Answer:
20-30 seconds or 51
Step-by-step explanation:
Seven to the third power is
(7^3)
7 * 7 * 7
this is
49 * 7
which is
343
Hope this helps :)
Answer:

Step-by-step explanation:
Given

Required
Simplify
To solve this using distributive property, we simply open the bracket

This becomes


Hence;

Answer:
420
Step-by-step explanation:
find the area of the triangle at the top first
b*h/2
10.5*10/2 = 52.5
then times the area by the depth
52.5*8= 420mm