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Answers by Sean O.

First you find the molar mass of each atom in your periodic table: Beryllium has 9.01 g/mol and Chlorine has 34.45 g/mol. Since the molecule is BeCl2, you have to add the molar masses of 1 BE + 2 Cl, which makes 9.01g/mol + 2(34.45g/mol) = 77.91g/mol. Since you have 2.5 mol of...

Find the speed of the boat by dividing 60 km by 8 hours, which is 7.5 km/hr. Since during all this time the river was working against the boat with a speed of 4 km/hr. You add that together to make 11.5 km/hr, that is the speed the boat would have to be able to go in still water.

Divide the perimeter by two to get exactly one length and one width (because a perimeter has two of each), which is 220. Since the ratio is 7:4, you add 7+4 which equals 11. Divide 220 by 11, which gives you 20. The length is 20 times 7 (=140) and the width is 20 times 4 (= 80).   Check...

Add the radius, the wall thickness, and the thickness of the insulation:   10.6 cm + 2.575 cm + 4.4 cm = 17.575 cm   The diameter is twice the radius, therefore double the number: 2 x 17.575 = 35.15 cm   Now round it because you can only have one...

What the trains have in common is the time it takes them to meet, which is for both the same time. When train B leaves, train A is already gone for 8 hours and has covered a distance of 8h x 80km/h, which is 640 km.   After that it takes them the same amount of time (t) to meet...

Do you have a specific question about a math problem? Remember, on the other end of the computer is a teacher.  :-)

Equation answer (answer)

You can set up the problem with the following equation (x means "times"): 85 x ($12 - $5) - $230 = ? You multiply your profit for each pizza, which is $12 cost of pizza minus $5 to make it, with 85 times, the number of pizzas you make. You subtract form all this the fixed...

This problem is about circular motion. The formulas for circular motion are as follows: F(c) = m x a(c)   and a(c) = v(square) / r    therefore F(c) = m x v(squre) / r Centripetal force = F(c), centripetal acceleration = a(c), m=mass, v=velocity, r=radius You...