Question

1. (3.0 X 10^2) x (2.0 X 10^6)
I said 6 X 10^8

2. what is the area of a square with the dimension of 1+ ã 2?
I don't know this one

3. Simplify: 2ã 4 + 2ã 8.
I said 10

4. Simplify: 2ã 4 + ã 4
I said 6

5. 5ã 4 x ã 8
----------------
ã 8 X ã 2
I said 10.

6. ã y= 5 + ã 2
-------------
2
I said y= 2.5

Are these right?

Answer 1

I will assume you intended your
ã to come out as √

1. is correct, I would write it as
6.0 x 10^19

2. area = (1 + √2)^2
=1 + 2√2 + 2 = 3 + 2√2

3. 2√4 + 2√8
= 2(2) = 2(2√2)
= 4 + 4√2

4. correct

5.
(5√4)(√8)/(√8(√2)
= 5√40/√16
= 5(2√10)/4
= 5√10/2

√y = 5+√2
square both sides
y = (5+√2)^2 = 25 + 10√2 + 2 = 27 + 10√2