Please please please help quick

Step-by-step explanation:

Since the triangle has a right angle, we are going to use pythaogoran theoem, which is , where a and b are the legs and and c is the hypotunese/ slated side.  Let set it up.

9+36=c^2

45=c^2

=

Then we are going to find a perfect squarre root(1,4,9,16,25....) to simplify the radical

The perfect square root is 9 because 9 goes into 45 5 times.

Then take the sqr root of 9 and we have

3.76 * 10^4

Step-by-step explanation:

He had 4.6 * 10^4 - 8.4 * 10^3

= (460 - 84) * 10^2

= 376*10^2

= 3.76 *10^4   answer