Dexter had 15 fish in his fish tank. 7 were
goldfish. the rest were neon tetra fish.
then he added 4 neon tetra fish.
how many neon tetra fish are in the tank now?
.
? neon tetra fish
v done

12

Step-by-step explanation: so sart by subtracting 15 and 7

15-7

this gives you 8

now add 4

8+4

this gives you 12

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

c. side angle side. u shares the same sides