The answer would be d , because you have to add how many of each fish to equal up to the sum of 420 . which is x y . so the first equation is x + y = 420 . then it says he bought 6 times as many parrotfish as he did angelfish so you would have to multiply x which represents angelfish by 6 . to get the second equation of y = 6x .
A^2b^5/c^5 because when you are multiplying exponents you add the powers
Answer:
420
Step-by-step explanation:
(12 x 7) x (1+4)
84 x 5
=420