do you write 135% as a decimal? 1.35*** 13.5 0.135 How do you write 4% as a decimal? 0.4*** 0.40 0.04 Which fraction is equivalent to 72%? (No answer, not sure on this one.) 16/25 18/25 19/25 Which

*asked on November 11, 2018* -
## Math

Please help guys ❤ 1) What is the GCF of 32 and 56? A) 2 B) 4 C) 8 D) 14 2) The highest temperature ever recorded in Death Valley, California, was 121°, while the lowest ever recorded there was 13° below zero. Which integers BEST represent these

*asked on November 10, 2018* -
## Genetics

In chickens, the Leghorn variety has white feathers due to an autosomal dominant allele. Silkies have white feathers due to recessive allele in a second gene. If true-breeding white leghorn is crossed to a true breeding white silkie, What is the expeected

*asked on October 10, 2012* -
## math

you need exactly A 1680 ft3 aquarium for you fish. at the pet store you see four chices of aquariums, but the volume is not listed. the length, width, and height are listed on the box. which of the following aquarioums would fit your needs? a)

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

If y(x-1)=z then X =

*asked on October 31, 2011* -
## Social Studies Help

The social unit most responsible for teaching the custom and traditions of a culture is? (A) The family (B) The government (C) The army (D) The schools Two important features of a culture are? (A) Weather and writing (B) Language (C) Economy and Climate

*asked on December 15, 2015* -
## Pre-Calculus

Convert to rectangular: theta=2pi/3

*asked on November 30, 2016* -
## Chemistry 30

How do I complete an ICE table for a solution of nitrous acid, HNO2, one of the acids associated with acid deposition?

*asked on December 31, 2012* -
## Social Studies

Along the southern coast of Brazil the central plateau descends in high steep escarpments it towers over the waves and moves back in ridges leveling off from the peaks of the coastal ranges as it continues along to the northern regions however it gradually

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

A brick wall measuring 3 ft by 11 ft is to be built. The brick measures 4in by 6 in. How many bricks will it take to complete the walkway? math - Ms. Sue, Monday, June 24, 2013 at 2:39pm Are we building a wall or a walkway? math - iris, Monday, June 24,

*asked on June 24, 2013* -
## math

If a school has lockers with 50 numbers on each combination lock, how many possible combinations using three numbers are there.

*asked on December 6, 2011* -
## science

An empty beaker weighs 20g and when filled with a liquid weighs 65g. The volume of the liquid is found to be 25cm³. Determine the density of the liquid

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

Christine found three pieces of cable in her tool drawer. Here are their lengths (in meters). What is the total length of the three pieces?

*asked on June 19, 2012* -
## Math

Two triangles of the same shape are always A. similar B. equilateral C. congruent D. equal

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

Can somebody please help me with this. thank you 89___89 the second 89 has a solid line on top of the number. Is this equal or greater than or equal to 89 without the line No one has answered this question yet.

*asked on July 5, 2013* -
## Math

What is the LCM of 4 and 10? What is the GCF of 8 and 12?

*asked on November 9, 2018* -
## Calculus

Use a graphing utility to graph the polar equation shown below. r = cos 5Θ + n cos Θ, 0 ≤ Θ ≤ π For the integers n = -5 to n = 5. As you graph these equations, you should see the graph change shape from a heart to a bell. I'm sorry. I'm having

*asked on December 6, 2016* -
## Math

Each wheel on Harley's bike has a radius of 60 cm. How many revolutions does each bike make when Harley bikes 500 cm? A. 500/120pi B. 1000/120pi C. 50000/120pi D. 100000/120pi

*asked on August 7, 2018* -
## Calculus

Given the vectors u = and v = , find 3u + 2v.

*asked on October 28, 2016* -
## math

James invested $4,000 at 5% interest per year; how long will it take him to earn $200 in simple interest?

*asked on November 1, 2011* -
## math

A discount store takes 50% off of the retail price of a desk. For the store's holiday sale, it takes an additional 20% off of all furniture. The desk's retail price was $320. How much is the desk on sale for during the holiday sale?

*asked on October 31, 2011* -
## British Literature

In a Scandal in Bohemia Dr. Watson says that Holmes A)has a Bohemian soul B)has the powers of a warlock C)sees but does not deserve D)takes the kings case to make money 2. Christina Rosetti's No Thank You John and Promises Like Pie-Crust both have A)a

*asked on September 2, 2011* -
## Pre-Calculus

Use a graphing utility to graph the function y = d + a sin (bx - c) for different values of a, b, c, and d. Write a paragraph describing the changes in the graph corresponding to changes in each constant.

*asked on August 14, 2016* -
## chem 11

Chloroform, CHCl3, has a boiling point of 62 oC, whereas methane, CH4, has a much lower boiling point of -164 oC. Using diagrams, explain the difference between the two boiling points.

*asked on January 4, 2017* -
## Pre-Calculus

The cost of sending a package overnight is $14.40 for the first pound and $3.90 for each additional pound or portion of a pound. A plastic mailing bag can hold up to 3 pounds. The cost f(x) of sending a package in a plastic mailing bag is given by the

*asked on December 12, 2016* -
## math

grace has 16 in her pocket. she has 8 red ibesm 4 green ones, and 4 blue ones. what is the minimum number of jellybeans she must take out of her pocket to ensure that she has one of each color?

*asked on November 17, 2011* -
## Math

An urn contains 7 pink and 8 black balls. Five balls are randomly drawn from the urn in succession, with replacement. What is the probability that all five balls drawn from the urn are black?

*asked on August 11, 2018* -
## Calculus

Which of the following would be the best first step when solving the following system using the substitution method? x - y = -4 ; x + 2y = 5 a. x = -4 - y b. x = -4 + y c. 2y = 5 - x d. 2y = 5 + x

*asked on November 9, 2016* -
## Pre-Calculus

Which of the following statements best describes the domain of the functions sine and arcsin? A)Sine domain is all real numbers; Arcsin domain is all real numbers. B)Sine domain is restricted; Arcsin domain is all real numbers. C)Sine domain is all real

*asked on August 30, 2016* -
## math

peter took a 1,500 mile trip in 5 days. each day, he drove 30 miles more than the day before. how many miles did he cover on the first day?

*asked on October 26, 2011* -
## Social Studies

Countries once under British rule can be members of this organization. The organization provides support with trade and economics. What is the name of the organization?

*asked on June 3, 2015* -
## Rounding Decimals

Marley and Hassan rounded the number 7.483. Marleys answer was greater than 7.438. Marleys answer was greater than 7.483, and Hassan's anser was less. Towhat place might the number have been rounded by Marley? By Hassan? Explain.

*asked on February 9, 2011* -
## Math

A 26 inch ribbon is cut into three pieces. One piece is 12 inches. The remaining two pieces must have one piece two inches longer than the other. How long is the shortest piece of ribbon?

*asked on January 27, 2011* -
## Chemistry

PLEASE HELP! What amount of water could be heated from 20 degrees C to 50 degrees C by 714 kJ of energy?

*asked on December 12, 2010* -
## science

An empty beaker weighs 20g and when filled with a liquid weighs 65g. The volume of the liquid is found to be 25cm³. Determine the density of the liquid

*asked on June 24, 2018* -
## Pre-Calculus

A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. [cot(x) – 1] / [cot(x) + 1] = [1 – tan(x)] / [1 + tan(x)], x = π/4 I solved A and I believe it's true; however, I need help with B.

*asked on October 5, 2016* -
## science

A weight of 500kg is suspended by two chains 1.5m and 2.7mrespectively.the chains are attached to a beam that is 3.746m in length. The distance from the suspension to the ground being 900m. A.Calculate the load. B.the vertical and horizontal reactions at

*asked on July 5, 2017* -
## LA

what is the difference between internal conflict and external conflict Need help A.S.A.P

*asked on June 15, 2015* -
## Social Studies

The Spanish introduced horses to North America. This is an example of _____ . In 1933, President Roosevelt created a plan called the New Deal. What impact did the New Deal have on the United States? How did Manifest Destiny doctrine contribute to the

*asked on June 3, 2015* -
## Pre-Calculus

Convert to rectangular: theta=(2pi)/3 A. y=-sqrt3 B. y=-sqrt3x C. x=sqrt3 D. x=-sqrt3y

*asked on December 2, 2016* -
## math-correction

Petrus shared his birthday cake with 5 of his friends.He gave Sandy 1/8,Mary and Paul1/10 each.He gave Jack 1/5 and Sandra 3/20.What fraction of the cake had he left.

*asked on February 12, 2013* -
## math

If a ¼ of a teaspoon is 1 ml, then how many milliliters are in 6 teaspoons

*asked on October 31, 2011* -
## Pre-Calculus

Which of the following shows the correct notation for “The limit of x^2 - 1 as x approaches 3. A. lim x^2-1 x->3 B. lim3 x->x^2-1 C. lim(x^2-3) x->x^2-1 D. lim(x^2-1) x->3 Thank you

*asked on December 12, 2016* -
## Math

Hope Mom baked a cake in rectangular shape 10 by 6. If she starts at the corner and put acndle every 2 inches how many candles will fit around the edge of the cake?

*asked on November 22, 2009* -
## vectors

If |x| = 11, |y| = 23, and |x-y| = 30, find |x+y|. Textbook answer: 20

*asked on May 20, 2018* -
## Pre-Calculus

This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 + tan^2 Θ = sec^2 Θ and 1 + cot^2 Θ = csc^2 Θ. Discuss how to remember these identities and other fundamental identities.

*asked on September 29, 2016* -
## Social Studies

What is a likely reason the Northeast region has a high population density and the cities are rich in ethnic diversity? How did the arrival of European settlers change life for indigenous people on the plains? The southern region of the United States has a

*asked on June 3, 2015* -
## algebra

NATA spent $28 on 2 dvds.At this rate how much would 5 dvds cost? At what rate did she spend her money?

*asked on September 3, 2014* -
## Math

You read 50 pages in an hour. Your sister reads 40 pages in an hour. Explain how to find out how many more pages you read than your sister reads in 1212 hour?

*asked on May 3, 2016* -
## math

it takes 1 3/4 metres of cloth to make a uniform. a)how many similar uniforms can be use from 10 metres of cloth? b)how much cloth will be left?

*asked on February 9, 2013* -
## physical

A marathon runner runs 3km in direction 0degree and them 4km in direction 90degree. total time for the race is 2 hours.so determine the total distance covered?

*asked on January 27, 2013* -
## math

the longest side of a triangle measures 2 and the shortest side measures 1. what cannot be the measurement of the angle between them? a-30 degrees b-60degrees c-70 degrees d-90degrees

*asked on November 29, 2011* -
## math

if the perimeter of a rectangular house is 44 yards, and the length if 36ft, what is the width of the house?

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

a room mesures 11ftx12ftx9ft. what is the volume?

*asked on November 17, 2011* -
## Biochem

calculate the volumes of 0.10 M acetic acid and 0.20 M sodium acetate that are needed to prepare 48-mL buffer solution with pH = 3.70. Ka for acetic acid is 1.75 x 10-5

*asked on April 22, 2011* -
## Pre-Calculus

Find P_(k+1) if P_(k)=2^(k-1)/k! (I used _ as a sign for a subscript) A. 2^(k+1)/(k+1)! B. 2^k/(k+1)! C. 2^(k+1)/k!+1 D. 2k/k!+1 Thank you

*asked on December 12, 2016* -
## Pre-Calculus

Convert to rectangular: 4=4sec theta A. y=2 B. y=4 C. x=2 D. x=4

*asked on December 2, 2016* -
## Chemistry 30

In addition to alkanes, cracking reactions may also involve alkenes, alkynes and aromatics. For each of the following reactions, draw a structural formula equation. Include all reactants and products: a) but-1-ene --> ethyne + ethane b) 3-methylheptane -->

*asked on January 2, 2013* -
## Algebra 2

Hey how would you factor this polynomial to find the zeroes of this function? x^4-5x^3+7x^2+3x-10

*asked on December 30, 2011* -
## math

roger took off at 8am driving 45mph. bill went after him 2 hours later and caught up with him at 4pm. how fast did bill drive?

*asked on November 29, 2011* -
## Teacher Math

Battery Power Problem. A certain type of thermal battery for an airplane navigation device backup power has a mean life of 300 hours with a standard deviation of 15 hours. What proportion of these batteries can be expected to have lives of 322 hours or

*asked on March 30, 2010* -
## Math

3) Distinguish between a term of an expression and a factor of an expression. Distinguish between an expression and an equation. Why are these terms important?

*asked on February 26, 2009* -
## college algebra2

a triangle whose base is 18 inches long has an area of 280 square inches. find the area of a similar triangle whose base is 6 1/4 feet long.

*asked on February 12, 2016* -
## Science

how can models help in science, why they are important, what and some examples of models.

*asked on September 18, 2015* -
## Physics

A man holds a flower pot out a window 12m from the ground. He tosses the pot upward with a speed of 5m/s. How long does it take the pot to reach the ground? How fast is it moving just before it hits? Please show steps.

*asked on September 25, 2013* -
## I can solving my problem

I'm a number grater than 45 but less than 90. I am an even number. i have 7 sets of the 16 ones. what number am I?

*asked on June 19, 2013* -
## math

__X+1____-__x-1____ x-1 x+1

*asked on November 29, 2011* -
## math

Jim and Joe were running together. Jim's average speed was 400 meters per minute.Jim started running four minutes before Joe. ten minutes after Joe started, he caught up with Jim. What was Joe's average speed?

*asked on November 29, 2011* -
## math word

beth is two years older than julio. gerald is twice as old as beth. debra is twice as old as gerald. the sum of their ages is 38? how old id beth a 3 b 5 c 6 d 8 why!!!

*asked on April 7, 2010* -
## Pre-Calculus

Which are examples of the use of parametric equations? A. Position of a person on a ferris wheel. B. Position of a ball after being thrown. C. A and B D. Neither A nor B

*asked on November 30, 2016* -
## Calculus

Given: u and v What is the measure of the angle between them?

*asked on November 5, 2016* -
## Pre-Calculus

A.Verify the identity. B.Determine if the identity is true for the given value of x. Explain. Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)],x = π I already solved A and I believe it's true; however, I need help with B.

*asked on October 5, 2016* -
## Math

Which number is equivalent to 14/4? A 3.2 , because 14 divided by 4 is 3 with a remainder of 2 B 3.5 because 14 divided by 4 is 3 with a remainder of 2 and 2/4 = 0.5 C 3.3 because 14 divided by 4 is 3 with a remainder of 3 D 3.6 because 14 divided by 4 is

*asked on December 8, 2015* -
## Social Studies

Why did most major northeastern cities in the United States develop along the coast?

*asked on June 4, 2015* -
## statistics

company A has 110 employed, company B has 750 employed and company C has 250 employed. Compute the probability that an employee selected at random comes from company A or B.

*asked on June 7, 2014* -
## Physics

A projectile is shot at a speed of 30m/s at an angle of 50 degrees above the horizontal. The projectile hits a vertical wall at a height 20m above the horizontal. Where is the wall's location? There are 2 answers.

*asked on September 25, 2013* -
## math

A brick wall measuring 3 ft by 11 ft is to be built. The brick measures 4in by 6 in. How many bricks will it take to complete the walkway?

*asked on June 24, 2013* -
## math

what is the cost in dollars to steam clean a room W yards wide and L yards long if the steam cleaners charge 10 cents per square foot?

*asked on November 17, 2011* -
## Chemistry

convert 33 miles/hour to meters/minute

*asked on September 7, 2011* -
## Pre-Calculus

Find P + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) (the k+1 and k in front of the P are subscripts) A. 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] B. 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) C. 7 + 13 + 19 + …+(6k + 1) D. 7

*asked on December 11, 2016* -
## Pre-Calculus

Given Tan(A) = 5 in Quadrant III and Sin(B) = ⅔ in Quadrant II, find Cos(A-B).

*asked on October 6, 2016* -
## math

Petrus shared his birthday cake with 5 of his friends. He gave Sandy 1/8,Mary and Paul 1/10 each.he gave Jack 1/5 and Sandy 3/20. What fraction of the cake had he left?

*asked on February 9, 2013* -
## earth science9volcanos0

when a volcano becomes dormant it is...

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

john and mary are working on a job together. if john does it alone, it will take him seven days, while mary can do it alone in five days. how long will it take them to do it together?

*asked on October 26, 2011* -
## FSU

*Explain the meetings that resulted in the Japanese seeing “Rolls-Royce, Rolls-Royce, Ford,” and how was this part of Americans “clamoring for the outlawry of war?”

*asked on February 14, 2011* -
## Math

The number of accidents that occur at the intersection of Pine and Linden streets between 3 p.p and 6 p.m. on Friday afternoons is 0, 1, 2, or 3, with probabilities of 0.84, 0.13, 0.02, and 0.01, respectively. Graph this probability distribution. What is

*asked on March 30, 2010* -
## Math

Hope Mom baked a cake in rectangular shape 10 by 6. If she starts at the corner and put acndle every 2 inches how many candles will fit around the edge of the cake?

*asked on November 22, 2009* -
## Pre-Calculus

How does the expansion of (x + y)n and (x - y)n differ? If you can offer an example that would be very helpful. Thank you

*asked on December 12, 2016*

## Pages

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