application: Swanky shirt design company charges a $25 set up fee and then $10 a shirt. The function c(t)=10t+25 represents the total cost of an order t = the number of t-shirts and c=total cost. Find c(10)

Really need on these. i have no idea what to do

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.