The law of cosines states that, if 
is the angle between sides b and c,
So, plugging our values, we have
This is equal to
Answer: 7/24
Step-by-step explanation:
Fraction of the items barbecued that are veggie burgers = 3/8
Fraction of the items barbecued that are corn cobs = 1/3
The fraction of the items barbecued that are mushrooms caps will be:
= 1 - (3/8 + 1/3)
The lowest common multiple of 8 and 3 is 24.
= 1 - (3/8 + 1/3)
= 1 - [(3/8 × 24) + [(1/3 × 24)]
= 1 - (9/24 + 8/24)
= 1 - 17/24
= 7/24
Total miles:350+150=500
Total hours:4+3=7
Avg speed:500/7=71.429 mph
Community property of addition because -6 + 6 would equal zero
