10/09/20

the sum of two numbers is 19 and their difference is 9 what is the answer
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10/09/20

Plot the following data points and determine the equation
Using a spreadsheet software, plot the following data points and determine the equation for the line of the calibration curve. Concentration... more
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10/09/20

Algebra II: Chemical Compounds
it would really help me if I knew the process to get the answer step by step.A beaker oh PH3 contains 372 grams of hydrogen. What is the total weight in the beaker? (P:31, H:1)
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10/09/20

2HNO3(aq)+Ba(OH)2(aq)⟶2H2O(l)+Ba(NO3)2(aq).A 0.115 L sample of an unknown HNO3 solution required 31.7 mL of 0.200 M Ba(OH)2 for complete neutralization. What is the concentration of the HNO3 solution?
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10/09/20

Pb(NO3)2(aq)+2NH4I(aq)⟶PbI2(s)+2NH4NO3(aq) What volume of a 0.530 M NH4I solution is required to react with 929 mL of a 0.200 M Pb(NO3)2 solution?How many moles of PbI2 are formed from this reaction?
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10/09/20

Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 5.50 M HCl(aq) are required to react with 7.35 g Zn(s)?
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10/09/20

If 5.88 g of CuNO3 is dissolved in water to make a 0.100 M solution, what is the volume of the solution in milliliters?
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10/09/20

Started with 3.70 mL acetic anhydride (density=1.08 g/mL) and 1.65 g salicylic acid.The student synthesized 1.81 g of aspirin. FInd theoretical and percent yield for aspirin
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10/09/20

Problem Set 3: Rates and Conversion
4. Jamie made 7 paper airplanes in 2 minutes. She wants to make 10 paper airplanes. If Jamie works at the same rate, which of the following proportions can be used to determine x, the number of... more
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10/09/20

Problem Set 3: Rates and Conversion
The math book is 6 inches wide. How many centimeters wide is it? (1 inch = 2.54 cm) A. 15.24 cm B. 12.70 cm C. 8.54 cm D. 3.46 cm
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10/08/20

Application Problem
A carpenter purchased 60 ft of redwood and 90 ft of pine for a total cost of $303. A second purchase, at the same prices, included 90 ft of redwood and 60 ft of pine for a total cost of $357. Find... more
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10/08/20

Boyle law lab question
If you add 1.000atm of butane and what would the volume be at 2.350atm pressure and what would the pressure be at 120ml of water (adding water with each pressure increase)
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10/08/20

Starting from 150 ft​ away, your friend skates toward you
Starting from 150 ft​ away, your friend skates toward you and then passes you. She skates at a constant speed of 20​ft/s. Her distance d from you in feet after t seconds is given by d=|150-20t|.... more
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10/07/20

HOW do collisions between molecules transfer energy from a system of reacting substances to its surroundings?
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10/07/20

The length of a rectangle is 5 cm less than three times its width. If the perimeter of the rectangle is 54 cm, find the LENGTH of the rectangle.
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10/07/20

The Quick Meals Diner served 411 dinners. A child's plate cost $3.20 and an adult's plate cost $6.60. A total of $2,005.40 was collected. How many of each type of plate was served?
The Quick Meals Diner served 411 dinners. A child's plate cost $3.20 and an adult's plate cost $6.60. A total of $2,005.40 was collected. How many of each type of plate was served?Round answers to... more
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10/07/20

The 'I will Fleece you' Company, LLC sold 24 neck warmers. Tiger fleece neck warmers sold for $10.65 each and fluffy wool ones sold for $9.25 each. In all, $237.40 was taken in for the neck warmers.

The 'I will Fleece you' Company, LLC sold 24 neck warmers. Tiger fleece neck warmers sold for $10.65 each and fluffy wool ones sold for $9.25 each. In all, $237.40 was taken in for the neck... more
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10/07/20

Calculate the mass
Calculate the mass of water needed to combine with the starch peanut to make a 1.5% w/w starch solution
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10/07/20

m(x)=4r+15;m(x)=7
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10/07/20

Profit when producing 50 items and 60 items?
For a certain company, the cost function for producing x items is c(x)=40x+150 and the revenue function for selling x items is r(x)=-0.5(x+90)²+4050. The max capacity of the company is 110 items.
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10/06/20

CHEMISTRY HOMEWORK
In a constant‑pressure calorimeter, 60.0 mL of 0.340 M Ba(OH)2 was added to 60.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.66 ∘C to 27.29 ∘C.... more
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10/06/20

On Ryan’s last math test, there were two types of questions: multiple choice questions worth 4 point
On Ryan’s last math test, there were two types of questions: multiple choice questions worth 4 points each and true/false questions worth two points each. If Ryan earned 86 points on the test and... more
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10/06/20

The perimeter of a triangle is 81 cm if two sides are equally long and the third side is 6 cm longer than the others find the lengths of the three sides
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10/06/20

By how much will the temperature of the calorimeter increase if the combustion of a certain sample of cyclohexane releases 9892 J of heat?
The heat capacity of a bomb calorimeter is .By how much will the temperature of the calorimeter increase if the combustion of a certain sample of cyclohexane releases 9892 J of heat?
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10/06/20

In 2003, the population of an African country was about 22.5 million people, which is 3 million more than 5 times the population in 1950.

please help me 
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