If a fish swims 7/8 of the depth of 32 foot deep lake, how many feet down did the fish swim?

Ineed with number 17 i don’t get it at alll

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Consider the system: y = 3x + 5 y = ax + b what values for a and b make the system inconsistent? what values for a and b make the system consistent and dependent? explain