# Posts by sam

Total # Posts: 5,334

**Algebra I**

Please show me the steps to solve this: KE = ½ (900kg)*(20m/s)^2

**Algebra I**

KE = ½ (900kg)*(20m/s)^2

**Chemistry**

A student prepared a 0.03M solution of formic acid (HCHO2) and measured its PH at 25oc and it was found to be 4.67. Calculate Ka for formic acid at this temperature.what percentage of the acid is ionized in this 0.03M solution.

**Algebra I**

Average height of a species of tree (in feet) after a certain number of years Years----------Height 1 ------------- 2.1 2 ------------- 3.2 3 ------------- 6.8 4 ------------- 7.3 5 ------------- 11.2 6 ------------- 12.6 7 ------------- 13.4 8 ------------- 15.9 What is the ...

**Algebra I**

you use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is -0,993. How confident can you be that your predicted value will be reasonably close to the actual value? a. I can't be confident at ...

**Algebra I**

Which equation is the equation of a line that passes through (-10, 3) and is perpendicular to y=5x-7? a. y=5x +53 b.y=-1/5 x -7 c. y=-1/5x+1 d. y=1/5x +5.

**Algebra I**

Which equation has a graph parallel to the graph 9x + 3y = -22 a. y=3x -22 b. y=-3x + 8 c. y=1/3x + 12 d. y= -1/3x-2****

**Math**

The cooling system of a car has a capacity of 20 liters. If the system is currently filled with a mixture that is 60?% ?antifreeze, how much of this mixture should be drained and replaced with pure antifreeze so that the system is filled with a solution that is 70% ?antifreeze?

**PHYSICS**

A 15 kg block is on a ramp which is inclined at 20 degrees above the horizontal. It's connected by a string to a 20kg mass which hangs over the top edge of the ramp. With no frictional forces taken into account, what is the magnitude of the acceleration of the 20kg block?

**PHYSICS**

A spring stretches by 210cm when a 135 N object is attached. What is the weight of a rubber duck that would stretch the spring by 44.9cm?

**Algebra I**

Write is y=1/6 X +4 in standard form using integers a. -x -6y =24 b. -x+6y = 24 c. -x +6y =4 ***** d. 6x-y=24

**Math**

How much of? a(n) 60% orange juice drink must be mixed with 8 gallons of a 30% orange juice drink to obtain a mixture that is 50% orange? juice?

**Math**

The manager of a store selling tea plans to mix a more expensive tea that costs $5 per pound with a less expensive tea that costs $2 per pound to create a 140?-pound blend that will sell for $3.80 per pound. How many pounds of each type of tea are? required?

**Math**

The perimeter of a rectangular garden is 108 meters. The length is 6 meters longer than twice the width. Find the dimensions of the garden.

**Math**

What is the word form for the number 12+0.2+0.005

**Math**

When doing a calculation involving zoning laws, Tim comes across the following expression: fraction numerator a minus open vertical bar a close vertical bar over denominator a end fraction, where a is either a positive or a negative number. (A) What is the value of the ...

**math**

There were 812 adults and half as many children at a concert. There were 96 more women than children. How many men there were?

**Geometry**

I need to explain how to make a triangle using a protractor and a string and the aas congruence theorem. I'm giving no angles. I was thinking draw a line find and angle then draw another line to attach to the first line get another angle and finish off triangle draw the ...

**Physics**

An electron is acted upon by a force of 7.00×10?15 N due to an electric field. Find the acceleration this force produces in each case: The electron's speed is 1.00 km/s . a=??m/s2 The electron's speed is 2.50×108 m/s and the force is parallel to the ...

**math**

hd

**Physics**

If a kayak can travel straight across a 50m wide river and can paddle at 8 m/s and the river flow has a current of 5 m/s west what is the maximum velocity in km/h (don't forget the direction) with the help of the current? And if the current is frustrating what is the ...

**ALGEBRA I**

Which equation is represents the line that passes through the points (6,-3) and (-4,-9)? a. y+4 =3/5(x+9) b. y+4=5/3(x+9) c. y-3= 3/5(x+6)****** d. y+3=3/5 (x-6)

**Algebra 1**

Find the slope of a line that passes through (-2,-3) and (1,1).

**Physics**

Tucker, from a 20 m tower, throws a ball horizontally that travels a distance of 60 m. At what speed, in m/s, is the ball thrown?

**Math**

A dress cost twice as much as a skirt. Mrs. Mason bought 3 dresses and 2 skirts. She gave the cashier $1000 and received $300 in change. How much did a dress cost?

**Maths **

A circular pond has a radius of 13m. A path goes all the way round the circumference of the pond. The path is 1-2 m wide throughout. Find the area of the path.

**Organic Chemistry**

Procedure: 1) Accurately weigh approximately 0.40 g of Dimethyl maleate into a 50 mL round bottom flask that possesses a ground glass joint, and record the weight. 2) Dissolve the Dimethyl maleate in 10 mL of methanol, and add approximately 5 drops of 10% solution (w/v) of ...

**History**

Which most accurately describe the impact of the Crusades on the Jewish community?

**Math**

Show sin((a-b)/2) < ((a-b)/2). Why is this true?

**Math**

A boy is 42 years younger than his father .In 8 years' times , he will be 1/4 times as old as his father .Find their present ages. (Answer is boy= 6, father= 48)

**HISTORY**

Which religious denominations were important in early Georgia? Why?

**GEORGIA HISTORY**

If you lived in Georgia during the colonial era, where would you go to school if you lived in Savannah? Where would you go to school if you lived in one of the parishes that were a long boat ride away from Savannah?

**ALGEBRA**

Ralph needs to earn a B in his Geology class. His current test scores are 82,83, 90, and 77. His final exam is worth 4 test scores. In order to earn a Bâ€‹, Ralph's average must lie between 80 and 89 inclusive. What range of scores can Ralph receive on the ...

**Math**

A tourist traveled 10 km away from the city by bus, and then continued his journey by foot in the same direction at the speed of 5 km/h. At which distance y was he from the city in x hours of walking?

**Science**

When an electric current passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183 degrees Celsius and the other has a boiling point of -253 degrees Celsius. Has a physical or a chemical change occurred? Explain.

**English Literature**

In "The Call of the Wild", why did Buck end up in the Yukon Territory?

**Literature**

Jack London never actually set foot north of California a. true b. false *****

**Pre-algebra**

If a+b=c and b+c=d and c+d=e and a=7 and e=5, find a+b+c+d+e.

**art**

thx

**Social studies**

Where would you go to school if you lived in one of the parishes that were a long boat ride away from Savannah? My Answer: At a Mission

**Math**

A figure has vertices E(-3, 1), F(1, 1) and G(4, 5). After a transformation, the image of the figure has vertices at E'(-3, -1), F'(1, -1) and G'(4, -5). Identify the transformation. a) Reflection across the y-axis b) Reflection across the x-axis c) Rotation d) ...

**Algebra**

5 buckets contain a total of 100 tennis balls. How many balls are in each bucket if each bucket contains n more balls than the previous bucket? Find all the possible values for n.

**math**

mr tan and m town wong drove from town k to town h. they started their journeys at different times. mr tan drove at 66km/h and took 50 minutes to reach town h. mr wong drove an average spped of 75km/h.both arrived town h at 2.35pm. what is the distance from town k to town h? ...

**Chemistry**

Water molecules can dissociate into hydronium ions (H3O+ ,often just called H+ for shorthand) and hydroxide ions (OH-). The concentration of each of these ions in pure water is 10^-7. In other words, in pure water one out of every 10 million molecules is dissociated into a ...

**Chemistry **

The pH of a solution is 6.5 What are the [H+] and [OH-] of the solution?

**Chemistry**

What is the pH of a solution with a [OH-] of 10^-2

**Chemistry**

What is the pH of a solution with a [H+]=10^-8?

**Language Arts**

thx kiera

**algebra**

The inequality ?2(x + 10) ? 75 says the same thing as ?2x ? 20 ? 75. I can multiply by -2 on the left side without reversing the inequality symbol.

**English**

Can someone explain to me what does pre released title essay test mean,i dont get it and in my assessment shows that i have pre released title essay test.Please someone tell me what is it.Thanks

**Language Arts**

Which element is shared by both "Stolen Day" and "The Night the Bed Fell"? a)strong imaginations b)loving parental figures c)harsh family rules d)ill children

**English III A**

3. which of the following statements about early American and colonial literature is true? A) the literature primarily focuses on religious themes. B)the voices of women and minorities are absent from this period C) early American and colonial literature did not exist before ...

**Honors English III A**

2. Read the following Papago song. Identify its purpose. "No talking, no talking. The snow is falling. And the wind seems to be blowing backward. " A) to inform B) to persuade C) to analyze D) to express

**Science**

five types of microscopes in order from lowest resolution to highest

**math**

meredith wants to paint 3 of the walls in her room each wall has the shape of a rectangle with dimensions 10 feet by 12 feet she has 1 can of paint that will cover approixmately 420 square feet which method can meredith use to determine whether or not she has enough paint to ...

**Science**

Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strips and then put one strip each into test tubes: one containing water and one containing acid. Nothing happened when they added the magnesium to the ...

**Science**

if an atom has 17 electrons and its mass number is 35, calculate the following: number of protons, atomic number, and number of neutrons. i think there would be: an atomic number of 17, there would be 17 protons, and there would be 18 neutrons. am i correct???

**Language Arts**

The seashells were iridescent in the sunlight a. cloudy b. drying out c. breaking into pieces d. shimmering with colors I chose "d"

**Algebra**

Jaden discovers another prepaid phone plan (Plan B) that charges a flat fee of $15 per month, then $.05 per text sent or minute used. Write an equation for the cost of Plan B.

**Algebra 1**

Jaden discovers another prepaid phone plan (Plan B) that charges a flat fee of $15 per month, then $.05 per text sent or minute used. Write an equation for the cost of Plan B.

**Science**

thank you!

**Science**

1. An atom that loses or gains electrons is called a(n)____. isotope proton neutron ion*** 2.Which subatomic particles are most involved in chemical bonding? protons electrons*** neutrons isotopes 3.The main types of chemical bonds are___. ionic, covalent, and metallic*** ...

**Algebra**

For all real numbers a and b, 2a*b = a^2+b^2. True or false? If false, explain your reasoning. I'm pretty sure this is false, but I'm not sure how I would explain that?

**Algebra 1**

Jaden has a prepaid phone plan (Plan A) that charges 15 cents for each text sent and 10 cents per minute for calls. 1. If Jaden uses only text, write an equation for the cost C of sending t texts. a. How much will it cost Jaden to send 15 texts? Justify your answer. b. If ...

**Language Arts**

The author of "My Brother's Keeper", includes the line "and Jamie thought to himself, this time it must be bad" in Jamie's phone conversation with Ted in order to a. explain how Uncle Harry usually takes care of Ted. b. develop Ted as a character ...

**Art **

A work of art is considered prehistoric if it is:

**Math**

Your house is 1030 meters from school. Your friend's house is 1.5 Kilometers from school. Whose house is father from school?

**PE**

Which side of the health triangle corresponds to having loving relationships with others and giving and accepting help?

**Language arts**

The answer for the autobiographical narrative, sorry.

**Language arts**

I'm sorry what was the answer? I'm guessing it is B?

**calculus II **

A 100 gallon tank is being drained at a rate of 5 gallons per minute. A second tank containing 10 gallons of water is being filled at a rate of 4 gallons per minute. Can you find out when the two tanks will have the same amount of water in them?

**Englsih 10**

so the answers are right?

**Englsih 10**

are you sure these answers are correct

**science**

a hydrauli press has a ram of 30 cm diameter and plunger of 4.5cm diameter. find the the weight lifted by the hydraulic press when the force applied at the plunger is 500N

**Physics **

Let n represent the number of similar resistors in a circuit. Each resistor has a resistance of r. When the resistors are connected in parallel the circuit has a total resistance of R. What would the total resistance of the circuit be if the resistors were instead connected in...

**physics **

Two resistors of resistances 3 ohms and 6 ohms are connected in a parallel across a 9 V battery. What is the equivalent resistance and the total current in the circuit?

**Compare and Contrast**

Thank you Writeteacher.

**Compare and Contrast**

Hi, writeteacher.. I have read both books but Im still struggling with what they have in common and what they don't have in common. :(

**Compare and Contrast**

Hi! I need help with this assignment. I have 2 books to compare and contrast. Full Cicada Moon by Marilyn Hilton and Same But Different by Holly Robinson Peete, Ryan Elizabeth Peete, and RJ Peete. It seems like I don't have any differences and alikes in this 2 books. Can ...

**math 106**

Two balls are drawn in succession, without replacement, out of a box containing 2 red and 5 white balls. What is the probability that the first ball drawn is red and the second ball drawn is also red?

**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)

**math**

Glass A contains about 20% more than glass B

**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?.