Ineed answer this. question 4.05 × 12

This is pure multiplication.

4.05 x 12 = 48.6

You can prove this by getting 5% of 12, and adding it to 12 x 4.

4.05 x 12 = 48.6

Explanation,

Simply Multiply 4.05 x 12 and you will get 48.6. If you would like to check your work divide, 48.6/4.05 and you will get 12.

Hope this helps :-)

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk