# Posts by chica

Total # Posts: 32

**Chemistry**

Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5860 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 ...

*September 29, 2013*

**chemistry**

1.16e15

*April 26, 2013*

**math**

Well write it out, let 1 represent 10:00 in the x coordinant's position, and let y be the miles out on the course the ship is. Ship 1 10:00 11:00 12:00 1:00 2:00 (1,10);(2,20);(3,30);(4,40);(5,50); 3:00 4:00 5:00 6:00 7:00 (6,60);(7,70);(8,80);(9,90);(10,100) Ship 2 1:00 2...

*May 19, 2011*

**algebra**

1. If s is between two numbers, then it is less than one number and greater than another. Logic leeds us to conclude that the smaller number between the two given would be the one s is greater than and the other larger number would be the one s is less than. Therefore: 70<s...

*May 19, 2011*

**algebra**

The number of people in the chess club - x is less than or equal to 12 - less than sign above 1/2 equal sign x¡Ü12

*May 19, 2011*

**algebra**

A number - x is - = at least 15 - so it can be greater than 15, but also it could be equal x¡Ý15

*May 19, 2011*

**Geometry**

A plane intersects a sphere that has a radius of 13cm. The distance from the center of the sphere to the closest point on the plane is 5 cm. What is the radius of the circle that is the intersection of the sphere and the plane? A. 8cm B. 10cm C. 12cm D. 13cm Could please shed ...

*May 19, 2011*

**Geometry/Trig.**

Let angle A be and acute angle in a right triangle. Approximate the measure of andgle A to the nearest tenth of a degree. cos A = 0.11

*January 30, 2011*

**Geometry/Trig.**

For acute angle Aof a right triangle, find tan A by using the 45-45-90 Triangle Theorem or the 30-60-90 Triangle Theorem. measure of angle A=45 degrees.

*January 30, 2011*

**Geometry**

How can I find the legs of a right triangle using only the hypotenuse length, 600, and the fact that all the sides have to add up to 1400?

*January 18, 2011*

**Geometry**

Rectangles The ratio of the length to the width of one rectangle is proportional to the ratio of the length to the width of a smaller rectangle. Describe the circumstances for which this proportion involves a geometric mean.

*November 29, 2010*

**Geometry**

The three coordinate points are collinear. Use slopes to write aproportion to find the value of a. #38. (-4,1),(-1,2),(5,a) #39. (4,5),(1,2),(a,0)

*November 29, 2010*

**algebra 2**

-12<4z<=2 -3<z<=.5 Possibly... I'm not totally sure but it is a guess.

*November 29, 2010*

**algebra**

-9x-6y=-66 Multiplied top equ. by -3 9x-8y=-4 Cancel x's -14y=-70 y=5 Then plug in the y to find the x in an equation. Be sure to check by plugging both in after.

*November 29, 2010*

**geometry**

40-gon? Possibly... I am consulting my sources at the moment. Do you know if all of a polygon's angles have to measure 360 degrees?

*November 29, 2010*

**algebra**

r<=-13

*November 29, 2010*

**Geometry-EXtended Exponents**

Use the given ratio and information in the figure to find the value of the variable(s). XY:YZ:XZ=7:10:14 XY=b-7 These are side lengths YZ=b+20 to a triangle. Side XZ=5c-24 note XZ is the hypotenus

*November 29, 2010*

**Geometry**

Complete the indirect proof. Given: Rectangle JKLM has an area of 36 square centimeters. Side JK is at least 4 centimeters long. Prove: KL<=9 centimeters

*November 18, 2010*

**Geometry**

Write an indirect proof that an obtuse triangle does not have a right angle. Given: Triangle RST is an obtuse triangle. Prove: Triangle RST does not have a right angle. Let angle S be an obtuse angle. Assume Triangle RST has a right angle. Let angle R be a right angle. Use ...

*November 18, 2010*

**algebra**

If you are combining like terms, you get 7a^2+8a.

*November 18, 2010*

**Geometry**

Indirect Proofs Prove a triangle cannot have 2 right angles. 1) Given triangle ABC. 2) Assume angle A and angle B are both right angles is true by one of two possibilities (it is either true or false, so we assume it is true) This is my first time to do indirect proofs, so if ...

*November 18, 2010*

**ALgebra**

(x-3)(x-3)= (x^2-6x+9) (x^2-6x+9)(x-3)= x^3-6x^2+9x-3x^2+18x-27 Add Like Terms x^3-9x^2+27x-27 The same idea for the others.

*November 18, 2010*

**math**

-9 is less than -6 2 is greater than -8 0 is greater than -2

*November 3, 2010*

**Algebra-Quadratic Applications**

A diver on a platform 40 feet in height jumps upward with an initial velocity of 5 feet per sec. His height in h feet after t seconds is given by the function h=-16t^2+5t+50. What is his maximum height? How long will it take him to reach the surface of the water?

*May 13, 2010*

**Algerba**

4x+10=22 -10-10 4x=12 /4 /4 x=3

*May 13, 2010*

**algebra**

Find the length of a side of an equilateral triangle with altitude of length 6.

*March 2, 2010*

**aglebra**

Soybean meal is 14% protein; cornmeal is 7% protein. How many pounds of each should be mixed together i order to get 280-lb mixture that is 8% potein?

*January 26, 2010*

**math algebra**

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 miles per hour and train B is travleing at 100 miles per hour. Train A pases a station at 3:20. If train B passes the same station at 3:35 pm, at what time will train B cathc up ...

*January 26, 2010*

**algebra**

amy paid 55.42 for a pair of running shoes during a 15%-off sale. What was the regular price?

*January 26, 2010*

**algebra 1**

Solve each linear system by substitution method. x+2y=7 2x+4y=8 I'm getting stuck. Could some one explain the work out process and what the outcome means?

*January 24, 2010*

**algebra**

During the playoffs you score 2 goals per game. By the end of the second playoff game you had scored 22 goals for the year. Find an equation that gives the total number of goals scored for the year, y, in terms of the number of playoff games, x.

*November 18, 2009*

**algebra**

By the end of your 5th French lesson, you have learned 20 vocabulary words. After 10 lessons you know 40 vocabulary words. Write an equation that gives the number of vocabulary words you know, y, in the terms of the number of lessons you had, x.

*November 18, 2009*

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