2x< 8= ? also, can you explain to  me how i can solve these kinds of problems?

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

What is the correct decimal form of 12%

Find the values of the variables and the lengths of the sides of this kite.