It’s solved by using the cosine rule
<span>associative property of addition and answer is
</span><span>(u + 7) + 13 = u + (7 + 13)</span>
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Add sides 5
Subtract sides 2x
Divide sides by 4
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CHECK :
Thus the solution is correct....
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Answer:
We use cosine rule also called cosine law which states
c^2=a^2+b^2-2abcosC
given
a=8cm, b=7cm, c=9cm cos C?
9^2=8^+7^2-2*8*7 cos C
expand
81=64+49-112 cos C
like terms together
81-113=-112 cos C
-32=-112cos C
multiply both sides by -1
32=112cos C
divide both sides by 112
32/112=cos C
cosC=0.2857
find cos inverse of 0.2857
angle C= 73.40
Answer:
3people/minute
Step-by-step explanation:
75/25=3