Karen earns $20 per hour and already has $400 saved, and wants to save $1200. How many hours until b

[math_celebrity]

Karen earns $20 per hour and already has $400 saved, and wants to save $1200. How many hours until bob gets his $1200 goal?

Set up he savings function S(h) where h is the number of hours needed:
S(h) = savings per hour * h + current savings amount
S(h) = 20h + 400

The question asks for h when S(h) = 1200:
20h + 400 = 1200

To solve for h, we type this equation into our search engine and we get:
h = 40