CPhill

Hit the "2nd" button  and then the "atan" button  (for the arctangent)

Wow!!!...that's one of the most impressive looking displays I've seen on here....you should register and become an identifiable participant!!!.......

2 * log 144 =

2 * 2.158 =

4.136

8-(4n-3)=7-5n       simplify

8-4n+3 = 7 - 5n

11 - 4n = 7 - 5n   add 5n to both sides  and subtract 11 from both sides

n = -4

That's great, reinout-g !!!!!

Thanks, D.S.......

So

x² + y² = 256  

And

(x + y )² = x² + 2xy + y² =  784

So

x² + 2xy + y² =  784

And

x² + y² = 256

And subtracting the second equation from the first, we have

2xy = 528     and dividing by 2 on both sides, we have

xy = 264   ....and that's the product of the two numbers

I don't know what's causing that, rosala.....I actually find Firefox to be pretty good....it's my browser of choice.......I never seem to have many "crashes" with it, and the images always seem to load....there are also numerous add-ons and extensions available with Firefox.....I particulalry like one - Ad Block Edge....it blocks all ads from appearing (even on Youtube)....you might stick with it a while.....maybe you will learn to like it ( )

It's a joke, rosala......[it's a pun on the imaginary number "i" ]

Room 1     9 feet by 14 feet  =  126
Room 2   12 feet by 15 feet  =  180
Room 3   15 feet by 15 feet  =  225

Total = 531 sq ft.