I need to know what the variable is and please give me the equation. THIS IS TIMED AND I NEED IT FAST I ONLY HAVE A FEW MINUTES!!!

Fiona joins a fruit of the month club. the entry cost was $25 and then she pays $18 per month. if she participates for 8 months, how much will she pay in all? how much in 10 months?

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.