10 x 25 = 250, well 20 x 25 is just double that, its 10 doubled x 25 so he probably just added it up. repeated addition really helps with times tables.
Answer:3/4 inch
Step-by-step explanation:
Answer:
slope = - 
Step-by-step explanation:
The equation of a line in point- slope form is
y - b = m(x - a)
where m is the slope and (a, b) a point on the line
y - 3 = - (x - 2) ← is in point- slope form
with slope m = -
0.771 BTU/cubic ft
Step-by-step explanation:
Volume = 120*35*20 = 84,000cubic ft
Total BTU's = 2,400* 27 = 64,800BTU
64,800 BTU / 84,000 cu ft = 0.771 BTU/cubic ft
