Could someone simplify these radicals for me?

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.