Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Hi;

II 162. What is the area in square kilometers or square miles of the nation Democratic Republic of the Congo? (±5%)

II 163. What is the area in square kilometers or square miles of the nation Republic of the Sudan? (±5%)

Hi;

The solution #6193 (two values) is correct. Good work, bobbym!

#6194. The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find the two numbers.

Hi;

The Answer #6630 is correct. Neat work, bobbym!

#6631. Name the three elements starting the letter 'E'.

#6632. Name the four elements starting with the letter 'G'.

Hi;

Good attempt, bobbym! (II 158)

II 160. What is the density of Bromine in kilograms per meter cube? (room temperature)

II 161. What is the density of Diethyl ether in grams per cubic centimeters or kilograms per meter cube?

Hi;

The solution #6192 (two values) is correct. Good work, bobbym!

#6193. The sum of the squares of two consecutive multiples of 7 is 637. Find the multiples.

Hi;

The solution #3769 is correct. Good work, bobbym!

#3770. Find the value of k for which the following system of equations has a unique solution:

4x - 5y = k,

2x - 3y = 12.

Hi;

Both the Answers,

and , are correct. Excellent, bobbym!#6629. What is the chemical name of 'red lead'?

#6630. What is the chemical name of 'Sal ammoniac'?

Hi;

.

.

II 158. What is the density of concrete in kilograms per meter cube?

II 159. What is the density of cotton in kilograms per meter cube?

Hi;

The solution #3769 is correct. Keep it up, bobbym!

#3770. Find the value of k for which the following system of equations has a unique solution:

4x + ky + 8 = 0,

2x + 2y + 2 = 0.

Hi;

The solution #6191 (two values) is correct. Neat work, bobbym and Monox D. I-Fly!

#6192. Two numbers differ by 3 and their product is 504. Find the numbers.

Hi;

The Solids of Revolution by Disks and Washer Method are presented in a neat manner.

The presentation is absorbing.

Hi;

II 156. What are the dimensions of Angular Momentum?

II 157. What are the dimensions of Energy or Work?

Hi;

The Answer #6626 is correct. Excellent, bobbym!

#6627. Name the only World Heritage City in the United States.

Clue : It is the birthplace of the United States Marine Corps, and is also the home of many U.S. firsts, including the first library (1731), first hospital (1751) and medical school (1765), first Capital (1777), first stock exchange (1790), first zoo (1874), and first business school (1881).

#6628. Name the historic nickname for Toronto, Ontario.

Hi;

The solution #3768 (two parts) is correct. Keep it up, bobbym!

#3769. Find the value of k for which the following system of equations has a unique solution:

kx + 2y = 5,

3x + y = 1.

Hi;

The solution #6189 is correct. Neat work, bobbym!

#6190. Two numbers differ by 4 and their product is 192. Find the numbers.

Hi;

#6625. What is 'allodoxaphobia'?

#6626. What is 'catagelophobia' or 'katagelophobia'?

Hi;

.

.

Both the Answers, II 152 and II 153, are correct. Excellent, bobbym!

II 154. What is a Short ton?

II 155. The standard atmosphere (symbol: atm) is a unit of pressure. What is its value in Pascals?

Hi;

The solution #6188 is correct. Neat work, bobbym!

#6189. Find the value of k for which the given quadratic equation has real and distinct roots:

Hi;

The solution #3767 is correct. Neat work, bobbym!

#3768. In each of the following system of equations determine whether the system has a unique solution, no solution or infinitely many solutions.

In case there is a unique solution, find it:

(i) 2x + y = 5,

4x + 2y = 10.

(ii) x - 2y = 8,

5x - 10y = 10.

Hi;

The solution #6187 (two values) is correct. Neat work, bobbym!

#6188. Find the values of k for which the roots are real and equal in each of the following equation:

kx(x - 2) + 6 = 0.

Hi;

The solution set in #3766 is perfect. Excellent, bobbym!

In each of the following system of equations determine whether the system has a unique solution, no solution or infinitely many solutions.

In case there is a unique solution, find it:

x - 3y = 3,

3x - 9y = 2.

Hi;

II 152. How many square meters is an Acre?

II 153. How many Ounces is a Kilogram?

Hi;

The Answer #6621 is correct. Neat work, bobbym!

#6623. What is 'Kritarchy'?

#6624. What is 'ptochocracy'?

Hi;

The Answers, #6619 and #6620, are correct. Excellent, bobbym!

#6621. Name the English physicist, and Nobel Prize in Physics laureate (5 December 1903 - 9 August 1969) for his development of the photographic method of studying nuclear processes and for the resulting discovery of the pion (pi-meson), a subatomic particle.

#6622. Name an an elementary particle similar to the electron, with an electric charge of -1 e and a spin of 1/2, but with a much greater mass. It is classified as a lepton. As is the case with other leptons, it is not believed to have any sub-structure - that is, it is not thought to be composed of any simpler particles.

Hi;

The solution #3765 (two parts) is correct. Neat work, bobbym!

#3766. Determine the values of m and n so that the following system of linear equations have infinite number of solutions:

(2m - 1)x + 3y - 5 = 0,

3x + (n - 1)y - 2 = 0.