Calculate the total surface area of the pyramid ​

Need same math paper but the back now i hope your able to read it cleary i need with hw

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

Katie wants to collect over 100 seashells. she already has 34 seashells in her collection. each day, she finds 12 more seashells on the beach. katie can use fractions of days to find seashells. write an inequality to determine the number of days, dd, it will take katie to collect over 100 seashells.