Rewrite the question in an "equation way":
(some fish) = (man buys) + (boy buys) + (left)
(some fish) = 2 + 4 + 3
(some fish) = 9
Kelly saw 9 fish at first.
Answer:
4.
Step-by-step explanation:
(sec α - tan α)(sec α + tan α) = sec^2 α - tan^2α
But sec^2 α = 1 + tan^2 α so
sec^2 α - tan^2α = 1 + tan^2 α - tan^2α
= 1
so 1 = (sec α - tan α)(sec α + tan α) = 1/4 * x where x is sec α + tan α
1/4 * x = 1
x = 4.
The answer of the equation is 18.
