L= 4*B+42
L= the load
B is the weight of each brick
42 is the weight of the carrier
Answer:
The answer should be 1.625
Answer:
36 minutes
Step-by-step explanation:
time = distance / speed
time = (7.2×10² km)/((1.2×10³ km)/(60 min)) = (7.2×60/1.2)×10²⁻³ min
= 360×10⁻¹ min
= 36 min
It takes sound about 36 minutes to travel 720 km.
In terms of a fact family you could use the answer 6+9=15