Which best describes the relationship between the successive terms in the sequence below? –3.2, 4.8, –7.2, 10.8, …

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

I'm confused on this could anyone me and show me what i need to do to solve it.

Given that abcd is a rhombus, what is the value of x?