CPhill

Well....we can't swear to the "innocent" part....but here goes........

1.66242 x 10⁸ km²  .......there are  10,000,000,000cm^2  in 1 km^2  = 10^10 cm^2 in 1 km^2.......so

1.66242 x 10⁸ x 10¹⁰ = 1.66242 x 10¹⁸ cm^2

As for the second part, we have

 3.940 x 10³m  .......and there are 100 cm in 1 m  = 10² cm

So....

 3.940x 10³ x 10²   =   3.940 x 10⁵ cm

So....putting this all together, we have

1.66242 x 3.940 x 10¹⁸ x 10⁵  = 

654993480000000000000000 cm^3  =

About 6.6 x 10²³ cm^3

P.S. ......check my math, Melody......we Yanks don't deal well with metric units.....!!!

Shopping with an Engineer........!!!!

-4/3x + 2/5x = 14/45         get the common denominator of 45 on the left

(-60/45)x + (18/45)x  = 14/45       multiply through by 45

-60x  + 18x   =  14         combine like terms

-42x   =  14               divide by -42 on both sides

x  =  14 / -42   =  -1 / 3

There was nothing to "solve"......remember........we have to have an " = "  sign in the problem to do that......I just  "simplified"  it using some basic rules involving exponents.....

I don't know, zegroes......it's just a variable.......and, since it's upper-case, we usually assume that it's different from the lower-case "b"......What  is  each suppposed to represent?????.......who knows????

Just Basic Algebra, Z-Man........

 [B^2*b^3]  / (2b^2)^2  =

[ B^2*b^3 ] / [4 b^4]  =

[B^2 ]  / [ 4b ]

2(3x+17)=4        distribute the "2" across the terms in the arentheses on the left side

6x + 34  = 4        subtract 34 from both sides

6x  =  -30            divide both sides by 6

x = -5

OK.....post a specific question and we'll see what we can do......