# sam

Newest questions posted by sam-
## Math

At the Bay of Fundy, the difference between high and low tide is 8m and the time between high tides is 12 hours. At midnight, the water is at high tide. Write a sine function that models the water level over time t. -
## Algebra

The members of set A are the integer solutions of the inequality 2x−5≤11 and the members of set B are the integer solutions of the inequality −2x+7≤−9. What is one member of the intersection of A and B? -
## Physics - Compton Scattering

X rays of wavelength 0.0166 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 169°, what are (a) the Compton shift, (b) the -
## Science

1. The air temperature is 10°C and the air contains 2.87 grams of water vapor. What is the relative humidity? Saturation mixing ratio of air parcel at 10°C is 7g/kg 2.87 / 7 x 100% = 41% 2. If the temperature of the air parcel in question 11 drops 10°C, -
## Science

As the air cools below the dew point temperature, the excess water left the air parcel via (condensation, evaporation). Is the answer condensation? -
## science

The compound adrenaline contains 56.79% C, 6.56%H, 8.28% N, and 28.37% O by mass. Assuming 100 g of adrenaline, how many moles of carbon are present? -
## Maths need help asap

How can I factor these [2a³c-2a³b+2ab³-2b³c+2bc³-2ac³] -
## math

The sum of 16 and Janelle's age is 53 -
## mathematics

if f(x) = 16^x/(16^x + 4) find f(1/2017) + f(2/2017) +f(3/2017) + ...+ f(2016/2017) -
## us history

In response to which acts did colonial opposition become violent? stamp act sugar act townshend act tea act -
## Renaissance and Protestant Reformation

Could somebody please tell me at least 15 noteworthy events from the Renaissance and the protestant Reformation or maybe good links that I could look at? -Sam -
## physics

A tennis ball attached to the end of a light string hangs inside a car traveling on a circular track at 4.7 m/s. What is the radius of the circular track if the string makes a 10° angle with the vertical direction? -
## Physics

Just before a bouncy ball hits a wall, it is traveling parallel to the ground at 18 m/s, and it then bounces directly backwards at 17 m/s. The interaction time with the wall was 0.40 ms (4.0 x 10-4 s). If the ball's mass is 0.17 kg, what is the average -
## Geography

If the time at 10degree East is 11pm.what is the time in85degree West -
## Science

After an accident, a 60.0 kg Inuit girl finds herself at rest on the frictionless ice of a frozen lake, 15.0 m north of her stationary 150 kg sled. Fortunately she is connected to the sled by a rope of negligible mass, so she begins hauling the rope in, -
## science

Please someone answer this question for me .If you want to work in the lab what were you trying to demonstrate............... Thanks -
## Physics

Moving a magnet back and forth inside a coil of wire induces a current. How does the speed of the motion affect the magnitude of the current? Can someone please help me with this?? It would be much appreciate!! (= -
## Math

There are 10 egg sandwiches, 6 chicken sandwiches and 4 tuna sandwiches on a tray . A sandwich is randomly chosen. Find the probability an egg sandwich is chosen . -
## math

Two teams of workers were scheduled to produce 680 parts in a month. The first team produced 20% more parts than planned and the second team produced 15% more than planned. The two teams together produced 118 parts more than planned. How many parts was -
## Physics

Calculate how much energy is stored in a 17μF capacitor when it is charged to a potential difference of 200 V -
## Biology

How might large animals living in a group deal with a food shortage? A) by reproducing B) by shedding C) by migrating D) by fasting*** Pls help! Thank you! (= -
## Science

The molecular formula of first member of a certain group of organic compounds is CH2O(HCHO).Determine the name & molecular formula of third member of this group if it is in homologous series. What is the general name for this group of organic compounds? -
## Science

Al2O3 + 2NaOH = 2NaAlO2 +H2O What is the conclusion that you take about nature of aluminum oxide with help of equation.Give reasons for conclusions? -
## Math

If the length of a rectangle is decreased by 4 cm and the width is increased by 5 cm, the result will be a square, the area of which will be 40 cm2 greater than the area of the rectangle. Find the area of the rectangle. -
## math 11

If a truck travels at 120km to a warehouse with an empty truck. On the return trip, with a full truck, the truck driver travels 20 km slower. If the entire trip took 3.5 hours then determine his speed to the warehouse. IF the rate is 120 when leaving and -
## math 11

How much alfalfa should be added to 60L of ostrich pellets to create a mix that is 32% alfalfa by volume? I have no idea how to start this question. If I let x be the alfalfa and x+60 = 32 be the mix -
## Chemistry

If 102.6 g of K2SO3 are dissolved into 3.1 L of solution calculate the molar concentration PLEASE! help and and show the steps !! I’m trying to understand the process! -
## Math

The slope of a line passing through H (-2, 5) is -3/4. Which ordered pair represents a point on this line? a. (6, -1) b. (2, 8) c. (-5, 1) d. (1, 1) I think it's C. And it is NOT B by the way. -
## Maths

Experiments show that the concentration of substance X in a ﬁrst order chemical reaction at future time (in seconds) t i.e. [X] is described by the following diﬀerential equation: d[X]/ dt= .001[X], ﬁnd: (a) Find an expression for the concentration -
## algebra

It cost Mr. Andrews 200,000 dollars to build a house. He sold it to Ms. Bond at a 10 percent profit. Later Ms. Bond sold it to Mr. Cash at a 10 percent loss. What is the positive difference between the amount Ms. Bond bought the house for and the amount -
## Math

Becky and James have a total of 4 2\8 feet of yarn.Becky has 1 5\8 feet of yarn.how many feet of yarn does James have? -
## Math

A bag contains equal numbers of red, blue, and yellow marbles. A student chooses a marble at random. What is the relationship between the probability that the marble is red and the probability that the marble is not red? A) P(red) = P(not red) B) P(red) = -
## math

Find an equation for a line that contains (4, 9) and is perpendicular to the graph of y = 7x + 3/8 Answer choices 1. y = -1/7 x + 9 4/7 2. y = 7x - 15 3. y = 1/7x + 8 5/7 -
## English

1. The best way to improve listening comprehension is to a. take informal notes on what you hear. b. use complete sentences to take detailed notes of both main ideas and details. c. concentrate on listening to the speaker's transitions. (B) 2. -
## Math

Replace ∗ with a monomial so that the trinomial may be represented by a square of a binomial: 36–12x + ∗, and 25a^2+ ∗ + .25 b^2 -
## Math

Find the maximum value of the objective function z = 19x + 7y, subject to the following constraints. (See Example 2.) 3x + 2y â‰¤ 18 6x + 2y â‰¤ 30 â€‰ x â‰¥ 0, y â‰¥ 0 -
## Finite Mathematics

Find the maximum and minimum value of the objective function given. z = 21x + 12y maximum value z = minimum value z = -
## aglebra 1

Use the following sequence of numbers to answer the questions that follow. 320, 80, 20, 5, …… Write the explicit equation for the given sequence. Answer choices 1. t(n+1) = t(n) * 0.25 2. t(n) = 320 * 0.25n 3. t(n) = 1280 * 0.25n -
## math

use the formula v=lwh to find the volume of a rectangular prism with the following dimensions: • length = 7 in. • width = 4 in. • length = 3 in. a. v = 14 in.3 b. v = 31 in.3 c. v = 49 in.3 d. v = 84 in.3 -
## math

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets? -
## Math

200 cans of food were distributed to 3 charity homes. 2/5 of the cans were given to the first home, 1/3 of the remainder to the second home and the rest to the third home. How many cans did the third home receive? -
## Spanish

in which of the following ways is the National Museum Fair in Costa Rica similar to International Museum Day in the United States? -
## Chemistry

Determine the molar concentration of ethanol (C2H6O) in a wine that is 14% ethanol by mass. The density of this wine is 0.93 g/cm^3. -
## Chemistry

Determine the molar concentration of ethanol (C2H6O) in a wine that is 14% ethanol by mass. The density of this wine is 0.93 g/cm^3. -
## physics

a piece of clay with a mass of 0.30 kg is tied to the end of a string 6.5 meters in length, and then whirled around in a horizontal circle at a speed of 6 m/s. a. what is the centripetal acceleration of the clay? b. what is the tension of the string? -
## Math

Daisy saved 4/5 of her salary. She gave 1/3 of the money she had saved to her mother. If she gave $300 to her mother, what was her salary? -
## Englsih

Hey, can someone help me come up with examples for Aphorism speech plzzzz I came up with 3 I need 4 more!? "It is better to remain silent and be thought a fool than to speak out and remove all doubt" Here is the quote I am working on and it would be nice -
## Algebra

Find four consecutive natural numbers if you know that the product of the first two is 38 less than the product of the following two numbers. -
## Science

Give some examples of artifacts that are used to determine the geological history of the Earth, as well as how its life forms have changed over time. Is the question given and I don't really know any artifacts that are used for the geological history of -
## math

Judy spent 1/6 of her money on a pair of shoes and 2/5 of it on a bag. She then had $26 left. a) What Fraction of her money did she have left? b) How much money did she have at first? -
## Calculus

Find the derivative of [(2+x)/(x-3)]^(2/5) I tried the power of a function rule, quotient rule, the chain rule but keep getting stuck. -
## math

You are making costumes for the school play. Each costume needs a piece of ribbon that is 5858 yard long. How many yards of ribbon are needed for the 2424 costumes? -
## Math

Lindsey read 2/5 of a book on Monday. She read 12 pages on Tuesday. If she still had 1/2 of the book to read, how many pages were therein the book? -
## Maths

A map has A scale of 1.25000.two towns are 15cm apart on the map.how far apart in real life ? answer in metres ? -
## Math

In order to compare to function to determine which has the greater output for the input 0, which characteristic of the function should be compared? a) rate of exchange b) slope c) x-intercept d) y-intercept is it the y-intercept? -
## Chemistry

What is the boiling point (in °C) of a solution of 9.22 g of I2 in 66.5 g of toluene, assuming the I2 is nonvolatile? (For toluene, Tb = 110.63°C and Kb = 3.40°C·kg/mol.) -
## math

In a shop, There are 25 bicycles and tricycles. There are 63 wheels in all. Find the number of bicycles in the shop. -
## Algebra Assignment

An apple pie uses 4 cups of apples and 3 cups of flour. An apple cobbler uses 2 cups of apples and 3 cups of flour. You have 16 cups of apples and 15 cups of flour. When you sell these at the Farmer’s Market you make $3.00 profit per apple pie and $2.00 -
## MATH

Terry has completed 15 homework problems, and Susan has completed 9. Terry is completing 10 problems per hour, and Susan is completing 12 per hour. After how many hours will Terry and Susan have completed the same number of problems? a. 3 hrs**** b. 4 hrs -
## math 10

a British researcher developed a formula to determine walking or running speed based on hip height and stride length. The formula is s= 0.78l ^1.67/ h^1.17 where s is speed in meters per second l is stride length in meters, and hi is the individual hip -
## Physics

A home run is hit such a way that the baseball just clears a wall 26 m high located 114 m from home plate. The ball is hit at an angle of 35â—¦ to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 2 m above the -
## Physics

A particle travels between two parallel ver- tical walls separated by 12 m. It moves to- ward the opposing wall at a constant rate of 5.4 m/s. It hits the opposite wall at the sam a) What will be its speed when it hits the opposing wall? b) At what angle -
## Algebra I

For the following system of equations, what is the x value of the solution? -x + 2y =6 6y = x + 18 -
## Algebra I

Write an equation in point-slope form for the line through the given point with the given slope. (-3,-5); m=-2/5 -
## Algebra I

Write an equation in point-slope form for the line through the given point with the given slope. (-3,-5); m=-2/5 -
## math

A girl starts to walk to her school, which is 20 miles away, at 6:50 and at a rate of 3 miles per hour. After a while, her dad picks her up and drives her through the remainder of the way at 30 miles per hour. If they arrived at school at 9:00, how far did -
## 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 -
## 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 -
## 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 -
## 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 -
## 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 -
## 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 -
## 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 -
## 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 -
## 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 -
## 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% -
## 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 -
## 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